ORCID Profile
0000-0002-1751-9162
Current Organisation
University of Adelaide
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Publisher: Elsevier BV
Date: 12-2009
DOI: 10.1016/J.BIORTECH.2009.06.070
Abstract: Barley straw, an agricultural waste, was chemically modified and evaluated for the removal of emulsified oils from aqueous solution. The chemical modification was performed using NaOH and a cationic surfactant, hexadecylpyridinium chloride monohydrate (CPC). The surface textural and chemical properties of the surfactant modified barley straw (BMBS) were characterized by N(2) adsorption, FT-IR, SEM and water soluble mineral content. The adsorption tests were carried out in batch adsorption system for removal of standard mineral oil (SMO) and canola oil (CO) from water. For both emulsified oils in wastewater, adsorption was found to be strongly related with solution pH. The isotherm study indicated that emulsified oil adsorption on BMBS could be fitted well with the Langmuir model other than Freundlich model. The maximum adsorption capacity for CO and SMO at 25 degrees C determined from the Langmuir isotherm is 613.3 and 584.2 mg g(-1), respectively. Desorption tests in water solution show that oil is strongly bonded with adsorbent and desorption is only about 1-2% in 24 h.
Publisher: American Chemical Society (ACS)
Date: 15-11-2012
DOI: 10.1021/IE301639T
Publisher: Wiley
Date: 09-2020
Publisher: Wiley
Date: 02-01-2018
Publisher: Elsevier BV
Date: 06-2022
DOI: 10.1016/J.WATRES.2022.118302
Abstract: Electro-peroxone (EP) reaction has been considered as a promising process for real effluent treatments. However, the use of the technology in natural water conditions is limited by low electrical conductivity and high operating costs. Herein, a novel electrochemical system was designed to overcome this constrain by coupling EP with a solid polymer electrolyte (EP-SPE). Performances of EP-SPE system were thoroughly evaluated by comparing the decomposition and energy efficiencies of various plasticizers in different systems. The EP-SPE system achieved 50% of pollutants mineralization in only 10 min with the electrolysis energy consumption of 1.0kWh·m
Publisher: American Chemical Society (ACS)
Date: 12-1997
DOI: 10.1021/IE9703604
Publisher: American Chemical Society (ACS)
Date: 16-08-2005
DOI: 10.1021/JP051787O
Abstract: The nitrogen substitution in carbon materials is investigated theoretically using the density functional theory method. Our calculations show that nitrogen substitution decreases the hydrogen adsorption energy if hydrogen atoms are adsorbed on both nitrogen atoms and the neighboring carbon atoms. On the contrary, the hydrogen adsorption energy can be increased if hydrogen atoms are adsorbed only on the neighboring carbon atoms. The reason can be explained by the electronic structures analysis of N-substituted graphene sheets. Nitrogen substitution reduces the pi electron conjugation and increases the HOMO energy of a graphene sheet, and the nitrogen atom is not stable due to its 3-valent character. This raises an interesting research topic on the optimization of the N-substitution degree, and is important to many applications such as hydrogen storage and the tokamaks device. The electronic structure studies also explain well why nitrogen substitution increases the capacitance but decreases the electron conductivity of carbon electrodes as was experimentally observed in our experiments on the supercapacitor.
Publisher: American Chemical Society (ACS)
Date: 21-08-2023
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 10-2017
Publisher: American Chemical Society (ACS)
Date: 29-05-1999
DOI: 10.1021/IE980489T
Publisher: Elsevier BV
Date: 03-2020
DOI: 10.1016/J.JHAZMAT.2019.121518
Abstract: Research interests have been recently thrust into the nonradical reactions in persulfate-based advanced oxidation processes (AOPs), whilst the underlying mechanism of the nonradical pathway remains ambiguous especially in metal-based AOPs systems. In this study, we investigated the reactivity of cuprous oxide (Cu
Publisher: Elsevier BV
Date: 10-2018
Publisher: American Chemical Society (ACS)
Date: 22-08-2019
Abstract: The maximization of the numbers of exposed active sites in supported metal catalysts is important to achieve high reaction activity. In this work, a simple strategy for anchoring single atom Fe on SBA-15 to expose utmost Fe active sites was proposed. Iron salts were introduced into the as-made SBA-15 containing the template and calcined for simultaneous decomposition of the iron precursor and the template, resulting in single atom Fe sites in the nanopores of SBA-15 catalysts (SAFe-SBA). X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and extended X-ray absorption fine structure (EXAFS) imply the presence of single atom Fe sites. Furthermore, EXAFS analysis suggests the structure of one Fe center with four O atoms, and density functional theory calculations (DFT) simulate this structure. The catalytic performances of SAFe-SBA were evaluated in Fenton-like catalytic oxidation of
Publisher: Wiley
Date: 06-07-2023
Abstract: Industrial and disinfection wastewater typically contains high levels of organic pollutants and residue hydrogen peroxide, which have caused environmental concerns. In this work, dual‐asymmetric MnO 2 @polymer microreactors are synthesized via pollutant polymerization for self‐driven and controlled H 2 O 2 decomposition. A hollow and asymmetric MnO 2 nanotube is derived from MnO 2 nanorods by selective acid etching and then coated by a polymeric layer from an aqueous phenolic pollutant via catalytic peroxymonosulfate (PMS)‐induced polymerization. The evolution of particle‐like polymers is controlled by solution pH, molar ratios of PMS henol, and reaction duration. The polymer‐covered MnO 2 tubing‐structured micromotors presented a controlled motion velocity, due to the reverse torque driven by the O 2 bubbles from H 2 O 2 decomposition in the inner tunnels. In addition, the partially coated polymeric layer can regulate the exposure and population of Mn active sites to control the H 2 O 2 decomposition rate, thus avoiding violent motions and massive heat caused by vigorous H 2 O 2 decomposition. The microreactors can maintain the function of mobility in an ultra‐low H 2 O 2 environment ( .31 wt.%). This work provides a new strategy for the transformation of micropollutants to functional polymer‐based microreactors for safe and controlled hydrogen peroxide decomposition for environmental remediation.
Publisher: American Chemical Society (ACS)
Date: 15-01-2021
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 04-2019
Publisher: Wiley
Date: 10-1999
DOI: 10.1002/(SICI)1097-4660(199910)74:10<988::AID-JCTB140>3.0.CO;2-W
Publisher: Springer Science and Business Media LLC
Date: 17-01-2020
DOI: 10.1007/S40820-019-0358-X
Abstract: Metals and metal oxides are widely used as photo/electro-catalysts for environmental remediation. However, there are many issues related to these metal-based catalysts for practical applications, such as high cost and detrimental environmental impact due to metal leaching. Carbon-based catalysts have the potential to overcome these limitations. In this study, monodisperse nitrogen-doped carbon nanospheres (NCs) were synthesized and loaded onto graphitic carbon nitride (g-C 3 N 4 , GCN) via a facile hydrothermal method for photocatalytic removal of sulfachloropyridazine (SCP). The prepared metal-free GCN-NC exhibited remarkably enhanced efficiency in SCP degradation. The nitrogen content in NC critically influences the physicochemical properties and performances of the resultant hybrids. The optimum nitrogen doping concentration was identified at 6.0 wt%. The SCP removal rates can be improved by a factor of 4.7 and 3.2, under UV and visible lights, by the GCN-NC composite due to the enhanced charge mobility and visible light harvesting. The mechanism of the improved photocatalytic performance and band structure alternation were further investigated by density functional theory (DFT) calculations. The DFT results confirm the high capability of the GCN-NC hybrids to activate the electron–hole pairs by reducing the band gap energy and efficiently separating electron/hole pairs. Superoxide and hydroxyl radicals are subsequently produced, leading to the efficient SCP removal.
Publisher: Wiley
Date: 30-01-2023
DOI: 10.1002/EEM2.12416
Abstract: Solar energy‐induced catalysis has been attracting intensive interests and its quantum efficiencies in plasmon‐mediated photothermal catalysis (P‐photothermal catalysis) and external heat‐coupled photocatalysis (E‐photothermal catalysis) are ultimately determined by the catalyst structure for photo‐induced energetic hot carriers. Herein, different catalysts of supported (TiO 2 ‐P25 and Al 2 O 3 ) platinum quantum dots are employed in photo, thermal, and photothermal catalytic dry reforming of methane. Integrated experimental and computational results unveil different active sites (hot zones) on the two catalysts for photo, thermal, and photothermal catalysis. The hot zones of P‐photothermal catalysis are identified to be the metal–support interface on Pt/P25 and the Pt surface on Pt/Al 2 O 3 , respectively. However, a change of the active site to the Pt surface on Pt/P25 is for the first time observed in E‐photothermal catalysis (external heating temperature of 700 °C). The hot zones contribute to the significant enhancements in photothermal catalytic reactivity against thermocatalysis. This study helps to understand the reaction mechanism of photothermal catalysis to exploit efficient catalysts for solar energy utilization and fossil fuels upgrading.
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 08-2018
DOI: 10.1016/J.IJBIOMAC.2018.04.051
Abstract: In this study, biodegradable κ-carrageenan films containing 3% nanoclay and different amounts of rosemary extract (1, 2 and 3% v/v) were fabricated and their physical, thermal, and mechanical properties, as well as antimicrobial activity were examined. The film thickness did not change significantly by the addition of rosemary extract. UV light transmission value in the control film was 20.46%, while the value for the film with 3% v/v rosmary extract reduced to 0.13%. Elongation at break (EB%) and tensile strength (TS) of the carrageenan film without the extract were 19.07% and 15.96MPa, respectively, while after adding 3% v/v of rosemary extract, the EB and TS were increased to 27.17% and 30.77MPa, respectively. Incorporation of rosemary extract greatly reduced water vapor permeability (WVP) (5.27×10
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 10-2015
DOI: 10.1016/J.JHAZMAT.2015.04.014
Abstract: A series of CoxMn3-xO4 particles as Fenton-like solid catalysts were synthesized, and their catalytic performance in oxidative degradation of organic dye compounds in water was investigated. The surface morphology and structure of the CoxMn3-xO4 catalysts were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results showed that, as an oxide composite of Co and Mn elements, CoMn2O4 showed much stronger catalytic activity in peroxymonosulfate (PMS) oxidation than Co3O4, Mn2O3, and their physical mixture. Typically, the uses of 0.02 g/dm(3) CoMn2O4 and 0.2 g/dm(3) PMS yielded a nearly complete removal of Rhodamine B (0.03 g/dm(3)) in 80 min at 25 °C. The efficiency of Rhodamine B decomposition increased with increasing temperature (15-55 °C), but decreased with the increase of fulvic acid concentration (0-0.08 g/dm(3)). Furthermore, CoMn2O4 could maintain its catalytic activity in the repeated batch experiments. Moreover, HO· and SO4(·-) radicals participating in the process were evidenced using quenching experiments, and a rational mechanism was proposed. PMS oxidation with CoMn2O4 is an efficient technique for remediation of organic contaminants in wastewater.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4TA05940A
Abstract: A mild synthesis method was developed to improve metal-free catalysis of graphene in catalytic oxidation by nitrogen modification, which can be easily tailored by varying calcination temperature.
Publisher: Elsevier BV
Date: 09-2019
Publisher: American Chemical Society (ACS)
Date: 03-11-2020
Publisher: American Chemical Society (ACS)
Date: 15-11-2019
Publisher: Elsevier BV
Date: 10-2011
Publisher: Elsevier BV
Date: 06-2019
DOI: 10.1016/J.JCIS.2019.03.045
Abstract: Perovskite oxides offer new opportunities in wastewater treatment via catalytic oxidation. Herein, we report a new application of perovskite oxides for biological detection via catalytic decolourisation and colorimetric determination. The presence of trace biomolecules in an aqueous system would interfere the decolourisation process of dyes, where the decolourisation rate is quantitatively correlated to the biomolecular concentration. In this work, trace L-cysteine (Cys) detection was demonstrated on the basis of a Ag-Ba
Publisher: Elsevier BV
Date: 10-2019
Publisher: American Chemical Society (ACS)
Date: 11-02-2020
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 25-08-2006
DOI: 10.1016/J.JHAZMAT.2006.01.038
Abstract: An Australian natural zeolite was collected, characterised and employed for basic dye adsorption in aqueous solution. The natural zeolite is mainly composed of clinoptiloite, quartz and mordenite and has cation-exchange capacity of 120 meq/100g. The natural zeolite presents higher adsorption capacity for methylene blue than rhodamine B with the maximal adsorption capacity of 2.8 x 10(-5) and 7.9 x 10(-5)mol/g at 50 degrees C for rhodamine B and methylene blue, respectively. Kinetic studies indicated that the adsorption followed the pseudo second-order kinetics and could be described as two-stage diffusion process. The adsorption isotherm could be fitted by the Langmuir and Freundlich models. Thermodynamic calculations showed that the adsorption is endothermic process with Delta H(0) at 2.0 and 8.7 kJ/mol for rhodamine B and methylene blue. It has also found that the regenerated zeolites by high-temperature calcination and Fenton oxidation showed similar adsorption capacity but lower than the fresh s le. Only 60% capacity could be recovered by the two regeneration techniques.
Publisher: Springer Science and Business Media LLC
Date: 27-04-2013
DOI: 10.1007/S12035-013-8452-4
Abstract: Flotillins are membrane association proteins consisting of two homologous members, flotillin-1 (Flot-1) and flotillin-2 (Flot-2). They define a clathrin-independent endocytic pathway in mammal cells, which are also distinct from some other endocytosis mechanisms. The implicated cargoes of the flotillin-dependent pathway are mainly some GPI-anchored proteins, such as CD59 and Thy-1, which positionally colocalize with flotillins at the plasma membrane microdomains. To see whether flotillins are involved in the endocytosis of PrP(C), the potential molecular interaction between PrP(C) and flotillins in a neuroblastoma cell line SK-N-SH was analyzed. Co-immunoprecipitation assays did not reveal a detectable complex in the cell lysates of a normal feeding situation. After stimulation of Cu(2+), PrP(C) formed a clear complex with Flot-1, but not with Flot-2. Immunofluorescent assays illustrated that PrP(C) colocalized well with Flot-1, and the complexes of PrP(C)-Flot-1 shifted from the cell membrane to the cytoplasm along with the treatment of Cu(2+). Down-regulating the expression of Flot-1 in SK-N-SH cells by Flot-1-specific RNAi obviously abolished the Cu(2+)-stimulated endocytosis process of PrP(C). Moreover, we also found that in the cell line human embryonic kidney 293 (HEK293) without detectable PrP(C) expression, the distribution of cellular Flot-1 maintained almost unchanged during Cu(2+) treatment. Cu(2+)-induced PrP(C)-Flot-1 molecular interaction and endocytosis in HEK293 cells were obtained when expressing wild-type human PrP (PrP(PG5)), but not in the preparation expressing octarepeat-deleted PrP (PrP(PG0)). Our data here provide direct evidences for the molecular interaction and endocytosis of PrP(C) with Flot-1 in the presence of copper ions, and the octarepeat region of PrP(C) is critical for this process, which strongly indicates that the Flot-1-dependent endocytic pathway seems to mediate the endocytosis process of PrP(C) in the special situation.
Publisher: American Chemical Society (ACS)
Date: 22-11-2013
DOI: 10.1021/IE401690H
Publisher: Elsevier BV
Date: 10-2020
Publisher: American Chemical Society (ACS)
Date: 03-02-2023
Publisher: Elsevier
Date: 2000
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 12-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2RA20346D
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 07-2011
Publisher: Elsevier BV
Date: 07-2014
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 12-2019
DOI: 10.1016/J.WATRES.2019.115110
Abstract: Membrane separation and advanced oxidation processes (AOPs) have been respectively demonstrated to be effective for a variety of water and/or wastewater treatments. Innovative integration of membrane with catalytic oxidation is thus expected to be more competing for more versatile applications. In this study, ceramic membranes (CMs) integrated with manganese oxide (MnO
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 08-2008
Publisher: Elsevier BV
Date: 09-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA04975A
Abstract: Thiophene ring implanted two-dimensional carbon nitride nanosheets (2D Th ing -CNNS) with dramatically double elevated n → π* electronic transitions were synthesized. 2D Th ing -CNNS exhibited efficient photocatalytic bisphenol-A degradation.
Publisher: Elsevier BV
Date: 03-2020
DOI: 10.1016/J.JCIS.2019.11.094
Abstract: The photocatalytic degradation of carbamazepine (CBZ) in ultra-pure water was investigated by using neodymium (Nd)-doped antimony trioxide (Sb
Publisher: Elsevier BV
Date: 10-2020
Publisher: Wiley
Date: 27-07-2017
Publisher: Elsevier BV
Date: 2016
Publisher: American Chemical Society (ACS)
Date: 20-12-2011
DOI: 10.1021/JE101049G
Publisher: Elsevier BV
Date: 12-2017
DOI: 10.1016/J.JCIS.2017.08.086
Abstract: A glassy carbon electrode (GCE) modified by calixarene functionalized reduced graphene oxide (CA/RGO) has been fabricated and utilized in this study for simultaneous voltammetric detection of several metal ions, Fe(II), Cd(II) and Pb(II), in aqueous solution. The CA/RGO nanocomposite was characterized in surface and electrochemical properties using scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), Raman spectroscopy and electrochemical impedance spectroscopy (EIS). The CA/RGO coating significantly improves the sensitivity of electrochemical responses and separation of heavy metals. The electrochemical oxidation of Fe(III), Cd(II), and Pb(II) was performed by square wave voltammetry (SWV). The metal ions, Fe(III), Cd(II), and Pb(II), gave a linear relationship with their concentrations at 1.0×10
Publisher: Elsevier BV
Date: 05-2020
DOI: 10.1016/J.JHAZMAT.2019.121881
Abstract: The biomass, bottlebrush flower, is exploited for the preparation of functionalized porous carbons by one-pot thermal activation using NaHCO
Publisher: Elsevier BV
Date: 09-2020
Publisher: Wiley
Date: 09-2008
DOI: 10.1002/APJ.174
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9GC01728C
Abstract: This review summarizes the state-of-the-art accomplishments in photocatalytic conversion of lignocellulosic biomass and its derivatives.
Publisher: Springer Science and Business Media LLC
Date: 27-04-2013
DOI: 10.1007/S12035-013-8455-1
Abstract: Polo-like kinases (PLKs) consist of a family of kinases which play critical roles during multiple stages of cell cycle progression. Increase of PLK1 and decrease of PLK3 are associated with the developments and metastases of many types of human malignant tumors however, the situations of PLKs in prion diseases are less understood. Using Western blots and immunohistochemical and immunofluorescent assays, marked increase of PLK1 and decrease of PLK3 were observed in the brains of scrapie strain 263K-infected hamsters, presenting obviously a time-dependent phenomenon along with disease progression. Similar alterations of PLKs were also detected in a scrapie infectious cell line SMB-S15. Both PLK1 and PLK3 were observed in neurons by confocal microscopy. Accompanying with the changes of PLKs in the brains of 263K-infected hamsters, Cdc25C and its phosphorylated forms (p-Cdc25C-Ser198 and p-Cdc25C-Ser216) were significantly down-regulated, whereas Cyclin B1 and PCNA were obviously up-regulated, while phospho-histone H3 remained almost unchanged. Moreover, exposure of the cytotoxic peptide PrP106-126 on the primary cultured cortical neuron cells induced similar changes of cellular PLKs and some cell cycle-related proteins, such as Cdc25C and its phosphorylated forms, phospho-histone H3. Those results illustrate obviously aberrant expressions of cell cycle regulatory proteins in the prion-infected neurons, which may lead to the cell cycle arrest at M phase. Possibly due to the ill-regulation of some key cell cycle events during prion infection, together with the fact that neurons are unable to complete mitosis, the cell cycle reentry in prion-infected neurons is definitely abortive, which may lead to neuron apoptosis and neuron degeneration.
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 03-2013
DOI: 10.1016/J.JCIS.2012.11.017
Abstract: Cobalt oxides (Co) and Al(2)O(3)-, SiO(2)-, and TiO(2)-supported cobalt oxide catalysts were prepared by an aqueous combustion method using urea and glycine as fuels. Their catalytic performance in activation of OXONE® for phenol degradation in aqueous solution was investigated. It was found that unsupported Co oxide and supported Co oxide presented different mechanisms in activation of OXONE® for phenol degradation. The supported Co catalysts presented higher activity in activation of OXONE® for phenol degradation due to higher dispersion of Co(3)O(4) on the supports and Co(II) coordination sites. The major oxidizing radicals were identified to be SO(4)(-) by competitive radical reactions. The Co oxides synthesized from urea or glycine showed a similar activity however, the supported Co catalysts prepared by glycine fuel exhibited better activity than those prepared by urea. For Al(2)O(3)-, SiO(2)-, and TiO(2)-supported Co catalysts, Co/TiO(2) presented a higher activity in phenol degradation compared with Co/SiO(2) and Co/Al(2)O(3). But, Co/SiO(2) showed the best stability among the catalysts. Total organic carbon could be reduced by 80%, 72%, and 45% on Co/TiO(2), Co/SiO(2), and Co/Al(2)O(3), respectively, at 30 ppm phenol. Phenol degradation was found to follow the zero-order kinetics. The causes of deactivation were investigated, and the regeneration methods were proposed.
Publisher: Wiley
Date: 19-06-2021
Abstract: The immobilization of natural photosystem II (PSII) enzyme onto an artificial electrode offers an ingenious and promising avenue for semiartificial solar energy conversion. However, this process is significantly limited by the poor stability and the short life of PSII. Here, a new prototype of a semiartificial system is reported by anchoring PSII on polyethylenimine‐coated macroporous carbon electrode with a high load. Good electronic communication is established at the biointerface of this PSII electrode, enabling excellent photoelectrochemical (PEC) water oxidation and lasting electricity generation. The maximum turnover number of 10 200 ± 1380 mol O 2 per mol PSII dimer is obtained in this system at around 10 h before complete deactivation, reaching high current‐to‐O 2 conversion efficiencies. The functions of PSII to release O 2 both in light and dark conditions as well as for H 2 O 2 formation are revealed. Under periodic irradiation (AM 1.5G 1 sun), this PSII electrode allows for stable mediated photocurrent output of ≈4.31 µA cm −2 after five days, which represents the most stable photoelectric performance achieved so far for PSII‐related electrodes.
Publisher: Elsevier BV
Date: 07-2014
Publisher: Wiley
Date: 29-07-2008
DOI: 10.1002/APJ.172
Publisher: American Chemical Society (ACS)
Date: 16-10-2023
Publisher: American Chemical Society (ACS)
Date: 25-07-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EN00505C
Abstract: Fenton-like degradation of p -hydroxybenzoic acid by ultrafine copper nanoclusters and single sites exhibited high atom utilities and a wide working pH range.
Publisher: American Chemical Society (ACS)
Date: 10-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CY01131H
Abstract: Singlet oxygen has been identified as a contributor to the degradation of contaminants using biosynthesised hollow Ag@AgBr catalysts.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC01548A
Abstract: New FeO x –MnO 2 catalytic micromotors were developed with high speeds at extremely low H 2 O 2 fuel concentrations.
Publisher: American Chemical Society (ACS)
Date: 16-01-1998
DOI: 10.1021/EF970092M
Publisher: American Chemical Society (ACS)
Date: 06-2019
Publisher: Wiley
Date: 25-06-2018
DOI: 10.1002/AIC.16332
Publisher: American Chemical Society (ACS)
Date: 11-10-2021
Abstract: Graphitized nanodiamonds (ND) exhibit outstanding capability in activating peroxymonosulfate (PMS) for the removal of aqueous organic micropollutants (OMPs). However, controversial observation and interpretation regarding the effect of graphitization degree on ND's activity and the role of singlet oxygen (
Publisher: American Chemical Society (ACS)
Date: 11-04-2007
DOI: 10.1021/ES062326Z
Abstract: Industrial solid wastes (fly ash and red mud) have been employed as supports for preparation of Ru-based catalysts. Physical and chemical treatments on red mud were conducted and these modified supports were also used for preparation of Ru-based catalysts. Those Ru catalysts were characterized by various techniques such as N2 adsorption, H2 adsorption, XRD, XPS, and temperature-programmed reduction (TPR), and were then tested for catalytic ammonia decomposition to hydrogen. It was found that red-mud-supported Ru catalyst exhibits higher ammonia conversion and hydrogen production than fly-ash-supported catalyst. Heat and chemical treatments of the red mud greatly improve the catalytic activity. Moreover, a combination of acid and heat treatments produces the highest catalytic conversion of ammonia.
Publisher: American Chemical Society (ACS)
Date: 26-05-2020
Publisher: Elsevier BV
Date: 03-2012
Publisher: American Chemical Society (ACS)
Date: 19-07-2016
Publisher: Elsevier BV
Date: 25-08-2006
DOI: 10.1016/J.JHAZMAT.2006.01.067
Abstract: Fly ash is a waste substance from thermal power plants, steel mills, etc. that is found in abundance in the world. In recent years, utilisation of fly ash has gained much attention in public and industry, which will help reduce the environmental burden and enhance economic benefit. In this paper, the technical feasibility of utilisation of fly ash as a low-cost adsorbent for various adsorption processes for removal of pollutants in air and water systems has been reviewed. Instead of using commercial activated carbon or zeolites, a lot of researches have been conducted using fly ash for adsorption of NO(x), SO(x), organic compounds, and mercury in air, and cations, anions, dyes and other organic matters in waters. It is recognised that fly ash is a promising adsorbent for removal of various pollutants. Chemical treatment of fly ash will make conversion of fly ash into a more efficient adsorbent for gas and water cleaning. Investigations also revealed that unburned carbon component in fly ash plays an important role in adsorption capacity. Directions for future research are also discussed.
Publisher: Elsevier BV
Date: 10-2017
Publisher: American Chemical Society (ACS)
Date: 03-11-2020
Publisher: American Chemical Society (ACS)
Date: 09-2016
Abstract: A strong solid acid, tungstated zirconia (WZ), has been prepared first using tungstate immobilized UiO-66 as precursors through a "double-solvent" impregnation method under mild calcination temperature. With moderate W contents, the as-synthesized WZ catalysts possess a high density of acid sites, and the proper heat treatment also has facilely led to a bunch of oligomeric tungsten clusters on stabilized tetragonal ZrO2. The resultant solid acids show an improved catalytic performance toward the benzaldehyde's acetalization in comparison with traditional zirconium hydroxide-prepared WZ. Notably, due to large surface area and additionally introduced strong acid sites, the MOF-derived WZ catalysts afforded conversion up to 86.0%. The facile method endows the WZ catalysts with superior catalytic activities and excellent recyclability, thus opening a new avenue for preparation of metal oxide-based solid superacids and superbases.
Publisher: Elsevier BV
Date: 03-2018
Publisher: American Chemical Society (ACS)
Date: 18-11-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9EN00638A
Abstract: 3D graphene-based macrostructures have been recognized as promising candidates for adsorption and separation of water pollutants due to their well-defined porous structures and high surface areas.
Publisher: American Chemical Society (ACS)
Date: 25-04-2012
DOI: 10.1021/JE3001552
Publisher: American Chemical Society (ACS)
Date: 08-04-2015
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 06-2014
Publisher: Wiley
Date: 24-02-2020
Publisher: Wiley
Date: 08-09-2020
Publisher: Wiley
Date: 03-12-2019
Abstract: Low-cost, nonprecious transition metal (TM) catalysts toward efficient water oxidation are of critical importance to future sustainable energy technologies. The advances in structure engineering of water oxidation catalysts (WOCs) with single TM centers as active sites, for ex le, single metallic molecular complexes (SMMCs), supported SMMCs, and single-atom catalysts (SACs) in recent reports are examined. The efforts made on these configurations in terms of design principle, advanced characterization, performances and theoretical studies, are critically reviewed. A clear roadmap with the correlations between the single-TM-site-based structures (coordination and geometric structure, TM species, support), and the catalytic performances in water oxidation is provided. The insights bridging SMMCs with SACs are also given. Finally, the challenges and opportunities in the single-TM-site catalysis are proposed.
Publisher: Elsevier BV
Date: 02-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3NR04282K
Abstract: Physical and chemical activation of reduced graphene oxide (RGO) using different reagents, CO2, ZnCl2 and CO2/ZnCl2, to obtain highly porous and metal-free carbonaceous materials was carried out and their adsorption and catalytic behavior were investigated. Physical activation using CO2 was proved to be much more effective than chemical ZnCl2 activation, and increased the specific surface area (SSA) of RGO from ~200 to higher than 600 m(2) g(-1). Methylene blue (MB) was then used to evaluate the adsorption and catalytic activity of the activated RGO (A-RGO) materials with peroxymonosulfate (PMS) as an oxidant. It was found that the SSA and oxygen containing groups are two important factors determining the adsorptive and catalytic performance of the A-RGO materials. RGO by physicochemical CO2/ZnCl2 activation presented the best adsorption and RGO by physical CO2 activation exhibited the highest catalytic degradation of MB.
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 12-2019
DOI: 10.1016/J.WATRES.2019.115043
Abstract: Multi-walled carbon nanotubes (MWCNTs) eroxydisulfate (PDS) is a green oxidative system for abatement of aqueous organic pollutants, while the powder form and poor cycling performance of the catalyst limit its practical application. To solve these problems, fabricating a MWCNT cathode (negative polarization) to coupling carbocatalysis-driven PDS activation with electrosorption of organic pollutant was previously demonstrated to be a possible solution to these problems. To further improve the activation efficiency of PDS, positive polarization of MWCNT electrode (anode) was adapted to activate PDS for removing acyclovir and phenol in this work. Under a working voltage of 1.2 V, the MWCNT anode was more efficient than the MWCNT cathode and the non-polarized MWCNT electrode for PDS activation and removal of organic pollutants, owing to the enhanced attraction between S
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 12-2015
Publisher: Wiley
Date: 12-2000
DOI: 10.1002/1521-4125(200012)23:12<1099::AID-CEAT1099>3.0.CO;2-W
Publisher: Elsevier BV
Date: 15-01-2010
Publisher: Elsevier BV
Date: 2007
Publisher: American Chemical Society (ACS)
Date: 07-07-2015
Publisher: Springer Science and Business Media LLC
Date: 06-12-2016
DOI: 10.1038/SREP38520
Abstract: Stability and reusability are important characteristics of advanced catalysts for wastewater treatment. In this work, for the first time, sulfate radicals (SO 4 ∙ − ) with a high oxidative potential (E o = 2.5–3.1 V) were successfully activated from persulfate by a Fe 78 Si 9 B 13 metallic glass. This alloy exhibited a superior surface stability and reusability while activating persulfate as indicated by it being used for 30 times while maintaining an acceptable methylene blue (MB) degradation rate. The produced SiO 2 layer on the ribbon surface expanded strongly from the fresh use to the 20 th use, providing stable protection of the buried Fe. MB degradation and kinetic study revealed 100% of the dye degradation with a kinetic rate k = 0.640 within 20 min under rational parameter control. The dominant reactive species for dye molecule decomposition in the first 10 min of the reaction was hydroxyl radicals (∙OH, E o = 2.7 V) and in the last 10 min was sulfate radicals (SO 4 ∙ − ), respectively. Empirical operating variables for dye degradation in this work were under catalyst dosage 0.5 g/L, light irradiation 7.7 μW/cm 2 , and persulfate concentration 1.0 mmol/L. The amorphous Fe 78 Si 9 B 13 alloy in this work will open a new gate for wastewater remediation.
Publisher: Elsevier BV
Date: 11-2018
DOI: 10.1016/J.JCIS.2018.07.010
Abstract: Unreliable energy supply and environmental pollution are two major concerns of the human society in this century. Herein, we report a rational approach on preparation of hierarchically-structured cobalt-carbon composites with tunable properties for a number of applications. A facile hydrothermal treatment of cobalt nitrate and sucrose results in the formation of a metallic cobalt-amorphous carbon composite with cobalt nanospheres anchored homogenously on an amorphous carbon substrate. Tuning the calcination conditions in air will generate either a metallic cobalt-cobalt oxide core-shell structure with magnetism or a fully oxidized Co
Publisher: Elsevier BV
Date: 12-2018
DOI: 10.1016/J.JCIS.2018.07.131
Abstract: Photocatalysis has been believed as one of the green and sustainable avenues to address energy and environmental crises by converting solar energy to chemical energy via reactions. Temperature is usually a vital factor controlling kinetics and thermodynamics of a reaction, but it has been less investigated in photocatalysis. In this work, the effect of reaction temperature on photocatalysis was investigated in a simple process, photocatalytic degradation of Congo Red (CR) on three typical catalysts, g-C
Publisher: Elsevier BV
Date: 10-2020
Publisher: Public Library of Science (PLoS)
Date: 07-06-2012
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 07-2015
Publisher: Springer Science and Business Media LLC
Date: 20-11-2013
Publisher: Elsevier BV
Date: 07-2017
DOI: 10.1016/J.ULTSONCH.2016.11.025
Abstract: In this work, ultrasound-assisted adsorption of an anionic dye, sunset yellow (SY) and cationic dyes, malachite green (MG), methylene blue (MB) and their ternary dye solutions onto Cu@ Mn-ZnS-NPs-AC from water aqueous was optimized by response surface methodology (RSM) using the central composite design (CCD). The adsorbent was characterized using Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX) and EDX mapping images. The effects of various parameters such as pH, sonication time, adsorbent mass and initial concentrations of SY, MG and MB were examined. A total 33 experiments were conducted to establish a quadratic model. Cu@ Mn-ZnS-NPs-AC has the maximum adsorption efficiency (>99.5%) when the pH, sonication time, adsorbent mass and initial concentrations of SY, MG and MB were optimally set as 6.0, 5min, 0.02g, 9, 12 and 12mgL
Publisher: Springer Science and Business Media LLC
Date: 07-1999
DOI: 10.1007/BF02475763
Publisher: Elsevier BV
Date: 04-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9EN90046B
Abstract: Correction for ‘MXene as a non-metal charge mediator in 2D layered CdS@Ti 3 C 2 @TiO 2 composites with superior Z-scheme visible light-driven photocatalytic activity’ by Qiaoran Liu et al. , Environ. Sci.: Nano , 2019, DOI: 10.1039/c9en00567f.
Publisher: Elsevier BV
Date: 07-2017
Publisher: American Chemical Society (ACS)
Date: 26-02-2013
DOI: 10.1021/IE303220X
Publisher: Elsevier BV
Date: 11-2005
DOI: 10.1016/J.JHAZMAT.2005.06.009
Abstract: Fly ash s les modified by NaOH solution and sonochemical treatment were tested for a basic dye (methylene blue) adsorption in aqueous solution. It is found that sonochemical treatment of fly ash can significantly increase the adsorption capacity depending on the concentration of NaOH and treatment time. The untreated FA and the sonochemically treated s le exhibits adsorption capacity at 6 x 10(-6)mol/g and 1.2 x 10(-5)mol/g at 30 degrees C, respectively. The adsorption tests show that solution pH and adsorption temperature also influence the adsorption behaviour. The adsorption isotherms can be fitted by Langmuir and Freudlich models, while the two-site Langmuir heterogeneous model will present the best result.
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 12-2014
DOI: 10.1016/J.ENZMICTEC.2014.09.003
Abstract: Microbial nano-synthesis has been well established as a green method for the sustainable development of nanotechnology. However, the mechanism of this biotechnology has to be reconsidered with the increasing realization that microorganism culture broth plays a vital role during the synthesis, which may obviate the dependence on microbes. Here, we demonstrate that silver nanoparticles (AgNPs) could be synthesized in several types of microorganism culture broth (an aqueous solution abundant in peptone, yeast extract from Saccharomyces cerevisiae, dextrose and other reducing and stabilizing agents) without any specific living microbe involvement. Light and high pH values of broth were identified as two critical factors in ensuring pure AgNPs formation. In broths containing NaCl at high concentration (0.5wt%), silver chloride was identified as the major intermediate and could be converted to AgNPs via one-pot photoreduction. Our broth alone strategy dramatically simplifies the conventional microbial nano-synthesis process by cutting the use of microorganisms and thus provides a more eco-friendly way for nano-Ag preparation. The fundamental understanding of the microbial synthesis mechanisms and implementing of complete green methods to fabricate technologically important nanomaterials will be further promoted by this study.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CY01195K
Abstract: This review provides a comprehensive survey and critical comments on the development of photocatalysts with a focus on the metal-free materials.
Publisher: Informa UK Limited
Date: 09-2017
DOI: 10.2147/DDDT.S145716
Publisher: Springer Science and Business Media LLC
Date: 02-01-2020
Publisher: American Chemical Society (ACS)
Date: 16-10-2023
Publisher: Elsevier BV
Date: 05-2012
Publisher: Elsevier BV
Date: 05-2020
DOI: 10.1016/J.JHAZMAT.2019.121844
Abstract: Nonprecious bimetallic molybdenum and iron embedded into N-doped carbon (MoFe-NC) hybrids were designed and fabricated by pyrolysis of mixed precursors and then immobilized on poly (vinylidene fluoride) (PVDF) films via a phase inversion process to obtain novel catalytic membranes (MoFe-NC@PVDF) for toxic Cr
Publisher: Elsevier BV
Date: 11-2019
DOI: 10.1016/J.JCIS.2019.08.008
Abstract: In this work, 2D/2D tungsten trioxide (WO
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 08-2010
Publisher: Elsevier BV
Date: 08-2020
Publisher: Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau
Date: 19-11-2020
Abstract: In this study, three improved versions of UiO-66 metal organic frameworks (MOFs) were synthesised successfully: Different ratios of Ca+2/Zr+4 were used to synthesise UiO-66, UiO-66-10%Ca and UiO-66-30%Ca. Batch adsorption experiments were achieved to remove MB from wastewater by UiO-66-Ca. UiO-66-10%Ca exhibited the highest adsorption capacity with maximum MB adsorption capacity of 15 mg. g–1 in UiO-66-30%Ca while UiO-66 demonstrated lower MB loading. Langmuir and Freundlich models have been employed to describe isotherms. A kinetics study indicated pseudo first-order and pseudo second-order equations. In addition, an intraparticle diffusion model was utilised. The results presented here may facilitate the further enhancement of UiO-66 MOFs and advance the synthesis of multimetal MOFs in future research.
Publisher: Elsevier BV
Date: 20-10-2010
Publisher: Elsevier BV
Date: 09-2019
Publisher: Springer Science and Business Media LLC
Date: 11-1999
DOI: 10.1007/BF02475511
Publisher: Wiley
Date: 19-07-2017
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3YA00315A
Publisher: Elsevier BV
Date: 10-2019
DOI: 10.1016/J.ENVINT.2019.104977
Abstract: Oxygen (O
Publisher: American Chemical Society (ACS)
Date: 11-02-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3RA42519C
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier
Date: 2007
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.ENVINT.2019.04.006
Abstract: Iron nanoparticles encapsulated within boron and nitrogen co-doped carbon nanoshell (B/N-C@Fe) were synthesized through a novel and green pyrolysis process using melamine, boric acid, and ferric nitrate as the precursors. The surface morphology, structure, and composition of the B/N-C@Fe materials were thoroughly investigated. The materials were employed as novel catalysts for the activation of potassium monopersulfate triple salt (PMS) for the degradation of levofloxacin (LFX). Linear sweep voltammograms and quenching experiments were used to identify the mechanisms of PMS activation and LFX oxidation by B/N-C@Fe, where SO
Publisher: American Chemical Society (ACS)
Date: 29-06-2012
DOI: 10.1021/IE200544Z
Publisher: American Chemical Society (ACS)
Date: 05-11-2012
DOI: 10.1021/AM301829U
Abstract: Nanoscaled zerovalent iron (ZVI) encapsulated in carbon spheres (nano-Fe⁰@CS) were prepared via a hydrothermal carbonization method, using glucose and iron(III) nitrate as precursors. The properties of the nano-Fe⁰@CS were investigated by X-ray diffraction (XRD), thermogravimetric analysis-differential scanning calorimetry (TGA-DSC), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen adsorption/desorption isotherms. Nano-Fe⁰@CS was demonstrated, for the first time, as an effective material in activating Oxone (peroxymonosulfate, PMS) for the oxidation of organic pollutants. It was found that the efficiency of nano-Fe⁰@CS was higher than ZVI particles, iron ions, iron oxides, and a cobalt oxide. The mechanism of the high performance was discussed. The structure of the nano-Fe⁰@CS not only leads to high efficiency in the activation of PMS, but also good stability. This study extended the application of ZVI from reductive destruction of organics to oxidative degradation of organics by providing a green material for environmental remediation.
Publisher: American Chemical Society (ACS)
Date: 10-06-2000
DOI: 10.1021/EF990247L
Publisher: Elsevier BV
Date: 12-2019
Publisher: Wiley
Date: 20-01-2020
Abstract: The structure-property engineering of phase-based materials for redox-reactive energy conversion and environmental decontamination nanosystems, which are crucial for achieving feasible and sustainable energy and environment treatment technology, is discussed. An exhaustive overview of redox reaction processes, including electrocatalysis, photocatalysis, and photoelectrocatalysis, is given. Through ex les of applications of these redox reactions, how structural phase engineering (SPE) strategies can influence the catalytic activity, selectivity, and stability is constructively reviewed and discussed. As observed, to date, much progress has been made in SPE to improve catalytic redox reactions. However, a number of highly intriguing, unresolved issues remain to be discussed, including solar photon-to-exciton conversion efficiency, exciton dissociation into active reductive/oxidative electrons/holes, dual- and multiphase junctions, selective adsorption/desorption, performance stability, sustainability, etc. To conclude, key challenges and prospects with SPE-assisted redox reaction systems are highlighted, where further development for the advanced engineering of phase-based materials will accelerate the sustainable (active, reliable, and scalable) production of valuable chemicals and energy, as well as facilitate environmental treatment.
Publisher: Elsevier BV
Date: 09-2019
Publisher: MDPI AG
Date: 26-12-2017
DOI: 10.3390/CATAL7010003
Publisher: American Chemical Society (ACS)
Date: 18-09-2012
DOI: 10.1021/AM301372D
Abstract: We discovered that chemically reduced graphene oxide, with an I(D)/I(G) >1.4 (defective to graphite) can effectively activate peroxymonosulfate (PMS) to produce active sulfate radicals. The produced sulfate radicals (SO(4)(•-)) are powerful oxidizing species with a high oxidative potential (2.5-3.1 vs 2.7 V of hydroxyl radicals), and can effectively decompose various aqueous contaminants. Graphene demonstrated a higher activity than several carbon allotropes, such as activated carbon (AC), graphite powder (GP), graphene oxide (GO), and multiwall carbon nanotube (MWCNT). Kinetic study of graphene catalyzed activation of PMS was carried out. It was shown that graphene catalysis is superior to that on transition metal oxide (Co(3)O(4)) in degradation of phenol, 2,4-dichlorophenol (DCP) and a dye (methylene blue, MB) in water, therefore providing a novel strategy for environmental remediation.
Publisher: Royal Society of Chemistry (RSC)
Date: 16-09-2014
DOI: 10.1039/C4CC05544F
Abstract: Here we report a low-cost and facile synthesis approach for carbon-doped mesoporous anatase TiO2 by using Ti(BuO)4 as a source for both Ti and carbon through xerogel carbonization in a hypoxic atmosphere. The resultant mesoporous C-TiO2 with high crystallinity exhibits excellent photocatalytic activities for degradation of methyl orange (MO) and phenol under visible light irradiation.
Publisher: American Chemical Society (ACS)
Date: 20-07-2023
Publisher: Elsevier BV
Date: 03-2009
Publisher: MDPI AG
Date: 16-08-2017
DOI: 10.3390/CATAL7080236
Abstract: The intensive human activities in chemical industry and environmental purification urge the development of advanced protocols for green production and waste management. [...]
Publisher: American Chemical Society (ACS)
Date: 09-03-2016
Abstract: Heteroatom (nitrogen and sulfur)-codoped porous carbons (N-S-PCs) with high surface areas and hierarchically porous structures were successfully synthesized via direct pyrolysis of a mixture of glucose, sodium bicarbonate, and thiourea. The resulting N-S-PCs exhibit excellent adsorption abilities and are highly efficient for potassium persulfate activation when employed as catalysts for the oxidative degradation of sulfachloropyridazine (SCP) solutions. The adsorption capacities of N-S-PC-2 (which contains 4.51 atom % nitrogen and 0.22 atom % sulfur and exhibits SBET of 1608 m(2) g(-1)) are 73, 7, and 3 times higher than those of graphene oxide, reduced graphene oxide, and commercial single-walled carbon nanotube, respectively. For oxidation, the reaction rate constant of N-S-PC-2 is 0.28 min(-1). This approach not only contributes to the large-scale production and application of high-quality catalysts in water remediation but also provides an innovative strategy for the production of heteroatom-doped PCs for energy applications.
Publisher: Springer Science and Business Media LLC
Date: 16-04-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9EN01250H
Abstract: Manganese oxides, with low toxicity and wide adaptability, have been demonstrated as promising catalysts for substituting noble metals/oxides in a ersity of chemical reactions.
Publisher: Elsevier BV
Date: 02-2011
Publisher: Wiley
Date: 08-06-2022
DOI: 10.1111/ANS.17830
Abstract: The technical difficulty an operation creates for a surgeon is difficult to measure. Current measures are poor surrogates. In both research and teaching settings it would be valuable to be able to accurately measure this degree of difficulty. The National Aeronautics and Space Administration Task Load Index (NASA TLX) is a multi-dimensional scale designed to obtain workload estimates relating to a task. This study aimed to evaluate the NASA TLX as an objective measure of technical difficulty of an operation. Seven surgeons performed 127 pre-defined operations (minimally invasive right hemicolectomy & re-do bariatric surgery) and recorded a NASA TLX score after each operation. These scores were compared to numerous clinical parameters and the score was correlated with the subjective measure of whether the surgeon categorized the operation as "easy", "moderate" or "difficult". The NASA TLX score was significantly correlated with operative duration, blood loss, previous abdominal surgery and the surgeons' assessment of difficulty. It did not correlate with intra-operative or post-operative complications, conversion to open surgery or length of stay. The NASA TLX score provides a graded numerical score that that correlated significantly with the surgeon's assessment of the technical difficulty, and with operative duration, intra-operative blood loss and previous abdominal surgery. This novel application of this tool could be employed in both research and teaching settings to score surgical difficulty and monitor a trainee's proficiency over time.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 03-2001
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 12-2005
DOI: 10.1016/J.JCIS.2005.06.014
Abstract: Fly ash, natural zeolite, and unburned carbon separated from fly ash have been employed as low-cost adsorbents for dye adsorption in methylene blue-containing wastewater. It is found that the unburned carbon exhibits a much higher adsorption capacity than raw fly ash and natural zeolite. The adsorption capacities of fly ash, natural zeolite, and unburned carbon for methylene blue are 2 x 10(-5), 5 x 10(-5), and 2.5 x 10(-4) mol/g, respectively. Investigation also indicates that adsorption is influenced by initial dye concentration, particle size, dye solution pH, and adsorption temperature. Adsorption on unburned carbon increases with the initial dye concentration, solution pH, and temperature, but reduces with the increasing particle size. Kinetic studies show that adsorption of methylene blue on fly ash, natural zeolite, and unburned carbon can be best described by the pseudo-second-order adsorption model and that adsorption is a two-step diffusion process. The apparent activation energies for methylene blue adsorption on unburned carbon in the first and second diffusion processes are 12.4 and 39.3 kJ/mol, respectively.
Publisher: Elsevier BV
Date: 11-2003
Publisher: American Chemical Society (ACS)
Date: 27-03-2017
Abstract: A novel shape controlled Cu
Publisher: American Chemical Society (ACS)
Date: 03-2018
DOI: 10.1021/ACS.ACCOUNTS.7B00535
Abstract: Catalytic processes have remarkably boosted the rapid industrializations in chemical production, energy conversion, and environmental remediation. As one of the emerging applications of carbocatalysis, metal-free nanocarbons have demonstrated promise as catalysts for green remediation technologies to overcome the poor stability and undesirable metal leaching in metal-based advanced oxidation processes (AOPs). Since our reports of heterogeneous activation of persulfates with low-dimensional nanocarbons, the novel oxidative system has raised tremendous interest for degradation of organic contaminants in wastewater without secondary contamination. In this Account, we showcase our recent contributions to metal-free catalysis in advanced oxidation, including design of nanocarbon catalysts, exploration of intrinsic active sites, and identification of reactive species and reaction pathways, and we offer perspectives on carbocatalysis for future environmental applications. The journey starts with the discovery of peroxymonosulfate (PMS) and peroxydisulfate (PDS) activation by graphene-based materials. With the systematic investigations on most carbon allotropes, for the first time the carbocatalysis for PMS or PDS activation was correlated with the pristine carbon configuration, oxygen functionality (ketonic groups), defect degree (exposed edge sites and vacancies), and dimensional structure. Moreover, an intrinsic difference in catalytic oxidation does exist between PMS and PDS activation. For ex le, the PMS/carbon reaction is dominated by free radicals, while PDS/carbon catalysis was unveiled as a singlet oxygen- or nonradical-based process in which the surface-activated PDS complex directly degrades the organic pollutants without relying on the generation of free radicals. Nitrogen doping significantly enhances the carbocatalysis because of the positively charged carbon domains, which strongly bind with persulfates to form reactive intermediates toward organic reactions. More importantly, N doping substantially alters the catalytic oxidation from a radical process to a nonradical pathway in PMS activation. Codoping of sulfur or boron with nitrogen at a rational level will synergistically promote the catalysis as a result of the formation of more catalytic centers by improved charge/spin redistribution of the carbon framework. Furthermore, a structure-performance relationship was established for annealed nanodiamonds with a characteristic sp
Publisher: American Chemical Society (ACS)
Date: 15-12-2016
Abstract: Direct water oxidation via photocatalysis is a four-electron and multiple-proton process which requires high extra energy input to produce free dioxygen gas, making it exacting, especially under visible light irradiation. To improve the oxygen evolution reaction rates (OERs) and utilize more visible light, flower-like cobalt hydroxide/oxide (Fw-Co(OH)
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 07-2009
Publisher: American Chemical Society (ACS)
Date: 27-02-2019
Publisher: Elsevier BV
Date: 06-2013
Publisher: Springer Science and Business Media LLC
Date: 03-01-2013
DOI: 10.1007/S00430-012-0284-8
Abstract: Caveolin-1 is one of the major constituents of caveolae. Both Cav-1 and PrP are plasma membrane proteins, which show active capacities for molecular interactions with many other proteins or agents, including themselves. Using yeast two-hybrid system and immunoprecipitation, we reconfirmed the molecular interaction between human Cav-1 and PrP. With co-immunoprecipitation tests, PrP(C)-Cav-1 and PrP(Sc)-Cav-1 complexes were identified in the brain homogenates of normal and scrapie agent 263K-infected hamsters, respectively. Transient expression of wild-type PrP (PrP-PG5) in HEK293 cells did not change the situation of Cav-1 and subsequent signal transduction pathways, while cross-linking of the expressed PrP with specific antibody induced remarkable colocalization of PrP and Cav-1 on the plasma membrane and significant increases of phosphorylated Cav-1 and phosphorylated Fyn. With deleted and inserted PrP mutants within octarepeat region, we observed obvious octarepeat-associated phenomena, including lower binding capacity with Cav-1 in vitro, unable to co-localize with Cav-1 in the cells and to induce up-regulation of p-Cav-1 and p-Fyn when removal of octarepeats in the context of full-length PrP. Moreover, we found that treatment on HEK293 cells with fibrous form of recombinant PrP protein led to up-regulating the levels of p-Cav-1 and p-Fyn. Our data here provide strong evidence that octarepeats of PrP are critical for the interaction between PrP and Cav-1. Significant alterations in the cultured cells, either the distributions of PrP and Cav-1 morphologically or the up-regulations of p-Cav-1 and p-Fyn, induced by antibody-mediated cross-linking or fibrous forms of PrP may suggest a possible internalization process of PrP(Sc).
Publisher: Elsevier BV
Date: 04-2005
DOI: 10.1016/J.JCIS.2004.10.050
Abstract: Adsorption of a basic dye, methylene blue, from aqueous solutions onto as-received activated carbons and acid-treated carbons was investigated. The physical and surface chemical properties of the activated carbons were characterized using BET-N(2) adsorption, X-ray photoelectron spectroscopy (XPS), and mass titration. It was found that acid treatment had little effect on carbon textural characteristics but significantly changed the surface chemical properties, resulting in an adverse effect on dye adsorption. The physical properties of activated carbon, such as surface area and pore volume, have little effect on dye adsorption, while the pore size distribution and the surface chemical characteristics play important roles in dye adsorption. The pH value of the solution also influences the adsorption capacity significantly. For methylene blue, a higher pH of solution favors the adsorption capacity. The kinetic adsorption of methylene blue on all carbons follows a pseudo-second-order equation.
Publisher: Wiley
Date: 08-09-2020
Publisher: Elsevier BV
Date: 05-2009
Publisher: Elsevier BV
Date: 03-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA03220G
Abstract: Transition metal-based electrocatalysts for alkaline hydrogen evolution reaction.
Publisher: Elsevier BV
Date: 2012
DOI: 10.1016/J.JCIS.2011.09.060
Abstract: Zirconium-metal organic frameworks (Zr-MOFs) were synthesized with or without ammonium hydroxide as an additive in the synthesis process. It was found that addition of ammonium hydroxide would change the textural structure of Zr-MOF. The BET surface area, pore volume, and crystal size of Zr-MOF were reduced after addition of ammonium hydroxide. However, the crystalline structure and thermal stability were maintained and no functional groups were formed. Adsorption tests showed that Zr-MOF presented much higher CO(2) adsorption than CH(4). Zr-MOF exhibited CO(2) and CH(4) adsorption of 8.1 and 3.6 mmol/g, respectively, at 273 K, 988 kPa. The addition of ammonium hydroxide resulted in the Zr-MOF with a slight lower adsorption of CO(2) and CH(4), however, the selectivity of CO(2)/CH(4) is significantly enhanced.
Publisher: Elsevier BV
Date: 08-2018
DOI: 10.1016/J.JCIS.2018.03.084
Abstract: Mono-ethylene glycol (MEG), used in the oil and gas industries as a gas hydrate inhibitor, is a hazardous chemical present in wastewater from those processes. Metal-organic frameworks (MOFs) (modified UiO-66
Publisher: Elsevier BV
Date: 06-2010
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 08-2017
Publisher: Elsevier BV
Date: 09-2017
DOI: 10.1016/J.IJBIOMAC.2017.03.035
Abstract: Chitosan (CS) extracted from lobster shells (Persian Gulf, Iran), was grafted with amino functionalized multiwalled carbon nanotube (MWCNT). This novel material was characterized by FE-SEM and FT-IR and used for the ultrasound-assisted removal of Pb
Publisher: American Chemical Society (ACS)
Date: 08-04-2020
Publisher: American Chemical Society (ACS)
Date: 21-07-2023
Publisher: Elsevier BV
Date: 2020
DOI: 10.1016/J.JHAZMAT.2019.121010
Abstract: Porous nitrogen-doped reduced graphene oxide (NRGO) is successfully synthesized from graphene oxide via the combination of CO
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 05-2009
DOI: 10.1016/J.JCIS.2009.02.005
Abstract: Layer structured graphite oxide (GO) was prepared from graphite using the Hummers-Offeman method, characterised using N(2) adsorption, XRD, XPS, SEM(TEM), and FT-IR, and tested for humic acid (HA) adsorption in aqueous solution. XRD, XPS, and FT-IR measurements indicate the formation of layered structure with strong functional groups of GO. It is also found that the GO exhibits strong and much higher adsorption capacity of HA than graphite. The maximum adsorption capacity of the GO from the Langmuir isotherm is 190 mg/g, higher than activated carbon. For the adsorption, several parameters will affect the adsorption such as solid loading and pH. HA adsorption will decrease with increasing pH and an optimum GO loading is required for maximum adsorption.
Publisher: Wiley
Date: 17-02-2022
DOI: 10.1002/INF2.12294
Abstract: Vertical graphene (VG), possessing superior chemical, physical, and structural peculiarities, holds great promise as a building block for constructing a high‐energy density lithium‐sulfur (Li‐S) battery. Therefore, it is desirable to develop a new VG growth technique with a novel structure to enable wide applications. Herein, we devise a novel complex permittivity‐dependent plasma confinement‐assisted VG growth technique, via asymmetric growing a VG layer on one side of N‐doped carbon nanofibers for the first time, using a unique lab‐built high flux plasma‐enhanced chemical vapor deposition system, as a bifunctional nanofiber membrane to construct Li‐S batteries with low negative ositive (N/P) and electrolyte/sulfur (E/S) ratios. The unique nanofiber membrane could simultaneously protect the cathode and anode, enabling an excellent electrochemical performance with low N/P and E/S ratios in Li‐S batteries. Such a full cell delivers high gravimetric energy density and volumetric energy density of 340 Wh kg −1 and 547 Wh L −1 , respectively, at low N/P (2:1) and E/S (4:1) ratios. Furthermore, a pouch cell achieves a high areal capacity of 7.1 mAh cm −2 at a sulfur loading of 6 mg cm −2 . This work put forward a novel pathway for the design of high‐energy density Li‐S batteries. image
Publisher: American Chemical Society (ACS)
Date: 02-09-2020
Publisher: American Chemical Society (ACS)
Date: 10-2020
Publisher: Association for Research in Vision and Ophthalmology (ARVO)
Date: 31-03-2015
Publisher: Wiley
Date: 18-06-2020
Publisher: The Chemical Society of Japan
Date: 07-1999
DOI: 10.1246/CL.1999.569
Publisher: Elsevier BV
Date: 08-2018
DOI: 10.1016/J.JHAZMAT.2018.05.044
Abstract: Removal of toxic organics and bacterial disinfection are important tasks in wastewater treatment. Most heavy metal-based catalysts for degradation of aqueous organic pollutants in heterogeneous Fenton-like processes suffer from the toxicity of leached metals. The present work reports environmentally benign systems for both degradation of organics and bacterial disinfection. Calcium substituted LaFeO
Publisher: Portland Press Ltd.
Date: 05-03-2012
DOI: 10.1042/CS20110625
Abstract: AMPK (AMP-activated protein kinase) is one of the key players in maintaining intracellular homoeostasis. AMPK is well known as an energy sensor and can be activated by increased intracellular AMP levels. Generally, the activation of AMPK turns on catabolic pathways that generate ATP, while inhibiting cell proliferation and biosynthetic processes that consume ATP. In recent years, intensive investigations on the regulation and the function of AMPK indicates that AMPK not only functions as an intracellular energy sensor and regulator, but is also a general stress sensor that is important in maintaining intracellular homoeostasis during many kinds of stress challenges. In the present paper, we will review recent literature showing that AMPK functions far beyond its proposed energy sensor and regulator function. AMPK regulates ROS (reactive oxygen species)/redox balance, autophagy, cell proliferation, cell apoptosis, cellular polarity, mitochondrial function and genotoxic response, either directly or indirectly via numerous downstream pathways under physiological and pathological conditions.
Publisher: Elsevier BV
Date: 05-2019
Publisher: American Chemical Society (ACS)
Date: 09-09-2020
Publisher: Elsevier BV
Date: 12-2009
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA20667K
Abstract: The C, N-doped ZnO derived from ZIF-8 via two-step pyrolysis showed excellent performances in photocatalytic dye degradation and oxygen evolution.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA00555A
Abstract: Novel WO 3 @CoWO 4 bilayer nanosheets exhibit largely enhanced water oxidation performances compared with WO 3 in electrocatalysis, visible-light photocatalysis and photoelectrochemistry.
Publisher: Elsevier BV
Date: 08-2011
Publisher: American Chemical Society (ACS)
Date: 20-07-2018
Publisher: American Chemical Society (ACS)
Date: 05-04-2021
Publisher: Elsevier BV
Date: 2010
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 11-2012
Publisher: Elsevier BV
Date: 07-2008
DOI: 10.1016/J.MCE.2008.04.004
Abstract: Members of the aldo-keto reductase (AKR) superfamily have been implicated in prostaglandin (PG) metabolism and prostate cancer. AKR1C3 possesses 11-ketoprostaglandin reductase activity and is capable of converting PGD2 to 9alpha, 11beta-PGF2alpha, whereas AKR1C2-mediated PG metabolism remains unclear. The accumulation of PGF2alpha may generate proliferative signals to promote prostate cell growth. Levels of AKR1C2 and AKR1C3 expression are elevated in localized and advanced prostate cancer. To study the significance of AKR1C2- and AKR1C3-mediated PGD2 conversion in human prostate cell proliferation, we stably transfected androgen insensitive human prostate cancer PC-3 cells with AKR1C2 or AKR1C3 cDNA. PC-3 cells overexpressing AKR1C2 and AKR1C3 had elevated cell proliferation in response to PGD2 stimulation as compared to mock transfectants. Overexpression of AKR1C2 or AKR1C3 did not alter levels of PGF receptor (FP) expression. Inclusion of an FP antagonist (AL8810) significantly suppressed PGD2-stimulated PC-3 cell proliferation in these stable transfectants. In addition, PGD2 significantly elevated levels of total Akt protein expression and Akt Ser473 phosphorylation in AKR1C2 and AKR1C3 stable transfectants and inclusion of a phosphatidylinositol 3-kinase (PI3K) chemical inhibitor (LY294002) attenuated PGD2-stimulated cell proliferation in these transfectants. Our results suggested that both AKR1C2 and AKR1C3 mediate similar PGD2 conversion toward the accumulation of proliferative signals through FP and PI3K/Akt signaling pathways to promote prostate cell proliferation.
Publisher: Elsevier BV
Date: 08-2015
Publisher: Elsevier BV
Date: 11-2020
Publisher: Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau
Date: 08-07-2021
Abstract: Metal organic frameworks (MOFs) are frequently used as adsorbents in adsorption processes to remove dyes from effluent produced by the textile industry. Today, dye contaminants have become an important environmental problem. One of these dyes is methylene blue (MB) and its removal from wastewater is a priority because it is persistent and nondegradable. MB is used in many industries although it has potential harmful effects on human and aquatic life and can be considered a hazardous chemical when in wastewater. The present study shows the potential applications for enhanced forms of UiO-66 MOFs, such as UiO-66, UiO-66-10%Al and UiO-66-30%Al. These forms were prepared to remove MB from wastewater using batch experiments. Characterisation of adsorbents were accomplished successfully using Fourier transform infrared, X-ray powder diffraction, Brunauer–Emmett–Teller surface area and thermogravimetric analysis techniques. To investigate equilibrium adsorptive behaviour, Langmuir and Freundlich isotherm models were tested against the experimental data. Based on linear regression correlation coefficient (R2), the Freundlich model described the equilibrium isotherm of MOF/MB better than the Langmuir model. Of all forms of UiO-66 MOF, UiO-66-10%Al had the maximum Langmuir adsorption capacity at 49.26 mg/g. A kinetics study examined pseudo first-order, pseudo second order and Elovich models to determine which could explain the sorption mechanism. While the pseudo second order and Elovich models showed a good fit with the experimental data, the correlation coefficient of the pseudo second-order model was the highest. These results indicate that adsorption of MB is controlled by a chemisorption mechanism. Further, intraparticle diffusion was utilised to describe the adsorption mechanism and determine the rate-limiting steps in the adsorption process.
Publisher: Springer Science and Business Media LLC
Date: 10-03-2017
DOI: 10.1038/SREP44215
Abstract: Perovskite-like oxides SrCo 1−x Ti x O 3−δ (SCT x , x = 0.1, 0.2, 0.4, 0.6) were used as heterogeneous catalysts to activate peroxymonosulfate (PMS) for phenol degradation under a wide pH range, exhibiting more rapid phenol oxidation than Co 3 O 4 and TiO 2 . The SCT 0.4 /PMS system produced a high activity at increased initial pH, achieving optimized performance at pH ≥ 7 in terms of total organic carbon removal, the minimum Co leaching and good catalytic stability. Kinetic studies showed that the phenol oxidation kinetics on SCT 0.4 /PMS system followed the pseudo-zero order kinetics and the rate on SCT 0.4 /PMS system decreased with increasing initial phenol concentration, decreased PMS amount, catalyst loading and solution temperature. Quenching tests using ethanol and tert-butyl alcohol demonstrated sulfate and hydroxyl radicals for phenol oxidation. This investigation suggested promising heterogeneous catalysts for organic oxidation with PMS, showing a breakthrough in the barriers of metal leaching, acidic pH, and low efficiency of heterogeneous catalysis.
Publisher: Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau
Date: 12-02-2020
Abstract: In this study, two improved versions of UiO-66 were successfully synthesised. Modified UiO-66 and UiO-66-Ce were characterised to confirm the integrity of the structure, the stability of functional groups on the surface and the thermal stability. Activated s les were used for removal harmful anionic dye (methyl orange) (MO) from wastewater. Batch adsorption process was relied to investigate the competition between those MOFs for removing MO from aqueous solution. Based on the results, at a higher initial concentration, the maximum MO uptake was achieved by UiO-66-Ce which was better than modified-UiO-66. They adsorbed 71.5 and 62.5 mg g-1 respectively. Langmuir and Freundlich isotherms were employed to simulate the experimental data. In addition, Pseudo first order and Pseudo second order equations were used to describe the dynamic behaviour of MO through the adsorption process. The high adsorption capacities on these adsorbents can make them promised adsorbents in industrial areas.
Publisher: Elsevier BV
Date: 02-2020
DOI: 10.1016/J.JHAZMAT.2019.121486
Abstract: Metal-free mesoporous graphitic frameworks with built-in nanotubes (CPGs) were synthesized via facile co-pyrolysis of cyclodextrin and a cobalt salt with subsequent acid pickling to remove the embedded metal species. Due to the high graphitic degree and built-in few-layer nanotubes, the as-synthesized carbonaceous materials possess a higher catalytic ozonation activity than that of the state-of-the-art carbon nanotubes (CNTs) and LaMnO
Publisher: Elsevier BV
Date: 03-2012
Publisher: American Chemical Society (ACS)
Date: 11-2019
Publisher: Elsevier BV
Date: 15-08-2010
DOI: 10.1016/J.TALANTA.2010.04.032
Abstract: Ellagic acid (EA) reacted with Gemini zwitterionic surfactant, phosphodiesters quaternary ammonium salt (PQAS), and formed fine particles which produced strong enhancement in intensity of resonance light scattering (RLS). The effects of several factors on the RLS signal, such as pH, ionic strength, PQAS concentration and so on, were optimized. The relationship between enhanced RLS intensity and EA concentration was constructed. A novel and rapid method for the determination of EA was built. The linear range of this method was 0.016-4.0 microg mL(-1) and the detection limit was 13.9 ng mL(-1). Under the optimum conditions, the proposed method was applied to determine EA in body fluids with the results of quantitative recoveries between 98.4-101.4% in human serum s les and 99.1-102% in human urine s les. This method characterized by low limit detection is very sensitive and the cost is low, and constitutes a fast one-step procedure which requires only measuring the RLS intensities. The mechanism of the reaction was also studied. This investigation could contribute to the research on the delivery and release of bioactive molecules by Gemini surfactants.
Publisher: Elsevier BV
Date: 2018
Publisher: American Chemical Society (ACS)
Date: 12-12-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8EN01047A
Abstract: Quasi single cobalt sites are fabricated using the confined space, and show enhanced catalytic performances compared with aggregated Co 3 O 4 .
Publisher: Elsevier BV
Date: 12-01-2010
Publisher: Elsevier BV
Date: 06-2018
DOI: 10.1016/J.JCIS.2018.02.059
Abstract: In the present study, a polyaniline/carboxymethyl cellulose/TiO
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA10592J
Publisher: Elsevier BV
Date: 06-2012
Publisher: American Chemical Society (ACS)
Date: 12-07-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NR03924A
Abstract: Inverse opal (IO) macroporous semiconductor materials with unique physicochemical advantages have been widely used in solar-related environmental areas.
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 03-2005
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 2017
DOI: 10.1016/J.ULTSONCH.2016.06.007
Abstract: This paper focuses on the development of an effective methodology to obtain the optimum removal conditions assisted by ultrasonics to maximize the simultaneous removal of dyes, eosin Y (EY), methylene blue (MB) and phenol red (PR), by Cu(OH)
Publisher: Elsevier BV
Date: 08-2016
DOI: 10.1016/J.JCIS.2016.05.026
Abstract: Graphitic carbon nitride (GCN) is a promising metal-free photocatalyst while suffering from low charge mobility induced inefficient photocatalysis. In this work, oxygen doping was employed to enhance the photodegradation of organic pollutants in water on graphitic carbon nitride (GCNO) under visible light. For further absorption extension, four organic dyes (Eosin-Y, Perylene, Nile-red and Coumarin) were adopted to dye-sensitize the GCNO photocatalyst. It was found that O-doping can promote dye sensitization, which was dependent on the type of dyes and influenced the photodegradation efficiencies of methylene blue (MB) and phenol. Nile-red sensitized GCNO presented the best activity in MB degradation under λ>480nm irradiations while Eosin-Y showed the best sensitization performance for phenol degradation under λ>420nm light source. However, dye sensitization was not effective for enhanced pollutant degradation on GCN without O-doping. UV-vis diffuse reflectance spectra (UV-vis DRS), photoluminescence (PL) spectra, and photocurrent analyses were applied to investigate the mechanism of carriers' transfer, which indicated that dye molecules could inject extra electrons into GCNO energy band and the energy dislocation could suppress electron/hole recombination, enhancing photocatalytic performances.
Publisher: American Chemical Society (ACS)
Date: 23-05-2023
Publisher: American Chemical Society (ACS)
Date: 18-11-2021
Abstract: Peroxymonosulfate (PMS)-based advanced oxidation processes (PMS-AOPs) as an efficient strategy for organic degradation are highly dependent on catalyst design and structured active sites. However, the identification of the active sites and their relationship with reaction mechanisms for organic degradation are not fully understood for a composite catalyst due to the complex structure. Herein, we developed a family of Co encapsulated in N-doped carbons (Co-PCN) with tailored types and contents of active sites via manipulated pyrolysis for PMS activation and ciprofloxacin (CIP) degradation, focusing on the correlation of active sites to generated reactive species and degradation routes of organics. The structure-function relationships between the different active sites in Co-PCN catalysts and reactive oxygen species (ROS), as well as bond breaking position of CIP, were revealed through regression analysis and density functional theory calculation. Co-N
Publisher: American Chemical Society (ACS)
Date: 17-10-1998
DOI: 10.1021/EF980064J
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 12-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA07633C
Abstract: Low temperature deposition of N-doped vertical graphene realized at low temperature lab-built high-flux plasma enhanced chemical vapor deposition (HPECVD) system, with outstanding catalytic performance enabled for ORR in Zn–air batteries.
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1RA00419K
Publisher: The Chemical Society of Japan
Date: 05-1999
DOI: 10.1246/CL.1999.385
Publisher: International Union of Crystallography (IUCr)
Date: 13-02-2008
Publisher: Elsevier BV
Date: 03-2018
Publisher: American Chemical Society (ACS)
Date: 18-12-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6EN00633G
Abstract: Singlet oxygen produced during peroxymonosulfate activation by N-graphene dominated the pollutants degradation.
Publisher: Elsevier BV
Date: 05-2012
DOI: 10.1016/J.JHAZMAT.2012.02.045
Abstract: Activated carbon (AC) and Zeolite Socony Mobil-5 (ZSM5) supported ruthenium oxide catalysts were prepared and tested to degrade aqueous phenol in the presence of peroxymonosulphate. The physicochemical properties of ruthenium oxide based catalysts were characterised by several techniques such as XRD (X-ray diffraction), SEM-EDS (scanning electron microscopy-energy dispersive X-ray spectroscopy), and N(2) adsorption. It was found that RuO(2)/AC was highly effective in heterogeneous activation of peroxymonosulphate to produce sulphate radicals, presenting higher reaction rate in phenol degradation compared with RuO(2)/ZSM-5. Degradation efficiency of phenol could be achieved at 100% of phenol decomposition and 60% of total organic carbon (TOC) removal in 1h at the conditions of 50ppm phenol, 0.2g catalyst, 1g Oxone(®) in 500mL solution at 25°C using the two catalysts. It was also found that phenol degradation was strongly influenced by catalyst loading, phenol concentration, Oxone(®) concentration and temperature. Kinetic studies proved that a pseudo first order kinetics would fit to phenol decomposition and the activation energies for RuO(2)/AC and RuO(2)/ZSM5 were obtained to be 61.4 and 42.2kJ/mol, respectively.
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 03-2020
DOI: 10.1016/J.JHAZMAT.2019.121548
Abstract: In the present study, hydrochars (HCs) were prepared from pinewood biomass by high-temperature pyrolysis and applied as environmental-friendly adsorbents and catalysts in the removal of bisphenol F (BPF) and bisphenol S (BPS) from water. It was found that the structural oxygen defects on hydrochars not only enhance the specific surface area for adsorption of the bisphenols, but also function as an electron conductor for molecular oxygen activation in nonradical pathways. The hydrochar pyrolyzed at 800 °C (HC-800) showed the superior adsorption and catalytic performances toward BPS and BPF removals in a wide pH range, and the removal efficiencies were hardly inhibited by the coexistent inorganic anions and humic acid. Particularly, the nonradical reaction is the dominated catalytic oxidation process in a H
Publisher: Elsevier BV
Date: 04-2016
Publisher: Springer Science and Business Media LLC
Date: 07-2012
DOI: 10.1007/S12031-012-9845-Y
Abstract: CK2 shows disease-associated alteration in the scrapie experimental rodents and human prion diseases. In this study, mammalian expressing plasmids for human CK2 subunits, CK2α and CK2β, were generated. Immunoprecipitation assays revealed stronger signals of PrP-CK2α complexes in the HEK293 cells co-transfected with plasmids expressing CK2α and various PrP constructs, including PG5, CytoPrP, PG9, and PG12. Meanwhile, obviously weaker signals of PrP-CK2β complexes were also observed in the cells co-expressing CK2β and PrPs. Tubulin-specific Western blots and immunofluorescence assays revealed that similar as the observations in the presences of PrP-specific siRNA, the abnormal PrPs-induced reductions of tubulin and disruptions of microtubule structures were completely restored in the cells when co-expressing CK2α and CK2β. Moreover, co-expressions of CK2α and PrPs induced phosphorylation on p53 at the position of serine 6 (p53-Ser6), although much weaker than that in the cells expressing CK2α and CK2β, while expressions of either PrPs or CK2 subunits did not change the cellular p53 level or induce phosphorylation on p53 at Ser9. Our data here verify again the molecular interaction between CK2 and PrP. Co-presences of CK2 subunits restore the down-regulated tubulin and disrupted microtubule structures caused by expressions of the abnormal PrP proteins in HEK293 cells.
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.ENVINT.2019.02.032
Abstract: Regulated disposal or re-utilization of dewatered sludge is of economic benefits and can avoid secondary contamination to the environment however, feasible and effective management strategies are still lacking. In this study, a peroxydisulfate/zero-valent iron (PDS-ZVI) system is proposed to destroy proteins in soluble extracellular polymeric substances (S-EPS) and loosely bound EPS (LB-EPS) in anaerobic digested sludge (ADS) to improve the dewaterability. Moreover, ADS derived biochars supported via iron oxides (Fe-ADSBC) were generated by dewatering and thermal annealing. Intriguingly, the iron species was discovered to gradually transform from Fe
Publisher: Elsevier BV
Date: 12-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA05523H
Abstract: A high surface area activated carbon which was prepared by an innovative approach using glucose as a carbon source and neutral potassium citrate as an activator was compared with the porous carbon using corrosive potassium hydroxide as activator.
Publisher: Authorea, Inc.
Date: 14-06-2023
DOI: 10.22541/AU.168673633.39544801/V1
Abstract: The extensive utilization of plastics in modern human society has resulted in severe environmental pollution caused by microplastics (MP/MPs). The escalating consumption of plastics has led to pervasive presence of microplastics in aquatic environments, which not only carry toxic organic matter, transport toxic chemicals, but also spread through the food chain, seriously threatening marine life and human health. Therefore, various advanced strategies have been developed for separating and degrading MPs from water. Using magnetic materials and their nanostructures for targeting, adsorbing, transporting, and degrading MPs is a promising strategy. However, a comprehensive review of MP remediation using magnetic materials and their nanostructures is currently lacking. The present work aims to fill in the gap by providing a critical review of the recent advances in MP removal/degradation using magnetic materials. The primary focus is to compare and analyze MP’s removal efficiencies of different magnetic materials, including iron/ferrite nanoparticles, magnetic nanocomposites, and micromotors, aiming to unravel the underlying roles of magnetic materials in different types of MP degradation and present the general strategies for designing them to achieve optimal performance. Finally, the review outlines the forthcoming challenges and perspectives in the development of magnetic nanomaterials for MP remediation.
Publisher: American Chemical Society (ACS)
Date: 03-11-2020
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 12-2019
Publisher: Springer Science and Business Media LLC
Date: 30-07-2015
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.JCIS.2015.11.032
Abstract: In this study, we demonstrate for the first time that highly branched gold nanostars (AuNSs) and silica-coated AuNSs (AuNSs@mSiO2) could potentially serve as efficient hydrogenation catalysts. The catalytic activity could be promoted by raising the number of tipped-branches of AuNSs, which reveals that the tips play an important role as active sites. The fabricated sharply-pointed AuNSs benefit the electron transfer from BH4 anions to 4-nitrophenol. Coating AuNSs with mesoporous silica (AuNSs@mSiO2) further enhanced the reduction rate and recyclability, and also contributed to reducing the induction period. The AuNSs@mSiO2 (50-100nm in diameter) are large enough to be catalytically inactive, but they consist of sharply-pointed tips with the radius of 2.6-3.6nm, which are rich in coordinately unsaturated sites similar to those of nanoparticles and clusters. Such features in structure and activity would also extend their application range in heterogeneous catalysis.
Publisher: Elsevier BV
Date: 03-2010
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 06-2010
DOI: 10.1016/J.JHAZMAT.2010.01.091
Abstract: Dye degradation using advanced oxidation processes with Co(2+)/H(2)O(2) and Co(2+) eroxymonosulfate (PMS) systems has been investigated. Two types of dyes, basic blue 9 and acid red 183, were employed. Several parameters affecting dye degradation such as Co(2+), PMS, H(2)O(2), and dye concentrations were investigated. The optimal ratio of oxidant (PMS, H(2)O(2))/Co(2+) for the degradation of two dyes was determined. It is found that dye decomposition is much faster in Co(2+)/PMS system than in Co(2+)/H(2)O(2). For Co(2+)/H(2)O(2), an optimal ratio of H(2)O(2) to Co(2+) at 6 is required for the maximum decomposition of the dyes. For Co(2+)/PMS, higher concentrations of Co(2+) and PMS will increase dye degradation rate with an optimal ratio of 3, achieving 95% decolourisation. For basic blue 9, a complete decolourisation can be achieved in 5 min at 0.13 mM Co(2+), 0.40 mM PMS and 7 mg/l basic blue 9 while the complete degradation of acid red 183 will be achieved at 30 min at 0.13 mM Co(2+), 0.40 mM PMS and 160 mg/l of acid red 183. The degradation of acid red 183 follows the second-order kinetics.
Publisher: Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau
Date: 14-07-2019
Abstract: In this study, feed coal (FC) from the Figueira Thermoelectric Power Plant (FTPP), located in the state of Paraná (PR), Brazil was characterized by X-ray fluorescence (XRF), X-ray diffractometry (XRD), infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), particle size distribution analysis by laser diffraction, loss of ignition (LOI), total carbon content (TC), pH and conductivity. FC-derived by-products (CCBs) collected at the FTPP were: bottom ash (BA), fly ash from cyclone filter (CA) and fly ash from bag filter (FA). In addition to the techniques used for feed coal characterization, CCBs were also characterized by total surface area (by using BET method), external surface area (by using laser diffraction), cation exchange capacity (CEC), bulk density, besides leaching and solubilization tests. FC s le contains 72.2% of volatile material, of which 55.3% is total carbon content. LOI, FTIR, TGA and TC analyzes corroborated with these results. The main crystalline phases in the FC s le were found to be quartz, kaolinite and pyrite. The elements As, Cr, Ni and Pb were encountered in the FC s le, indicating that the use of FTPP feed coal should be monitored due to the toxic potential of these elements. The three coal ashes were classified as class F according to ASTM and presented similar chemical composition, with total content of the main oxides (SiO2, Al2O3 and Fe2O3) above 72%. Ashes enrichment factor analysis (EF) showed that As, Zn and Pb concentrate mainly in fly ash from bag filter (FA), whereas the elements K and Mg presented higher enrichment in the bottom ash (BA) . All ashes presented quartz, mullite and magnetite as crystalline phases, as well as the same functional groups, related to the presence of humidity, organic matter and Si and Al compounds. XRD, XRF, TGA, FTIR, LOI and TC techniques were correlated and confirmed the obtained results. Total and external surface area values of CCBs were related to the total carbon content (TC), as well as to the results of particle size distribution and the scanning electron micrographs of the s les. On the other hand the CEC of the ashes showed relation with the particle size distribution and with the external surface area. Leaching and solubilization tests of CCBs showed that FA s le was considered hazardous and classified as class I waste, while CA and BA s les were considered non-hazardous and non-inert wastes and classified as class II-A. FA s le from Figueira power plant must be discarded only after treatment or a stringent disposal criterion must be followed to avoid contamination on site. In this work, feed coal s le was also compared to the CCBs s les generated from it. The results showed the differences between fuel and products through the different characterization techniques. In addition to contributing to the understanding of the relationship between coal and its combustion products, this work can also help to reduce the environmental impacts caused by the CCBs disposal, as well as can also be used to compare the characteristics of CCBs from FTPP with the new wastes that will be generated by the same thermal power plant that will be soon modernized.
Publisher: Elsevier BV
Date: 09-2015
Publisher: American Chemical Society (ACS)
Date: 20-06-2019
Publisher: Elsevier BV
Date: 03-2016
Publisher: Wiley
Date: 02-08-2017
Publisher: Wiley
Date: 21-02-2001
DOI: 10.1002/JCTB.373
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 03-2014
Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 05-2017
Publisher: American Chemical Society (ACS)
Date: 23-08-2021
Publisher: American Chemical Society (ACS)
Date: 21-12-2021
Abstract: Persulfate-based nonradical oxidation processes (PS-NOPs) are appealing in wastewater purification due to their high efficiency and selectivity for removing trace organic contaminants in complicated water matrices. In this review, we showcased the recent progresses of state-of-the-art strategies in the nonradical electron-transfer regimes in PS-NOPs, including design of metal and metal-free heterogeneous catalysts, in situ/operando characterization/analytical techniques, and insights into the origins of electron-transfer mechanisms. In a typical electron-transfer process (ETP), persulfate is activated by a catalyst to form surface activated complexes, which directly or indirectly interact with target pollutants to finalize the oxidation. We discussed different analytical techniques on the fundamentals and tactics for accurate analysis of ETP. Moreover, we demonstrated the challenges and proposed future research strategies for ETP-based systems, such as computation-enabled molecular-level investigations, rational design of catalysts, and real-scenario applications in the complicated water environment. Overall, this review dedicates to sharpening the understanding of ETP in PS-NOPs and presenting promising applications in remediation technology and green chemistry.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA11368A
Abstract: Graphitic-C 3 N 4 quantum dots (g-C 3 N 4 QDs), which can be prepared by top-down and bottom-up synthesis, exhibit excellent optical features. They can act as different roles during the photo(electro)catalytic removal of organic pollutants.
Publisher: Elsevier BV
Date: 06-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA02474J
Abstract: Thermally dehydrated aluminate cement granules show a large phosphate adsorption capacity of 49.1 mg P per g and fast and high initial adsorption.
Publisher: Elsevier BV
Date: 10-2016
Publisher: Wiley
Date: 26-01-2023
Abstract: H 2 O 2 ‐fueled micromotors are state‐of‐the‐art mobile microreactors in environmental remediation. In this work, a magnetic FeO x @MnO 2 @SiO 2 micromotor with multi‐functions is designed and demonstrated its catalytic performance in H 2 O 2 eroxymonosulfate (PMS) activation for simultaneously sustained motion and organic degradation. Moreover, this work reveals the correlations between catalytic efficiency and motion behavior/mechanism. The inner magnetic FeO x nanoellipsoids primarily trigger radical species ( • OH and O 2 •− ) to attack organics via Fenton‐like reactions. The coated MnO 2 layers on FeO x surface are responsible for decomposing H 2 O 2 into O 2 bubbles to provide a propelling torque in the solution and generating SO 4 •− and • OH for organic degradation. The outer SiO 2 microcapsules with a hollow head and tail result in an asymmetrical Janus structure for the motion, driven by O 2 bubbles ejecting from the inner cavity via the opening tail. Intriguingly, PMS adjusts the local environment to control over‐violent O 2 formation from H 2 O 2 decomposition by occupying the Mn sites via inter‐sphere interactions and enhances organic removal due to the strengthened contacts and Fenton‐like reactions between inner FeO x and peroxides within the microreactor. The findings will advance the design of functional micromotors and the knowledge of micromotor‐based remediation with controlled motion and high‐efficiency oxidation using multiple peroxides.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA07437C
Abstract: Recent advances in the synthesis of 2D C x N y nanocrystals and their properties and applications are summarized future challenges and opportunities for 2D C x N y nanocrystals are also discussed.
Publisher: Wiley
Date: 08-2017
Publisher: Elsevier BV
Date: 04-2013
Publisher: Elsevier BV
Date: 03-2017
DOI: 10.1016/J.JCIS.2016.11.100
Abstract: In this study, binary metal organic frameworks (MOFs) with HKUST-1 and UiO-66 have been synthesized in a one-pot process. The synthesized MOFs were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), N
Publisher: Informa UK Limited
Date: 10-04-2017
DOI: 10.1080/10962247.2017.1280560
Abstract: Activated carbons were prepared from tobacco stem by chemical activation using potassium hydroxide (KOH), potassium carbonate (K Tobacco stem, the residue from cigarette manufacturing, is usually discarded as waste, leading to serious resource waste and environmental problems. This study provides an effective utilization available for this solid residue by using it as the starting material in the preparation of activated carbon with chemical activation. Activated carbons with high specific area and various surface functions have been prepared, and the effects of the amount and type of activating agents on the physical and chemical properties of activated carbon were investigated as well.
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 12-2017
DOI: 10.1016/J.JCIS.2017.08.043
Abstract: Nanofluids (i.e. nanoparticles dispersed in a fluid) have tremendous potential in a broad range of applications, including pharmacy, medicine, water treatment, soil decontamination, or oil recovery and CO
Publisher: Elsevier BV
Date: 03-2015
Publisher: Wiley
Date: 13-08-2020
Publisher: Elsevier BV
Date: 2024
Publisher: Elsevier BV
Date: 04-2018
DOI: 10.1016/J.CHEMOSPHERE.2017.12.164
Abstract: Water-stable and active metal organic frameworks (MOFs) are important materials for mitigation of water contaminants via adsorption and catalytic reactions. In this study, a highly water-stable Co-based MOF, namely bio-MOF-11-Co, was synthesized by a simplified benign method. Moreover, it was used as a catalyst in successful activation of peroxymonsulfate for catalytic degradation of sulfachloropyradazine (SCP) and para-hydroxybenzoic acid (p-HBA) as representatives of pharmaceuticals and personal care products, respectively. The bio-MOF-11-Co showed rapid degradation of both p-HBA and SCP and could be reused multiple times without losing the activity by simply water washing. The effects of catalyst and PMS loadings as well as temperature were further studied, showing that high catalyst and PMS loadings as well as temperature produced faster kinetic degradation of p-HBA and SCP. The generation of highly reactive and HO radicals during the degradation was investigated by quenching tests and electron paramagnetic resonance. A plausible degradation mechanism was proposed based on the functionalities in the bio-MOF-11-Co. The availability of electron rich nucleobase adenine reinforced the reaction kinetics by electron donation along with cobalt atoms in the bio-MOF-11-Co structure.
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.JCIS.2016.06.032
Abstract: The increasing concerns on toxicity of sulfonamide antibiotics in water require a prompt action to establish efficient wastewater treatment processes for their removal. In this study, adsorptive removal of a model sulfonamide antibiotic, sulfachloropyridazine (SCP), from wastewater is presented for the first time using a metal organic framework (MOF). A high surface area and thermally stable MOF, HKUST-1, was synthesized by a facile method. Batch adsorption studies were systematically carried out using HKUST-1. The high surface area and unsaturated metal sites resulted in a significant adsorption capacity with faster kinetics. Most of the SCP was removed in 15min and the kinetic data were best fitted with the pseudo second order model. Moreover, isothermal data were best fitted with the Langmuir model. The thermodynamic results showed that the adsorption is a spontaneous and endothermic process. The adsorption capacity of HKUST-1 is 384mg/g at 298K which is the highest compared to most of the materials for the antibiotics. The high adsorption capacity is attributed mainly to π-π stacking, hydrogen bonding and electrostatic interactions.
Publisher: Elsevier BV
Date: 08-2015
Publisher: Wiley
Date: 28-10-2016
Publisher: Elsevier BV
Date: 08-2019
Publisher: Springer Science and Business Media LLC
Date: 26-02-2014
DOI: 10.1007/S11356-014-2645-X
Abstract: A magnetic ZnFe2O4-reduced graphene oxide (rGO) hybrid was successfully developed as a heterogeneous catalyst for photo-Fenton-like decolorization of various dyes using peroxymonosulfate (PMS) as an oxidant under visible light irradiation. Through an in situ chemical deposition and reduction, ZnFe2O4 nanoparticles (NPs) with an average size of 23.7 nm were anchored uniformly on rGO sheets to form a ZnFe2O4-rGO hybrid. The catalytic activities in oxidative decomposition of organic dyes were evaluated. The reaction kinetics, effect of ion species and strength, catalytic stability, degradation mechanism, as well as the roles of ZnFe2O4 and graphene were also studied. ZnFe2O4-rGO showed to be a promising photocatalyst with magnetism for the oxidative degradation of aqueous organic pollutants and simple separation. The combination of ZnFe2O4 NPs with graphene sheets leads to a much higher catalytic activity than pure ZnFe2O4. Graphene acted as not only a support and stabilizer for ZnFe2O4 to prevent them from aggregation, largely improving the charge separation in the hybrid material, but also a catalyst for activating PMS to produce sulfate radicals at the same time. The ZnFe2O4-rGO hybrid exhibited stable performance without losing activity after five successive runs.
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 04-2019
DOI: 10.1016/J.JCIS.2019.01.117
Abstract: Cerium is an important rare earth element (REE), which can be used for many high-tech applications. From the industrial and environmental viewpoints, it is imperative to recover Ce
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 02-2020
DOI: 10.1016/J.JHAZMAT.2019.121323
Abstract: Graphite carbon nitride (g-C
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 11-2020
Publisher: American Chemical Society (ACS)
Date: 05-05-2016
Publisher: American Chemical Society (ACS)
Date: 21-01-2022
Publisher: Springer Science and Business Media LLC
Date: 08-2017
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 04-2016
DOI: 10.1016/J.JCIS.2016.01.051
Abstract: Metal-free semiconductors offer a new opportunity for environmental photocatalysis toward a potential breakthrough in high photo efficiency with complete prevention of metal leaching. In this study, graphitic carbon nitride (GCN) modified by oxygen functional groups was synthesized by a hydrothermal treatment of pristine GCN at different temperatures with H2O2. Insights into the emerging characteristics of the modified GCN in photocatalysis were obtained by determining the optical properties, band structure, electrochemical activity and pollutant degradation efficiency. It was found that the introduction of GCN with oxygen functional groups can enhance light absorption and accelerate electron transfer so as to improve the photocatalytic reaction efficiency. The photoinduced reactive radicals and the associated photodegradation were investigated by in situ electron paramagnetic resonance (EPR). The reactive radicals, O2(-) and OH, were responsible for organic degradation.
Publisher: Elsevier BV
Date: 09-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA11427A
Publisher: Elsevier BV
Date: 12-2015
Publisher: Wiley
Date: 28-07-2021
Abstract: As emerging micro/nano‐scale devices, micro/nanomotors have been innovatively applied in the environmental and biomedical applications. In this paper, the recent advances of Mn‐based micro/nanomotors (Mn‐micro/nanomotors) in catalytic oxidation of organic contaminants and the mechanisms in decomposition of H 2 O 2 (e.g., the generation of O 2 bubbles and reactive oxygen species) are reviewed. The intrinsic characteristics and synthetic strategies of Mn‐based materials are discussed, aiming to gain comprehensive understandings on the asymmetric design of micro/nanomotors. Mn‐micro/nanomotors have many advantages such as flexible structures, biocompatibility, powerful motion, long lifetime, and low‐cost as compared to noble‐metal micro/nanomotors. These merits fulfil Mn‐micro/nanomotors great promises from proof‐of‐concept studies to realistic applications, including pollutant decomposition, trace detection of heavy metal ions, oil removal, drug delivery, isolation of biological targets, and killing bacteria and cancer cells. The great flexibility in fabrication enables erse and innovative strategies to address challenges for Mn‐micro/nanomotors, including high consumption of H 2 O 2 and non‐directional motion. Meanwhile, a perspective of Mn‐micro/nanomotors in water remediation by coupling the motors with other Fenton/Fenton‐like systems to enhance the catalytic activity and to yield more reactive oxygen species is presented. Directions to the design of on‐demand H 2 O 2 ‐fueled Mn‐micro/nanomotors for advanced purification of organic contaminants in aquatic systems are also proposed.
Publisher: American Chemical Society (ACS)
Date: 25-11-2020
Abstract: Integrating carbon nitride with graphene into a lateral heterojunction would avoid energy loss within the interlaminar space region on conventional composites. To date, its synthesis process is limited to the bottom-up method which lacks the targeting and homogeneity. Herein, we proposed a hydrogen-initiated chemical epitaxial growth strategy at a relatively low temperature for the fabrication of graphene/carbon nitride in-plane heterostructure. Theoretical and experimental analysis proved that methane via
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 04-2012
DOI: 10.1016/J.JCIS.2012.01.043
Abstract: Solution combustion using urea as a fuel was employed to synthesise Co oxide and Al(2)O(3)-, SiO(2)- and TiO(2)-supported Co oxide catalysts. The catalysts were characterised using several techniques such as N(2) adsorption/desorption, XRD, FTIR, UV-vis diffuse reflectance and SEM-EDX, and their catalytic activity was evaluated in phenol degradation in aqueous solution with sulphate radicals. Solution combustion is a simple and effective method in preparation of supported Co catalysts. Co(3)O(4) was the major Co crystal phase in the s les prepared via the combustion synthesis. Bulk Co(3)O(4) particles were not effective in reaction, but supported Co oxides showed higher activity than unsupported Co oxide. The supports influenced Co dispersion and catalytic activity. Co/TiO(2) exhibited the highest activity, but it deactivated much faster than other two supported catalysts. Co/SiO(2) showed a comparable activity to Co/Al(2)O(3) and the best stability among the three Al(2)O(3)-, SiO(2)- and TiO(2)-supported Co catalysts.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR30244F
Abstract: Several zirconium-based metal-organic frameworks (Zr-MOFs) have been synthesized using ammonium hydroxide as an additive in the synthesis process. Their physicochemical properties have been characterized by N(2) adsorption/desorption, XRD, SEM, FTIR, and TGA, and their application in CO(2) adsorption was evaluated. It was found that addition of ammonium hydroxide produced some effects on the structure and adsorption behavior of Zr-MOFs. The pore size and pore volume of Zr-MOFs were enhanced with the additive, however, specific surface area of Zr-MOFs was reduced. Using an ammonium hydroxide additive, the crystal size of Zr-MOF was reduced with increasing amount of the additive. All the s les presented strong thermal stability. Adsorption tests showed that capacity of CO(2) adsorption on the Zr-MOFs under standard conditions was reduced due to decreased micropore fractions. However, modified Zr-MOFs had significantly lower adsorption heat. The adsorption capacity of carbon dioxide was increased at high pressure, reaching 8.63 mmol g(-1) at 987 kPa for Zr-MOF-NH(4)-2.
Publisher: IWA Publishing
Date: 09-2010
DOI: 10.2166/WST.2010.388
Abstract: An agricultural waste derived adsorbent was prepared by chemically modified barley straw with NaOH and a cationic surfactant hexadecylpyridinium chloride monohydrate (CPC). The prepared adsorbent, BMBS, was used for removal of anionic dyes Acid Blue (AB40) and Reactive Blue 4 (RB4) from aqueous solution in a batch adsorption system. The adsorbent was characterized by FT-IR and elemental composition. The stability of CPC adsorbed on straw surface was also evaluated by exposing to aqueous solution. In adsorption tests, influence of operation parameters such as contact time, initial concentration and pH of solution on AB40 and RB4 uptake were investigated and discussed. The CPC was observed strongly attached to straw surface and removal percentage of AB40 and RB4 was increased with increasing in contact time. The adsorption of dyes on modified straw surface was favorable at high acidic condition and desorption was found relatively low upon exposing to the desorption agent (i.e water). Dynamic experiment revealed that the kinetic data fitted well to the pseudo-second-order model for both of the dyes. The isotherm study also indicated that RB4 and AB40 adsorption suited well with the Langmuir model, The maximum adsorption capacity determined from the Langmuir isotherm at 25°C was 51.95 mg g−1 and 31.5 for AB40 and RB4, respectively.
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 03-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2000
DOI: 10.1039/B007475F
Publisher: Elsevier BV
Date: 03-2006
DOI: 10.1016/J.JCIS.2005.08.006
Abstract: MCM-22 was employed as an effective adsorbent for removal of basic dyes including methylene blue, crystal violet, and rhodamine B from aqueous solution. The adsorption kinetics and isotherms were investigated. The adsorption capacity of MCM-22 for three dyes follows an order of MB > CV approximately RB. Kinetic studies indicate that the adsorption follows the pseudo second-order kinetics and the adsorption is a two-step diffusion process with film diffusion dominating the process. The adsorption isotherm can be well fitted by both the Langmuir and the Freundlich models. Thermodynamic calculations suggest that the adsorption of basic dyes on MCM-22 is an endothermic reaction.
Publisher: American Chemical Society (ACS)
Date: 02-08-2023
Publisher: American Chemical Society (ACS)
Date: 05-09-2022
Abstract: In electrochemical advanced oxidation processes (EAOPs), the rate-limiting step is the mass transfer of pollutants to the electrodes due to the limited active surface areas. To this end, we established a three-dimensional (3D) EAOP system by coupling conventional graphite electrodes with dispersed carbon nanotubes (CNTs). The electrodes (particularly the anode) induced electric field spontaneously polarized CNTs into dispersed reactive particle electrodes (CNT-PEs) in the solution, which remarkably promoted electrochemical activation of peroxydisulfate (PDS) to generate surface CNT-PDS* complexes and surface-bound radicals (SBRs). Based on the excited potential (
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier
Date: 2007
Publisher: Elsevier BV
Date: 11-2003
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA00305K
Abstract: MIL-96(Al)–Ca1 shows the highest CO 2 adsorption capacity while MIL-96(Al)–Ca4 displays a distinguished morphology with the highest selectivity of CO 2 /N 2 .
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 11-2019
DOI: 10.1016/J.JCIS.2019.07.066
Abstract: Hydrogen generation from biomass reforming via solar energy utilisation has become a fascinating strategy toward future energy sustainability. In this study, ZnS nanoparticles with an average size around 10-15 nm were synthesised by a facile hydrothermal method, and then hybridised with g-C
Publisher: American Chemical Society (ACS)
Date: 1996
DOI: 10.1021/EF950227T
Publisher: Elsevier BV
Date: 08-2013
Publisher: Elsevier BV
Date: 2016
DOI: 10.1016/J.JHAZMAT.2015.08.031
Abstract: Two-dimensional reduced graphene oxide (2D rGO) was employed as both a shape-directing medium and support to fabricate 2D γ-MnO2/2D rGO nano-hybrids (MnO2/rGO) via a facile hydrothermal route. For the first time, the 2D/2D hybrid materials were used for catalytic ozonation of 4-nitrophenol. The catalytic efficiency of MnO2/rGO was much higher than either MnO2 or rGO only, and rGO was suggested to play the role for promoting electron transfers. Quenching tests using tert-butanol, p-benzoquinone, and sodium azide suggested that the major radicals responsible for 4-nitrophenol degradation and mineralization are O2(-) and (1)O2, but not ·OH. Reusability tests demonstrated a high stability of the materials in catalytic ozonation with minor Mn leaching below 0.5 ppm. Degradation mechanism, reaction kinetics, reusability and a synergistic effect between catalytic ozonation and coupling peroxymonosulfate (PMS) activation were also discussed.
Publisher: Elsevier
Date: 2007
Publisher: Elsevier BV
Date: 2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA07443F
Abstract: A novel molecular-imprinted electrochemical sensor based on gold nanoparticles decorating polyoxometalate (H 3 PW 12 O 40 )/reduced graphene oxide was developed for determination of trace TCS in wastewater.
Publisher: Elsevier BV
Date: 15-10-2010
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 10-2016
DOI: 10.1016/J.JCIS.2016.07.017
Abstract: A novel pipette-tip based on nano-sized dummy molecularly imprinted polymer (PT-DMIP) assisted by ultrasonication for the effective enrichment and analysis of prednisolone from urine s les was developed. The PT-DMIP cartridge was prepared by packing the dummy molecularly imprinted polymer at the tip of the micropipette. The polymerization used betamethasone (BM) as the dummy template, 3-aminopropyltrimethoxysilane (APTMS) as the functionalized monomer, tetraethyl orthosilicate (TEOS) as the cross-linker and aluminum ion (Al(3+)) as a dopant to produce Lewis acid sites in the silica matrix for metal coordinative interactions with the analyte. Compared to conventional solid phase extraction (SPE), the PT-DMIP is cost-effective, fast, and easy to handle, while the system is very approachable and reduces the consumption of toxic organic solvent. HPLC-UV analysis revealed successful applicability of the sorbent for highly efficient extraction of perdnisolone from urine matrices. The extraction recovery was investigated and optimum conditions were obtained using central composite design. Good linearity for prednisolone in the range of 0.22-220μgL(-1) with regression coefficients of 0.99 reveals high applicability of the method for trace analysis. Under the optimized conditions, the recoveries are 89.0-96.1 with relative standard deviations (RSD) of less than 9.0%.
Publisher: Springer Science and Business Media LLC
Date: 17-08-2023
DOI: 10.1038/S41467-023-40691-2
Abstract: Iron-based catalysts are promising candidates for advanced oxidation process-based wastewater remediation. However, the preparation of these materials often involves complex and energy intensive syntheses. Further, due to the inherent limitations of the preparation conditions, it is challenging to realise the full potential of the catalyst. Herein, we develop an iron-based nanomaterial catalyst via soft carbon assisted flash joule heating (FJH). FJH involves rapid temperature increase, electric shock, and cooling, the process simultaneously transforms a low-grade iron mineral (FeS) and soft carbon into an electron rich nano Fe 0 /FeS heterostructure embedded in thin-bedded graphene. The process is energy efficient and consumes 34 times less energy than conventional pyrolysis. Density functional theory calculations indicate that the electron delocalization of the FJH-derived heterostructure improves its binding ability with peroxydisulfate via bidentate binuclear model, thereby enhancing ·OH yield for organics mineralization. The Fe-based nanomaterial catalyst exhibits strong catalytic performance over a wide pH range. Similar catalysts can be prepared using other commonly available iron precursors. Finally, we also present a strategy for continuous and automated production of the iron-based nanomaterial catalysts.
Publisher: Wiley
Date: 12-05-2022
Abstract: Among various advanced oxidation processes, coupled photocatalysis and heterogeneous Fenton‐like catalysis (known as photo‐Fenton‐like catalysis) to generate highly reactive species for environmental remediation has attracted wide interests. As an emerging metal‐free photocatalyst, graphitic carbon nitride (g‐C 3 N 4 , CN) has been recently recognized as a promising candidate to catalyze robustly heterogeneous photo‐Fenton‐like reactions for wastewater remediation. This review summarizes recent progress in fabricating various types of CN‐based catalysts for the photo‐Fenton‐like reaction process. Innovative engineering strategies on the CN matrix are outlined, ranging from morphology control, defect engineering, nonmetal atom doping, organic molecule doping to modification by metal‐containing species. The photo‐Fenton‐like catalytic activities of CN loaded with auxiliary sub‐nanoscale (e.g., quantum dots, organometallic molecules, metal cations, and single atom metals) and nanoscale metal‐based materials are critically evaluated. Hybridization of CN with bandgap‐matching semiconductors for the construction of type‐II and Z‐scheme heterojunctions are also examined. The critical factors (e.g., morphology, dimensionality, light absorption, charge excitation/migration, catalytic sites, H 2 O 2 generation and activation) that determine the performance of CN‐based photocatalysts in Fenton‐like catalysis are systematically discussed. After examining the structure–activity relationship, research perspectives are proposed for further development of CN‐based photocatalysts toward more efficient photo‐Fenton‐like reactions and their application in practical water treatment.
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 07-2013
DOI: 10.1016/J.JCIS.2013.03.070
Abstract: A cobalt hydroxide (Co(OH)2) nanoflake-reduced graphene oxide (rGO) hybrid was synthesized by a one-pot hydrothermal method using glucose as a reducing agent for graphene oxide (GO) reduction. The structural and surface properties of the material were investigated by scanning and transmission electron microscopies, energy-dispersive X-ray spectrometry, powder X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Catalytic activities of GO, rGO, Co(OH)2 and Co(OH)2-rGO in aqueous phenol degradation using peroxymonosulfate as an oxidant were compared. A synergetic effect on the catalytic activity was found on the Co(OH)2-rGO hybrid. Although rGO has weak catalytic activity, Co(OH)2-rGO hybrid showed a higher catalytic activity than Co(OH)2. The phenol degradation on Co(OH)2-rGO was extremely fast and took around 10 min for 100% phenol removal. The degradation was found to follow the first order kinetics and a mechanism for phenol degradation was presented.
Publisher: Wiley
Date: 11-2019
DOI: 10.1002/APJ.2372
Publisher: Elsevier BV
Date: 07-2017
DOI: 10.1016/J.JCIS.2017.03.073
Abstract: One dimensional Fe
Publisher: American Chemical Society (ACS)
Date: 24-06-2004
DOI: 10.1021/EF0340716
Publisher: Elsevier BV
Date: 10-2018
DOI: 10.1016/J.JCIS.2018.05.088
Abstract: Platinum (Pt) free micro/nanomotors (MNMs) using a low content of fuels are highly desired for many applications. Herein, we demonstrate that cathodic electrofabrication can produce modified MnO
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7QM00059F
Abstract: Fe 3 O 4 @C microboxes with core–shell, yolk–shell and hollow structures were synthesized, the core–shell microboxes exhibited high specific capacity, good rate performance, and exceptional cycling stability.
Publisher: Wiley
Date: 2000
DOI: 10.1002/1097-4660(200007)75:7<589::AID-JCTB241>3.0.CO;2-7
Publisher: Elsevier BV
Date: 2005
DOI: 10.1016/J.WATRES.2004.09.011
Abstract: Fly ash and red mud have been employed as adsorbents for the removal of a typical basic dye, methylene blue, from aqueous solution. Heat treatment and chemical treatment have also been applied to the as-received fly ash and red mud s les. It is found that fly ash generally shows higher adsorption capacity than red mud. The raw fly ash and red mud show adsorption capacity at 1.4 x 10(-5) and 7.8 x 10(-6) mol/g, respectively. Heat treatment reduces the adsorption capacity for both fly ash and red mud but acid treatment by HNO(3) induces a different effect on fly ash and red mud. Nitric acid treatment results in an increase in adsorption capacity of fly ash (2.4 x 10(-5) mol/g) while it decreases the adsorption capacity for red mud (3.2 x 10(-6) mol/g). The adsorption data have been analysed using Langmuir, Freundlich and Redlich-Peterson isotherms. The results indicate that the Redlich-Peterson model provides the best correlation of the experimental data. Isotherms have also been used to obtain the thermodynamic parameters such as free energy, enthalpy and entropy of adsorption. For fly ash and red mud, adsorption of methylene blue is endothermic reaction with DeltaH(0) at 76.1 and 10.8 kJ/mol, respectively.
Publisher: American Chemical Society (ACS)
Date: 21-02-2013
DOI: 10.1021/IE302326H
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 11-11-2011
Publisher: Elsevier BV
Date: 10-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TA01926H
Abstract: Ordered macroporous carbon nitride supported single-atom Co catalysts with Co–N 1+3 /Co–N 2+2 geometric structures are developed using a spatial confinement strategy for (photo-)Fenton-like catalytic reactions.
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 15-04-2010
DOI: 10.1016/J.BIOS.2010.01.011
Abstract: A sensitive and reliable assay has been developed to directly screen DNA-targeted anticancer drugs in vitro via using resonance light scattering (RLS) technique. The results of experiments displayed that the increment of RLS intensity was directly proportional to the antitumor effect of anticancer drugs. Through the RLS spectra, the activities of four drugs have been demonstrated as mitoxantrone (MIT)>epirarubicin (EPI)>daunorubicin (DAU)>adriamycin (ADM). However, to further verify the activities of the above four drugs, binding constant (k) for each of them has been calculated by RLS technique as follows: k(RLS) (MIT, 8.75 x 10(5) L mol(-1))>k(RLS) (EPI, 6.58 x 10(5) L mol(-1))>k(RLS) (DAU, 4.79 x 10(5) L mol(-1))>k(RLS) (ADM, 3.82 x 10(5) L mol(-1)). Also, this RLS assay result was validated by seasoned vitro screening methods for anticancer drugs. In all, the proposed RLS is not only a simple, sensitive, objective and straightforward method, but also it is an unprecedented assay for primarily screening DNA-targeted anticancer drugs.
Publisher: Elsevier BV
Date: 03-2018
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.WATRES.2016.05.065
Abstract: Iron nanoparticles (NPs) encapsulated in B, N-codoped carbon nanotubes (Fe@C-BN) as heterogeneous Fenton-like catalysts were obtained by a simple and scalable pyrolysis method, and their performances were examined in the oxidative degradation of various organics in the presence of the different oxidants. The results showed that organic dyes can be effectively degraded by Fe@C-BN in the presence of peroxymonosulfate. Calcination temperature and mass of iron salt significantly affected the structures and performances of the catalysts. The effects of several reaction conditions, such as initial dye concentration, oxidant type (peroxymonosulfate, peroxydisulfate, and H2O2) and dosage, initial pH, inorganic anions, reaction temperature and dye types on oxidation as well as the stability of the composite were extensively evaluated in view of the practical applications. Through the investigation of reaction processes, HO(·) and SO4(·-) radicals were identified using quenching experiments. Owing to the synergistic effects between the iron NPs and B, N-doped carbon, Fe@C-BN catalysts intrinsically display an excellent catalytic activity for Fenton-like reaction. This study gives new insights into the design and preparation of iron NPs encapsulated in B, N-codoped carbon nanotubes as an effective strategy to enhance the overall catalytic activity.
Publisher: Public Library of Science (PLoS)
Date: 17-01-2012
Publisher: Springer Science and Business Media LLC
Date: 1999
Publisher: Elsevier BV
Date: 08-2006
DOI: 10.1016/J.JCIS.2006.03.062
Abstract: Adsorbents from coal fly ash treated by a solid-state fusion method using NaOH were prepared. It was found that amorphous aluminosilicate geopolymers would be formed. These fly ash-derived inorganic polymers were assessed as potential adsorbents for removal of some basic dyes, methylene blue and crystal violet, from aqueous solution. It was found that the adsorption capacity of the synthesised adsorbents depends on the preparation conditions such as NaOH:fly-ash ratio and fusion temperature with the optimal conditions being at 1.2:1 weight ratio of Na:fly-ash at 250-350 degrees C. The synthesised materials exhibit much higher adsorption capacity than fly ash itself and natural zeolite. The adsorption isotherm can be fitted by Langmuir and Freundlich models while the two-site Langmuir model producing the best results. It was also found that the fly ash derived geopolymeric adsorbents show higher adsorption capacity for crystal violet than methylene blue and the adsorption temperature influences the adsorption capacity. Kinetic studies show that the adsorption process follows the pseudo second-order kinetics.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Informa UK Limited
Date: 12-2018
DOI: 10.2147/DDDT.S182983
Publisher: Elsevier BV
Date: 10-2012
Publisher: Elsevier BV
Date: 06-2015
DOI: 10.1016/J.JHAZMAT.2015.02.042
Abstract: N-doped TiO2/ZnFe2O4 catalysts were successfully prepared by coupling nitrogen modified TiO2 with ZnFe2O4 via a one-pot vapor-thermal method. The physicochemical properties of the as-prepared catalysts have been characterized using various spectroscopic and microscopic techniques. The UV-vis-light-driven photocatalytic activities of the hybrids were evaluated and the effects of the amount of photocatalyst, different types of dyes, catalyst stability on photodegradation of organic dyes were investigated. Moreover, degradation kinetics and mechanism as well as the roles of N doping, ZnFe2O4 and TiO2 have been analyzed. It was revealed that N-doped TiO2/ZnFe2O4 exhibited an improved performance compared with TiO2/ZnFe2O4 or ZnFe2O4 because of the formation of a heterostructure at the interface as well as the introduction of N species. Active species such as holes, electrons, hydroxyl radicals, and superoxide radicals involved in the photodegradation process were detected by using different types of scavengers. Because of ZnFe2O4 in the hybrid, the catalyst shows ferromagnetism, and thus, the hybrid catalyst is easily isolated from the reaction mixture after the photocatalytic experiments. This work not only offers a simple method for the fabrication of N doped TiO2/ZnFe2O4 hybrids, but also provides an effective and conveniently recyclable photocatalyst for the purification of water.
Publisher: Elsevier BV
Date: 11-2018
DOI: 10.1016/J.JCIS.2018.05.077
Abstract: An N-doped carbon nanofiber cloth (CC) with anchored nickel nanoparticles (Ni@N-CC) was synthesized from a facile pyrolysis process and employed as a catalyst to oxidize target contaminants using peroxydisulfate (PDS) as both radical precursors and electron acceptors. An effective strategy was developed to control the porous structures and catalytic performances by optimizing the precursor weights and pyrolysis temperatures for Ni@N-CC preparation. The optimal temperature was 700 °C, and the best dicyanodiamine mass was 1.0 g. Ni@N-CC was found to be superior for PDS activation to CC and nickel nanoparticles (NPs), ascribing to highly active sites, intimate connection between the nickel NPs and highly conductive N-doped CC, as well as the formed three-dimensional architecture. The oxidation rates were influenced by the oxidant loading (0.185-1.11 mM), initial organics concentration (10-50 mg/L), temperature (5-45 °C), pH (2.65-10.47), and inorganic anions. Furthermore, mechanistic investigations using various probe reagents and spin trapping technique identified the generation of several active species for oxidation. The reaction was found to proceed via the electron transfer mediation from organics to PDS on N-doped CC and one electron reduction of PDS on Ni
Publisher: Springer Science and Business Media LLC
Date: 20-09-2017
DOI: 10.1007/S11356-017-0111-2
Abstract: In this article, Cr(OH)
Publisher: Elsevier
Date: 2007
Publisher: American Chemical Society (ACS)
Date: 09-02-2015
DOI: 10.1021/AM508416N
Abstract: N-Doped graphene (NG) nanomaterials were synthesized by directly annealing graphene oxide (GO) with a novel nitrogen precursor of melamine. A high N-doping level, 8-11 at. %, was achieved at a moderate temperature. The s le of NG-700, obtained at a calcination temperature of 700 °C, showed the highest efficiency in degradation of phenol solutions by metal-free catalytic activation of peroxymonosulfate (PMS). The catalytic activity of the N-doped rGO (NG-700) was about 80 times higher than that of undoped rGO in phenol degradation. Moreover, the activity of NG-700 was 18.5 times higher than that of the most popular metal-based catalyst of nanocrystalline Co3O4 in PMS activation. Theoretical calculations using spin-unrestricted density functional theory (DFT) were carried out to probe the active sites for PMS activation on N-doped graphene. In addition, experimental detection of generated radicals using electron paramagnetic resonance (EPR) and competitive radical reactions was performed to reveal the PMS activation processes and pathways of phenol degradation on nanocarbons. It was observed that both (•)OH and SO4(•-) existed in the oxidation processes and played critical roles for phenol oxidation.
Publisher: Elsevier BV
Date: 09-2017
DOI: 10.1016/J.JHAZMAT.2017.05.026
Abstract: Iron nanoparticles (NPs) embedded in S, N-codoped carbon were prepared by one-step pyrolysis of a homogeneous mixture consisting of Fe, S, N, C precursors, and then immobilized in poly (vinylidene fluoride) membranes as a multifunctional catalytic system (NSC-Fe@PVDF) to effectively activate peroxymonosulfate (PMS) and oxidize organic compounds in water. The NSC-Fe@PVDF membranes effectively decolorized organic pollutants at a wide pH range (2.05-10.85), due to the synergistic effects between the S, N-doped carbon and iron NPs. The efficiency depended on the doping types, amount of metal, PMS dosages, reaction temperatures, solution pHs, and organic substrates. In-situ electron spin resonance spectroscopy and sacrificial-reagent incorporated catalysis indicate radical intermediates such as sulfate and hydroxyl radicals are mainly responsible for this persulfate-driven oxidation of organic compounds. Membrane's porous structure and high internal surface area not only minimize the NPs agglomeration, but also allow the facile transport of catalytic reactants to the active surface of metal catalysts. The results demonstrate the morphological and structural features of catalytic membranes enhance the overall catalytic activity.
Publisher: Elsevier BV
Date: 11-1999
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NR03157K
Abstract: N-Doped graphene-like carbon was prepared via a metal-free method. Electrophilic oxygen and nitrogen species functioned as dual active sites to activate peroxymonosulfate to convert alcohol into aldehyde or ketone by radical and non-radical routes.
Publisher: American Chemical Society (ACS)
Date: 09-03-2001
DOI: 10.1021/EF000205T
Publisher: Wiley
Date: 17-01-2018
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 07-2007
DOI: 10.1016/J.ENVINT.2007.02.011
Abstract: Volatile organic compounds (VOCs) are the major pollutants in indoor air, which significantly impact indoor air quality and thus influencing human health. A long-term exposure to VOCs will be detrimental to human health causing sick building syndrome (SBS). Photocatalytic oxidation of VOCs is a cost-effective technology for VOCs removal compared with adsorption, biofiltration, or thermal catalysis. In this paper, we review the current exposure level of VOCs in various indoor environment and state of the art technology for photocatalytic oxidation of VOCs from indoor air. The concentrations and emission rates of commonly occurring VOCs in indoor air are presented. The effective catalyst systems, under UV and visible light, are discussed and the kinetics of photocatalytic oxidation is also presented.
Publisher: Elsevier BV
Date: 10-2011
Publisher: Elsevier BV
Date: 08-2016
DOI: 10.1016/J.JHAZMAT.2016.03.089
Abstract: Magnetic metal M (M=Fe, Co, Ni) nanocrystals encapsulated in nitrogen-doped carbon nanotubes (M@N-C) were fabricated conveniently using dicyandiamide as a C/N precursor, and exhibited varying activities toward Fenton-like reaction. The surface morphology and structure of the M@N-C catalysts were characterized and an efficient catalytic degradation performance, high stability, and excellent reusability were observed. In addition, several operational factors, such as initial dye concentration, oxidant type (peroxymonosulfate, peroxydisulfate and H2O2) and dosage, reaction temperature, and dye type as well as stability of the composite were extensively evaluated in view of the practical applications. The results showed that various transition metals M significantly affected the structures and performances of the catalysts, and specially, their activity followed the order of Co>Fe>Ni in the presence of peroxymonosulfate. Moreover, HO and SO4(-) radicals participating in the process were evidenced using quenching experiments, and a rational mechanism was proposed based on a non-radical process and the free radical process. Control experiments revealed that the enhanced active sites were mainly ascribed to the synergistic effects between the metal nanocrystals and nitrogen-doped carbon. The findings of this study elucidated that encapsulation of nanocrystals in nitrogen-doped carbon nanotubes was an effective strategy to enhance the overall catalytic activity.
Publisher: American Chemical Society (ACS)
Date: 23-04-2021
Publisher: Elsevier BV
Date: 06-2012
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.CHEMOSPHERE.2016.06.021
Abstract: Novel uniform ellipsoid α-Mn2O3@α-MnO2 core/shell (McMs) nanocomposites were prepared via a hydrothermal process with a shape-control protocol followed by calcination at different temperatures. The properties of the composites were characterized by a number of techniques such as thermogravimetric analysis (TGA), X-ray diffraction (XRD), N2 adsorption, and scanning electron microscopy (SEM). The core/shell materials were much effective in heterogeneous oxone(®) activation to generate sulfate and hydroxyl radicals for degradation of aqueous phenol. The McMs composites demonstrated catalytic activity for 100% phenol decomposition in short duration varying between 20 and 120 min, much higher than that of homogeneous Mn(2+) system with 95% phenol degradation in 120 min. They also showed a higher activity than single-phase α-Mn2O3 or α-MnO2. The catalytic activity of phenol degradation depends on temperature, oxone(®) concentration, phenol concentration, and catalyst loading. The catalysts also showed a stable activity in several cycles. Kinetic study demonstrated that phenol degradation reactions follow a first order reaction on McMs catalysts giving activation energies at 32.1-68.8 kJ/mol. With the detection of radicals by electron paramagnetic resonance (EPR), the generation mechanism was proposed.
Publisher: American Chemical Society (ACS)
Date: 25-09-2014
DOI: 10.1021/AM503820H
Abstract: Carbon nitride (C3N4) is a layered, stable, and polymeric metal-free material that has been discovered as a visible-light-response photocatalyst. Owing to C3N4 having a higher conduction band position, most previous studies have been focused on its reduction capability for solar fuel production, such as hydrogen generation from water splitting or hydrocarbon production from CO2. However, photooxidation ability of g-C3N4 is weak and has been less explored, especially for decomposition of chemically stable phenolics. Carbon spheres prepared by a hydrothermal carbonization of glucose have been widely applied as a support material or template due to their interesting physicochemical properties and the functional groups on the reactive surface. This study demonstrated that growth of carbon nanospheres onto g-C3N4 (CN-CS) can significantly increase the photooxidation ability (to about 4.79 times higher than that of pristine g-C3N4) in phenol degradation under artificial sunlight irradiations. The crystal structure, optical property, morphology, surface groups, recombination rate of electron/hole pairs, and thermal stability of CN-CS were investigated by a variety of characterization techniques. This study contributes to the further promising applications of carbon nitride in metal-free catalysis.
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 06-2020
Publisher: Wiley
Date: 26-11-2019
Abstract: For the first time, colloidal gold (Au)-ZnSe hybrid nanorods (NRs) with controlled size and location of Au domains are synthesized and used for hydrogen production by photocatalytic water splitting. Au tips are found to grow on the apices of ZnSe NRs nonepitaxially to form an interface with no preference of orientation between Au(111) and ZnSe(001). Density functional theory calculations reveal that the Au tips on ZnSe hybrid NRs gain enhanced adsorption of H compared to pristine Au, which favors the hydrogen evolution reaction. Photocatalytic tests reveal that the Au tips on ZnSe NRs effectively enhance the photocatalytic performance in hydrogen generation, in which the single Au-tipped ZnSe hybrid NRs show the highest photocatalytic hydrogen production rate of 437.8 µmol h
Publisher: Elsevier BV
Date: 02-2021
Publisher: American Chemical Society (ACS)
Date: 11-12-2020
Publisher: Wiley
Date: 1999
Abstract: CO 2 is a major greenhouse gas, but it is also an important source of carbon. Catalytic reforming of methane with CO 2 to synthesis gas is a promising technology in utilisation of CO 2 . This process has attracted increasing attention among the research communities in the world, and much progress has been made. This paper presents an overview on the recent advances in catalyst development, reaction mechanism and kinetics. It is found that catalytic activity and stability strongly depend on the nature of support, metal‐support interaction, metal precursor and addition of promoters. Further fundamental research on the reaction and coking mechanisms and kinetics will lead to a high performance catalyst system that will deliver high conversion at low temneratures and with lone‐term cokine‐free oDeration.
Publisher: Walter de Gruyter GmbH
Date: 14-07-2017
DOI: 10.3139/113.110511
Abstract: The implementation of nanotechnology in all industries is one of most significant research fields. Nanoparticles have shown a promising application in subsurface fields. On the other hand, various surfactants have been used in the oil industry to reduce oil/water interfacial tension and also widely used to stabilize the nano-suspensions. The primary objective of this study was to investigate the improvements of surfactants ability in term of interfacial tension (γ) reduction utilizing addition of silicon dioxide nanoparticles at different temperatures and salinity. The pendant drop technique has been used to measure γ and electrical conductivity has been used to measure the critical micelle concentration (CMC). The synergistic effects of surfactant-nanoparticles, salt-nanoparticles, and surfactant-salt-nanoparticles on γ reduction and the critical micelle concentration of the surfactants have been investigated. Extensive series of experiments for γ and CMC measurements were performed. The optimum condition for each formulation is shown. We conclude that nanoparticles-surfactant can significantly reduce γ if correctly formulated.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA04885E
Abstract: Amorphous boron is employed as a novel and high-performance metal-free catalyst for activation of peroxymonosulfate for degrading various organic contaminants in water.
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 09-2009
DOI: 10.1016/J.BIORTECH.2009.03.063
Abstract: A barley straw was modified by a surfactant, cetylpyridinium chloride, and used as an adsorbent for acid (acid blue 40) and reactive dye (reactive black 5) adsorption in aqueous solution. Characterization of the modified barley straw was performed using N(2) adsorption, titration, and FT-IR analysis. It was found that the surfactant modified barley straw exhibits higher adsorption to acid blue 40 than reactive black 5 and adsorption of the dyes is influenced by several parameters such as dye initial concentration, adsorbent dosage, solution pH, and adsorption temperature. Adsorption isotherms show that maximum adsorption of acid blue 40 and reactive black 5 is 1.02x10(-4) and 2.54x10(-5) mol/g, respectively. Desorption studies show that both dyes are strongly bounded with the adsorbent and exhibit low desorption.
Publisher: Springer Science and Business Media LLC
Date: 14-08-2016
DOI: 10.1007/S11356-016-7329-2
Abstract: Low-cost catalysts with high activity and stability toward producing strongly oxidative species are extremely desirable, but their development still remains a big challenge. Here, we report a novel strategy for the synthesis of a magnetic CoFe
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EN01237H
Abstract: MoS 2 NFs have exhibited abundant active sites in odd-number layers to piezoelectrically activate PMS for producing ˙OH and SO 4 ˙ − in order to degrade organic pollutants.
Publisher: Elsevier BV
Date: 12-2018
Publisher: MDPI AG
Date: 14-03-2017
DOI: 10.3390/NANO7030064
Publisher: Royal Society of Chemistry (RSC)
Date: 1999
DOI: 10.1039/A808708C
Publisher: American Chemical Society (ACS)
Date: 15-06-2020
Publisher: Elsevier BV
Date: 06-2017
DOI: 10.1016/J.JCIS.2017.01.121
Abstract: It finds that CQDs synthesized by hydrothermal method possess obvious upconversion properties that could transfer low energy photons to high energy photons, resulting in enhanced visible light response and utilization. Herein, carbon quantum dots (CQDs) modified TiO
Publisher: Elsevier BV
Date: 04-2012
Publisher: American Chemical Society (ACS)
Date: 09-09-2022
Abstract: In this study, a wet scrubber coupled with a persulfate-based advanced oxidation process [carbocatalysts eroxymonosulfate (PMS)] was demonstrated to efficiently remove gaseous volatile organic compounds (VOCs). The removal efficiency of a representative VOC, styrene, was stable at above 98%, and an average mineralization rate was achieved at 76% during 2 h. The removal efficiency of the carbocatalysts/PMS wet scrubber for styrene was much higher than that of pure water, carbocatalysts/water, or PMS/water systems. Quenching experiments, electron spin resonance spectroscopy, in-situ Raman spectroscopy and density functional theory (DFT) calculations indicated that singlet oxygen (
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC00946E
Abstract: In situ formation of CoOH + –hydroxyapatite@C via ion exchange between Ca and Co realises the simultaneous adsorption of Co 2+ and catalytic peroxymonosulfate oxidation for superfast oxidative degradation of organic contaminants.
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 04-2020
Publisher: Wiley
Date: 10-02-2022
Abstract: A main hurdle for the commercial application of lithium–sulfur (Li–S) batteries lies in inadequate loading of sulfur due to a huge volume change over charging–discharging, poor electric conductivity of sulfur and associated sulfides, and the shuttling effect of lithium polysulfides (LiPS). Herein, a universal “three‐region” configuration including: Region I (sulfur source region), Region II (LiPS electrocatalysis region), and Region III (multi‐functional shield) for high‐areal capacity Li–S batteries is proposed. Mechanism of the configuration including the competitive relationship between Region II and Region III based on the Sabatier principle is further confirmed through density functional theory theoretical simulation and a series of in situ experimental methods. Compared with a conventional mechanical mixing electrode structure, it is demonstrated that the orderly integration “three‐region” configuration is able to prevent shuttling of LiPS effectively, which delivers high gravimetric energy density at the sulfur loading of 10.7 mg cm −2 . Furthermore, a pouch cell achieves a high capacity of 148.15 mAh at a sulfur loading of 108 mg, which is by far higher than that of most previous batteries and pouch Li–S cells. Impressively, with bending and even partial damage, the pouch cell can still work normally, showing considerable safety.
Publisher: American Chemical Society (ACS)
Date: 02-07-2021
Publisher: Springer Science and Business Media LLC
Date: 10-05-2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA12960H
Publisher: Spandidos Publications
Date: 22-11-2012
Abstract: Fatal familial insomnia (FFI) is an autosomal dominant prion disease clinically characterized by rapidly progressive insomnia, prominent autonomic alterations and behavioral disturbance. The D178N mutation of the prion protein gene (PRNP) on chromosome 20 in conjunction with methionine at codon 129 is a molecular feature. Although the neuropathological characteristics of FFI are well documented, the neuropathologic and pathogenic features of FFI patients remain poorly understood. Six brain regions of postmortem brains from 3 FFI patients were examined using immunohistochemistry, western blot analyses and quantitative real-time PCR. In all 3 brain specimens, reactive astrogliosis was found to be more severe in the thalamus than in the cortex regions. Western blot analyses showed that all three brains expressed PrP, but only 2 were associated with significantly weak proteinase K (PK) resistance. However, the conformational stabilities of PrPSc in the 3 FFI brains were significantly weaker than those presented in a G114V genetic Creutzfeldt-Jakob disease (gCJD) case. Immunohistochemistry and western blot analyses showed comparable amounts of neuron-specific enolase (NSE)-positive stained cells and NSE protein among the different regions in the three brains. In addition, the transcriptional levels of glial fibrillary acidic protein (GFAP) and NSE-specific mRNAs were coincident with the expression of these proteins. In conclusion, in the present study, we described the detailed regional neuropathology of FFI cases.
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 05-2011
DOI: 10.1016/J.JCIS.2011.01.092
Abstract: Organic carbon aerogels (CAs) were prepared by a sol-gel method from polymerisation of resorcinol, furfural, and hexamethylenetetramine catalysed by KOH at around pH 9 using ambient pressure drying. The effect of KOH in the sol-gel on CA synthesis was studied. It was found that addition of KOH prior to the sol-gel polymerisation process improved thermal stability of the gel, prevented the crystallinity of the gel to graphite, increased the microporosity of CA and promoted activation of CA. The CAs prepared using the KOH catalyst exhibited higher porosity than uncatalysed prepared s les. Activation in CO(2) at higher temperature also enhanced the porosity of CAs. Adsorption tests indicated that the CAs were effective for both basic and acid dye adsorption and the adsorption increased with increasing surface area and pore volume. The kinetic adsorption of dyes was diffusion control and could be described by the second-order kinetic model. The equilibrium adsorption of dyes was higher than activated carbon.
Publisher: Elsevier BV
Date: 10-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR00652A
Abstract: Strategies for modifying polymeric carbon nitrides and their intrinsic structure–activity relationships for photo-, electro-, and photoelectro-chemical water oxidation are discussed.
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 03-2018
DOI: 10.1016/J.JCIS.2017.12.066
Abstract: New photocatalytic materials for stable reduction and/or oxidization of water by harvesting a wider range of visible light are indispensable to achieve high practical efficiency in artificial photosynthesis. In this work, we prepared 2D WO
Publisher: Elsevier BV
Date: 06-2018
Publisher: American Chemical Society (ACS)
Date: 24-11-2022
Publisher: American Chemical Society (ACS)
Date: 21-08-2008
DOI: 10.1021/ES801312M
Abstract: Solid wastes, fly ash, and bottom ash are generated from coal and biomass combustion. Fly ash is mainly composed of various metal oxides and possesses higher thermal stability. Utilization of fly ash for other industrial applications provides a cost-effective and environmentally friendly way of recycling this solid waste, significantly reducing its environmental effects. On the one hand, due to the higher stability of its major component, aluminosilicates, fly ash could be employed as catalyst support by impregnation of other active components for various reactions. On the other hand, other chemical compounds in fly ash such as Fe2O3 could also provide an active component making fly ash a catalyst for some reactions. In this paper, physicochemical properties of fly ash and its applications for heterogeneous catalysis as a catalyst support or catalyst in a variety of catalytic reactions were reviewed. Fly-ash-supported catalysts have shown good catalytic activities for H2 production, deSO(x), deNO(x), hydrocarbon oxidation,and hydrocracking, which are comparable to commercially used catalysts. As a catalyst itself, fly ash can also be effective for gas-phase oxidation of volatile organic compounds, aqueous-phase oxidation of organics, solid plastic pyrolysis, and solvent-free organic synthesis.
Publisher: Elsevier BV
Date: 15-06-2008
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA02446A
Abstract: Atomic Fe–N–C materials derived from pyridine deposition on Fe containing templates transfer electrons from C to Fe via C–N–Fe bonds to highly activate PMS to generate O 2 ˙ − for AOPs.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EN01216E
Abstract: This study used metal–organic-framework (MOF) derived In 2 O 3 for the photocatalytic degradation of PFOA for the first time. MOF derived In 2 O 3 demonstrated significantly enhanced performance for PFOA decomposition compared to commercial In 2 O 3 .
Publisher: Springer Science and Business Media LLC
Date: 24-03-2013
DOI: 10.1007/S12031-013-0002-Z
Abstract: Microglial cells are resident mononuclear phagocytes of the central nervous system (CNS). Active proliferation of microglia in the brain has been identified in neurodegenerative disorders, including some kinds of prion disease. However, the detailed regional distribution between microglia and PrP(Sc) deposition has not been presented, and investigation of fractalkine signaling which is involved in the regulation of activation of microglia in prion disease is not well documented. In this study, the disease phenomenon of microglial accumulation in the CNS was thoroughly analyzed using a scrapie-infected experimental model. Western blots of microglia-specific markers Iba1 and CD68, immunohistochemical and immunofluorescent assays demonstrated obviously activation of microglia in almost whole brain regions in the infected animals. Under the dynamic analysis on hallmarks of activation of microglia, a time-dependent increase of Iba1 and CD68 was detected, accompanied by accumulation of PrP(Sc) and progression of neurodegenerative symptoms. With serial brain sections and double staining of Iba1 and PrP(Sc), we observed that the microglia distributed around PrP(Sc) deposits in 263K-infected hamsters' brains, proposing PrP(Sc) phagocytosis. Flow cytometry assays with the single-cell suspensions prepared from the cortical region of the infected brains verified an activation of microglial population. ELISA assays of the cytokines in brain homogenates revealed significant upregulations of interleukin (IL)-1β, IL-6 and TNF-α when infected. Evaluation of fractalkine signaling in the infected hamsters' brains showed progressively downregulation of CX3CL1 during the incubation. Prion peptide PrP106-126 also disrupted fractalkine and evoked microglial activation in rat primary neuron-glia mixed cultures. Our data here demonstrate an activated status of microglia in CNS tissues of infectious prion disease, possibly through fractalkine signaling deficiency.
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 09-2021
Publisher: Inderscience Publishers
Date: 2009
Publisher: Elsevier BV
Date: 10-2015
DOI: 10.1016/J.JCIS.2015.06.003
Abstract: Graphitic carbon nitride (g-C3N4) is an emerging metal-free catalyst, and has attracted considerate research interests in photocatalysis. For improving the low photocatalytic activity due to the polymeric nature, a variety of methods have been developed. In this study, polyoxometalate (POMs) functionalized g-C3N4 were synthesized using a facile hydrothermal method as novel photocatalysts. The photocatalysts were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), N2 sorption isotherms, thermogravimetric analysis (TGA), and UV-vis diffusion reflectance spectroscopy (UV-vis DRS). The photocatalytic properties were evaluated in photodecomposition of aqueous methylene blue (MB) and phenol under UV-visible light irradiations. Compared to pristine g-C3N4, POMs modified s les demonstrated enhanced efficiencies in photodegradation of MB and phenol. It was suggested that increased specific surface area, porous volume and efficient charge transfer would be responsible for the improved photocatalysis. This study proves the promising role of POMs in modification of novel photocatalysts.
Publisher: Elsevier BV
Date: 05-2019
Publisher: Wiley
Date: 23-08-2010
DOI: 10.1002/APJ.506
Publisher: American Chemical Society (ACS)
Date: 17-04-2020
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 2020
DOI: 10.1016/J.JHAZMAT.2019.121059
Abstract: Porous FeVO
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 2007
Publisher: American Chemical Society (ACS)
Date: 12-11-2012
DOI: 10.1021/IE301642G
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 09-2017
Publisher: American Scientific Publishers
Date: 12-2017
Publisher: American Chemical Society (ACS)
Date: 06-01-2016
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 09-2019
DOI: 10.1016/J.JCIS.2019.05.054
Abstract: High-performance and low-cost photocatalysts are of significance to artificial photosynthetic systems for converting of CO
Publisher: American Chemical Society (ACS)
Date: 27-03-2020
Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.WATRES.2019.04.040
Abstract: Catalytic wet air oxidation (CWAO) is a clean process for the treatment of toxic and/or biorefractory contaminants while it is a challenge to perform the CWAO at room temperature. Herein, we report an electro-assisted CWAO (ECWAO) process using partially oxidized nickel (Ni@NiO) immobilized on a porous graphite felt (GF) as a catalytic anode. Such a process demonstrates extensive effectiveness and good stability in the deep oxidation of various organic pollutants including triclosan (TCS), bisphenol A, ciprofloxacin, sulfamethoxazole, congo red, crystal violent and rodamine B at room temperature. The typical pollutant TCS is rapidly degraded within 105 min with a mineralization efficiency of 86.0 ± 1.4%, at specific energy consumption of 5.3 ± 0.3 kW h kg-TOC
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 06-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CC43401J
Abstract: Nitrogen (5.61 at%) doped reduced graphene oxide synthesized via a facile method was demonstrated as a superior metal-free catalyst for activation of peroxymonosulfate. Codoping with boron would further enhance the catalytic activity and the stability, providing a promising green material for environmental remediation.
Publisher: Elsevier BV
Date: 05-2017
DOI: 10.1016/J.JCIS.2017.01.038
Abstract: Graphitic carbon nitride (g-C
Publisher: American Chemical Society (ACS)
Date: 11-06-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CY01967B
Abstract: Catalytic ozonation has attracted intensive attention due to its efficient degradation of various organic pollutants in water.
Publisher: Wiley
Date: 20-06-2017
Publisher: Elsevier BV
Date: 09-2020
Publisher: American Chemical Society (ACS)
Date: 17-12-2020
Abstract: Carbon-driven advanced oxidation processes are appealing in wastewater purification because of the metal-free feature of the carbocatalysts. However, the regime of the emerging nonradical pathway is ambiguous because of the intricate carbon structure. To this end, this study was dedicated to unveil the intrinsic structure-performance relationship of peroxydisulfate (PDS) activation by carbon nanotubes (CNTs) toward nonradical oxidation of organics such as phenol (PE) via electron transfer. Eighteen analogical CNTs were synthesized and functionalized with different categories and contents of oxygen species. The quenching tests and chronopotentiometry suggest that an improved reactivity of surface-regulated CNTs was attributed to the reinforced electron-transfer regime without generation of free radicals and singlet oxygen. The quantitative structure-activity relationships were established and correlated to the Tafel equation, which unveils the nature of the nonradical oxidation by CNT-activated PDS complexes (CNT-PDS*). First, a decline in the concentration of oxygen groups in CNTs will make the zeta potential of the CNT become less negative in neutral solutions, which facilitated the adsorption of PDS because of weaker electrostatic repulsion. Then, the metastable CNT-PDS* was formed, which elevated the oxidation capacity of the CNT. Finally, PE would be oxidized over CNT-PDS* via electron transfer to fulfill the redox cycle. Moreover, the nonradical oxidation rate was uncovered to be exponentially related with the potential of the complexes, suggesting that the nonradical oxidation by the CNT-PDS* undergoes a mechanism analogous to anodic oxidation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA11503G
Abstract: A Co single-atom catalyst on g-C 3 N 4 support was prepared for the selective oxidation of ethylbenzene (EB) to acetophenone (AcPO) by peroxymonosulfate (PMS). The Co atoms bonded with N were robust active sites for EB oxidation via the radical pathway.
Publisher: Wiley
Date: 13-05-2022
DOI: 10.1002/EEM2.12365
Abstract: Van der Waals (VDW) heterojunctions in a 2D/2D contact provide the highest area for the separation and transfer of charge carriers. In this work, a top‐down strategy with a gas erosion process was employed to fabricate a 2D/2D carbon nitride VDW heterojunction in carbon nitride (g‐C 3 N 4 ) with carbon‐rich carbon nitride. The created 2D semiconducting channel in the VDW structure exhibits enhanced electric field exposure and radiation absorption, which facilitates the separation of the charge carriers and their mobility. Consequently, compared with bulk g‐C 3 N 4 and its nanosheets, the photocatalytic performance of the fabricated carbon nitride VDW heterojunction in the water splitting reaction to hydrogen is improved by 8.6 and 3.3 times, respectively, while maintaining satisfactory photo‐stability. Mechanistically, the finite element method (FEM) was employed to evaluate and clarify the contributions of the formation of VDW heterojunction to enhanced photocatalysis, in agreement quantitatively with experimental ones. This study provides a new and effective strategy for the modification and more insights to performance improvement on polymeric semiconductors in photocatalysis and energy conversion.
Publisher: Wiley
Date: 14-02-2017
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.CHEMOSPHERE.2018.04.173
Abstract: Enhanced elimination of aniline in aqueous solution was achieved by coupling electrosorption of aniline and electrochemical activation of peroxydisulfate (PDS) at multi-walled carbon nanotube (MWCNT) cathode, in which a synergistic effect occurred. It was found that PDS could be effectively activated under a small voltage at MWCNT cathode owing to the specific pore structures of MWCNTs. A nonradical oxidation pathway instead of radical-based oxidation was proposed from the cathodic activation of PDS, wherein PDS molecules with a modified electronic structure was suggested to be the principal reactive species. Meanwhile, the influences of various operation parameters such as electrode potential, PDS concentration, presence of chloride ions on the elimination efficiency, and the stability of MWCNT electrode were also attempted. Therefore, the electrochemical activation of PDS by MWCNT cathode is a promising energy-saving method for the treatment of organic pollutants in wastewater.
Publisher: Elsevier BV
Date: 11-2015
Publisher: Elsevier BV
Date: 05-2009
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 10-2016
Publisher: American Chemical Society (ACS)
Date: 14-04-2017
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 02-2013
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 10-2020
Publisher: Wiley
Date: 08-02-2011
DOI: 10.1002/AIC.12295
Publisher: Elsevier BV
Date: 05-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA17696D
Abstract: Microbe-free broth synthesis was performed under solar light to give Ag nanoparticle embedded AgCl in 5 minutes with superior performance than P25 for organic pollutant degradation.
Publisher: Wiley
Date: 20-02-2009
DOI: 10.1002/APJ.265
Publisher: Elsevier BV
Date: 05-1998
Publisher: Wiley
Date: 03-08-2017
Publisher: Springer Science and Business Media LLC
Date: 25-01-2017
DOI: 10.1007/S11356-017-8440-8
Abstract: Novel iron encapsulated in nitrogen-doped carbon nanotubes (CNTs) supported on porous carbon (Fe@N-C) 3D structured materials for degrading organic pollutants were fabricated from a renewable, low-cost biomass, melamine, and iron salt as the precursors. SEM and TEM micrographs show that iron encapsulated bamboo shaped CNTs are vertically standing on carbon sheets, and thus, a 3D hybrid was formed. The catalytic activities of the prepared s les were thoroughly evaluated by activation of peroxymonosulfate for catalytic oxidation of Orange II solutions. The influences of some reaction conditions (pH, temperature, and concentrations of reactants, peroxymonosulfate, and dye) were extensively evaluated. It was revealed that the adsorption could enrich the pollutant which was then rapidly degraded by the catalytically generated radicals, accelerating the continuous adsorption of residual pollutant. Remarkable carbon structure, introduction of CNTs, and N/Fe doping result in promoted adsorption capability and catalytic performances. Due to the simple synthetic process and cheap carbon precursor, Fe@N-C 3D hybrid can be easily scaled up and promote the development of Fenton-like catalysts.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EN00347F
Abstract: Reliable criteria for identifying the intrinsic active sites in carbocatalysts to mediate an electron-transfer mechanism in persulfate activation are presented.
Publisher: Elsevier BV
Date: 12-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6SC04903F
Abstract: While bulk-sized metal–organic frameworks (MOFs) face limits to their utilization in various research fields such as energy storage applications, nanoarchitectonics is believed to be a possible solution.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2AN35405E
Abstract: In this paper, we reported the development of a highly sensitive and selective resonance light scattering (RLS) technique for glutathione using gold nanoparticle probes. The assay relies upon the distance-dependent optical properties of gold nanoparticles, the self-assembly of glutathione on gold nanoparticles, and the interaction of a 2 : 1 glutathione-Cu(2+) complex. In the presence of Cu(2+), glutathione could rapidly induce the aggregation of gold nanoparticles, thereby resulting in greatly enhanced RLS intensity and red-to-blue (or purple) color change. The concentration of glutathione can be determined by the naked eye or a fluorescence spectrometer. Under the optical conditions, the detection of glutathione can be finished within 20 min, and the detection limit of 10 nM can be reached. The concentration range of the probe is 40-280 nM. The proposed method holds a specific selectivity toward glutathione and it is applied to the detection of glutathione in human serum with satisfactory results. In addition, the assay shows great potential application for disease-associated biomarkers, and it will meet the great demand for amino acid determination in fields such as food processing, biochemistry, pharmaceutical, and clinical analysis.
Publisher: Elsevier BV
Date: 10-2018
Publisher: Spandidos Publications
Date: 12-06-2012
Abstract: Microtubule affinity-regulating kinase 4 (MARK4) belongs to a family of kinases that are able to actively phosphorylate the neuronal microtubule-associate proteins (MAPs), such as tau, MAP2 and the ubiquitous MAP4. Abnormal changes in tubulin and the profiles of tau have been previously reported in the human brain and animal transmissible spongiform encephalopathies (TSEs), which may be associated with abnormal alterations of various cellular kinases. To elucidate the possible role of MARK4 in TSE pathogenesis, the MARK4 levels in the brain tissues of scrapie-infected rodents and human prion diseases were evaluated using western blotting and immunohistochemical assays. The results revealed that at terminal stages of the diseases, MARK4 levels in the brain tissues of the scrapie 263K-infected hamsters, 139A-infected mice and a case of Creutzfeldt-Jakob disease (CJD, G114V gCJD) correlated with amounts of PrP(Sc) deposits that were almost undetectable. On the other hand MARK4 signals were noticeable in the brain tissues of a fatal familial insomnia (FFI) patient without PrP(Sc). The reduction of MARK4 was closely related to the prolonged incubation times. These results could be reproduced in SK-N-SH and PC12 cell lines after being exposed to the synthetic peptide PrP106-126. Accordingly, the levels of phosphorylated tau at Ser262 (p-tau262) in cultured cells exposed to PrP106-126, or the ratios of p-tau262/total tau in the brain tissues of 263K-infected hamsters were also significantly decreased. According to our data there is a correlation between a TSE pathological-associated decline of MARK4 in the brain tissues with the deposits of PrP(Sc). Reduction of MARK4 will result in abnormalities of tau phosphorylation, and possibly induce further detachment of microtubules and hinder microtubule transportation.
Publisher: Elsevier BV
Date: 1998
Publisher: American Chemical Society (ACS)
Date: 13-11-2019
Abstract: This study proposed an electrochemical technique for investigating the mechanism of nonradical oxidation of organics with peroxydisulfate (PDS) activated by carbon nanotubes (CNT). The electrochemical property of twelve phenolic compounds (PCs) was evaluated by their half-wave potentials, which were then correlated to their kinetic rate constants in the PDS/CNT system. Integrated with quantitative structure-activity relationships (QSARs), electron paramagnetic resonance (EPR), and radical scavenging tests, the nature of nonradical pathways of phenolic compound oxidation was unveiled to be an electron-transfer regime other than a singlet oxygenation process. The QSARs were established according to their standard electrode potentials, activation energy, and pre-exponential factor. A facile electrochemical analysis method (chronopotentiometry combined with chrono erometry) was also employed to probe the mechanism, suggesting that PDS was catalyzed initially by CNT to form a CNT surface-confined and -activated PDS (CNT-PDS*) complex with a high redox potential. Then, the CNT-PDS* complex selectively abstracted electrons from the co-adsorbed PCs to initiate the oxidation. Finally, a comparison of PDS/CNT and graphite anodic oxidation under constant potentials was comprehensively analyzed to unveil the relative activity of the nonradical CNT-PDS* complex toward the oxidation of different PCs, which was found to be dependent on the oxidative potentials of the CNT-PDS* complex and the adsorbed organics.
Publisher: American Chemical Society (ACS)
Date: 06-04-2016
Abstract: Nanocarbons have been demonstrated as promising environmentally benign catalysts for advanced oxidation processes (AOPs) upgrading metal-based materials. In this study, reduced graphene oxide (rGO) with a low level of structural defects was synthesized via a scalable method for catalytic ozonation of p-hydroxylbenzoic acid (PHBA). Metal-free rGO materials were found to exhibit a superior activity in activating ozone for catalytic oxidation of organic phenolics. The electron-rich carbonyl groups were identified as the active sites for the catalytic reaction. Electron spin resonance (ESR) and radical competition tests revealed that superoxide radical ((•)O2(-)) and singlet oxygen ((1)O2) were the reactive oxygen species (ROS) for PHBA degradation. The intermediates and the degradation pathways were illustrated from mass spectroscopy. It was interesting to observe that addition of NaCl could enhance both ozonation and catalytic ozonation efficiencies and make ·O2(-) as the dominant ROS. Stability of the catalysts was also evaluated by the successive tests. Loss of specific surface area and changes in the surface chemistry were suggested to be responsible for catalyst deactivation.
Publisher: American Chemical Society (ACS)
Date: 09-2017
Abstract: Few-layered tungsten disulfide (WS
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 12-2009
Publisher: Springer Science and Business Media LLC
Date: 14-08-2015
DOI: 10.1038/SREP09548
Publisher: Elsevier BV
Date: 09-2009
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CC05101K
Abstract: Nitrogen-doped SWCNTs with enhanced carbocatalysis were investigated in the activation of superoxides by advanced oxidation and theoretical calculations.
Publisher: Elsevier BV
Date: 09-2015
Publisher: American Chemical Society (ACS)
Date: 19-02-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA13286C
Abstract: Tin sulfide nanoparticles loaded on activated carbon (SnS-AC) were prepared and characterized by FE-SEM, XRD, FT-IR and EDX.
Publisher: Elsevier BV
Date: 08-2017
DOI: 10.1016/J.JCIS.2017.04.001
Abstract: Adsorptive removal of a toxic sulfonamide antibiotic, sulfachloropyradazine (SCP), from aqueous solution was studied on several metal organic frameworks, UiO-66 and ZIF-67, for the first time. UiO-66 exhibited a much higher adsorption capacity than ZIF-67, fast kinetics, and easy regeneration for reuse, demonstrating as a promising adsorbent in wastewater treatment processes. The batch adsorption shows an adsorption capacity of SCP at 417mg/g on UiO-66. The kinetic adsorption of SCP on UiO-66 reached equilibrium just in 10min and the kinetics fits accurately with a pseudo 2nd order model. A plausible mechanism was proposed based on pH effect, pK
Publisher: Elsevier BV
Date: 08-1998
Abstract: Naturally occurring clays and pillared clays are used as supports of nickel catalysts for the methane reforming reaction with carbon dioxide to synthesis gas. The structural and textural characteristics of the supports and catalysts are systematically examined by N2 adsorption/desorption and X-ray diffraction (XRD) techniques. It is found that the pore structures and surface properties of supports greatly affect the catalytic activities of the catalysts prepared. The catalysts supported on the mesoporous clays or pillared clays are obviously superior to those on microporous supports because the mesoporous supports are highly thermal stable compared to the microporous ones. It is found that introducing lanthanum to the supports can improve the catalyst basicity and thus enhance the catalytic activities of these catalysts. Deactivation of catalysts prepared and factors influencing their stability are also discussed. Copyright 1998 Academic Press.
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 10-2011
Publisher: Elsevier BV
Date: 02-2018
Publisher: American Chemical Society (ACS)
Date: 19-10-2017
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.JCIS.2018.11.087
Abstract: Magnetic Fe
Publisher: Elsevier BV
Date: 05-2018
DOI: 10.1016/J.JHAZMAT.2018.01.054
Abstract: The efficient oxidative removal of persistent organic components in wastewater relies on low-cost heterogeneous catalysts that offer high catalytic activity, stability, and recyclability. Here, we designed a series of nanostructured Co-Mn containing perovskite catalysts, LaCo
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 09-2006
DOI: 10.1016/J.CHEMOSPHERE.2006.02.043
Abstract: Natural zeolite and synthetic zeolite, MCM-22, were employed as effective adsorbents for a basic dye, methylene blue, removal from wastewater. Two methods, Fenton oxidation and high temperature combustion, have been used for regeneration of used materials. It is found that MCM-22 exhibits equilibrium adsorption at 1.7 x 10(-4) mol g(-1), much higher than the adsorption of natural zeolite (5 x 10(-5) mol g(-1)) at initial dye concentration of 2.7 x 10(-5)M and 30 degrees C. Solution pH will affect the adsorption behaviour of MCM-22. Higher solution pH results in higher adsorption capacity. The regenerated adsorbents show different capacity depending on regeneration technique. Physical regeneration by high temperature combustion will be better than chemical regeneration using Fenton oxidation in producing effective adsorbents. Regeneration of MCM-22 by high temperature treatment can make the adsorbent exhibit comparable or superior adsorption capacity as compared to the fresh s le depending on the temperature and time. The optimal temperature and time will be 540 degrees C and 1h. The Fenton oxidation will recover 60% adsorption capacity. For natural zeolite, regeneration can not fully recover the adsorption capacity with the two techniques and the regenerated natural zeolites by the two techniques are similar, showing 60% adsorption capacity of fresh s le. Kinetic studies indicate that the adsorption follows pseudo-second-order kinetics.
Publisher: Elsevier BV
Date: 20-05-2006
DOI: 10.1016/J.JHAZMAT.2005.10.034
Abstract: Fly ash was modified by hydrothermal treatment using NaOH solutions under various conditions for zeolite synthesis. The XRD patterns are presented. The results indicated that the s les obtained after treatment are much different. The XRD profiles revealed a number of new reflexes, suggesting a phase transformation probably occurred. Both heat treatment and chemical treatment increased the surface area and pore volume. It was found that zeolite P would be formed at the conditions of higher NaOH concentration and temperature. The treated fly ash was tested for adsorption of heavy metal ions and dyes in aqueous solution. It was shown that fly ash and the modified forms could effectively absorb heavy metals and methylene blue but not effectively adsorb rhodamine B. Modifying fly ash with NaOH solution would significantly enhance the adsorption capacity depending on the treatment temperature, time, and base concentration. The adsorption capacity of methylene blue would increases with pH of the dye solution and the sorption capacity of FA-NaOH could reach 5 x 10(-5) mol/g. The adsorption isotherm could be described by the Langmuir and Freundlich isotherm equations. Removal of copper and nickel ions could also be achieved on those treated fly ash. The removal efficiency for copper and nickel ions could be from 30% to 90% depending on the initial concentrations. The increase in adsorption temperature will enhance the adsorption efficiency for both heavy metals. The pseudo second-order kinetics would be better for fitting the dynamic adsorption of Cu and Ni ions.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3RA42455C
Publisher: Elsevier BV
Date: 2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA02295A
Abstract: The flower-type V 2 O 5 hollow microspheres with assistance of carbon-sphere templates were fabricated and applied to photocatalytic degradation of gaseous o -DCB.
Publisher: Elsevier BV
Date: 02-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9EN00567F
Abstract: Z-Scheme CdS@Ti 3 C 2 @TiO 2 nanohybrids using MXene Ti 3 C 2 as a non-metal charge carrier mediator exhibited superior performance in sulfachloropyridazine degradation.
Publisher: Elsevier BV
Date: 12-2010
Publisher: Elsevier BV
Date: 12-2019
Publisher: American Chemical Society (ACS)
Date: 17-12-2018
Publisher: Elsevier BV
Date: 08-2010
Publisher: Elsevier BV
Date: 2018
Publisher: American Chemical Society (ACS)
Date: 24-06-2022
Publisher: Elsevier BV
Date: 12-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4DT03927K
Abstract: Three new amino-functionalized MOFs based on 2-aminoterephthalic acid with Mg( ii ), Co( ii ) and Sr( ii ) ions.
Publisher: American Chemical Society (ACS)
Date: 22-10-2014
DOI: 10.1021/IE503437Z
Publisher: Elsevier BV
Date: 11-2008
Publisher: The Chemical Society of Japan
Date: 1999
DOI: 10.1246/CL.1999.25
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC03538A
Abstract: In a straightforward two-step synthesis process, Au–Fe 3 O 4 dimer was injected as a seed into the Cd precursor solution yielding a hybrid heterotrimer of Fe 3 O 4 –Au–CdS, integrating magnetic, plasmonic and semiconducting functionalities in one-particle.
Publisher: American Chemical Society (ACS)
Date: 25-06-2014
DOI: 10.1021/CS5005739
Publisher: Elsevier BV
Date: 08-2008
DOI: 10.1016/J.CHEMOSPHERE.2008.05.013
Abstract: Red mud (RM) is a by-product of bauxite processing via the Bayer process. Its disposal remains an issue of great importance with significant environmental concerns. In the past decades, a lot of research has been done to utilize red mud for environmental-benign applications such as a building material additive and for metal recovery. In recent years, red mud has also been explored for gas cleaning and wastewater treatment. In this paper, we review varying novel applications of red mud as a coagulant and adsorbent for water and gas treatment as well as catalyst for some industrial processes. The environmental compatibility of red mud is discussed. Some directions of future research are also proposed. Red mud presents a promising application in water treatment for removal of toxic heavy metal and metalloid ions, inorganic anions such as nitrate, fluoride, and phosphate, as well as organics including dyes, phenolic compounds and bacteria. In addition, red mud can also be employed as catalysts for hydrogenation, hydrodechlorination and hydrocarbon oxidation. Moreover, leaching and eco-toxicological tests indicate that red mud does not present high toxicity to the environment before or after reuse.
Publisher: Wiley
Date: 12-12-2014
DOI: 10.1111/JACE.12690
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CC06589A
Abstract: Herein, we report the in situ synthesis of ZIF-8 membranes on the external surface of asymmetric ZnO–Al 2 O 3 composite hollow fibers.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA06921B
Abstract: The activity of Ni, Co, or Mn-based oxygen-evolving catalysts is screened and M-Bi/rGO/ZnO photoanodes are demonstrated for photoelectrochemical water splitting.
Publisher: Elsevier BV
Date: 10-2019
DOI: 10.1016/J.JCIS.2019.07.002
Abstract: Novel metal-free catalysts via integration of covalent organic framework (COF) and graphitic carbon nitride (g-C
Publisher: Elsevier BV
Date: 05-2011
Publisher: Elsevier BV
Date: 03-2019
Publisher: Springer Science and Business Media LLC
Date: 20-12-2011
Publisher: American Chemical Society (ACS)
Date: 08-01-2021
Publisher: Elsevier BV
Date: 11-2007
DOI: 10.1016/J.JCIS.2007.06.034
Abstract: Fly ash is solid waste from combustion process, containing oxide minerals and unburned carbon. In this investigation, fly ash has been separated into metal oxide mineral section and unburned carbon. The fly ash with different contents of unburned carbon was employed for humic acid adsorption to investigate the influence of unburned carbon on adsorption. It is found that metal oxides and unburned carbon in fly ash exhibit significant difference in humic acid adsorption. The unburned carbon plays the major role in adsorption. Higher content of unburned carbon in fly ash results in higher surface area and thus higher humic acid adsorption. Fly ash and unburned carbon exhibit adsorption capacity of humic acid of 11 and 72 mg/g, respectively, at 30 degrees C, pH 7. Humic acid adsorption is also affected by ion strength, pH, and temperature. The thermodynamic calculations indicate that the adsorption is endothermic nature with DeltaH(0) and DeltaS(0) as 5.79 kJ/mol and 16.0 J/K mol, respectively.
Publisher: Informa UK Limited
Date: 09-11-2012
DOI: 10.4161/AUTO.21482
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0CS01032D
Abstract: This review presents the recent advances in synthetic strategies, characterisation, and computations of carbon-based single-atom catalysts, as well as their innovative applications and mechanisms in advanced oxidation technologies.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 05-2017
DOI: 10.1016/J.BIOS.2016.12.021
Abstract: A bio-electrochemical strategy was developed for constructing a simple and sensitive levofloxacin (LEV) sensor based on a single chamber microbial fuel cell (SC-MFC) using FePO
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 02-2018
Publisher: American Chemical Society (ACS)
Date: 11-11-2021
Publisher: Elsevier BV
Date: 06-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA02953C
Abstract: This review summarizes the recent advances in carbocatalyzed ozonation and the corresponding surface engineering protocols and mechanistic insights.
Publisher: Elsevier BV
Date: 07-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6EN00397D
Abstract: Iron carbide nanocrystals encapsulated by nitrogen-doped carbon nanotubes demonstrated efficient and robust environmental catalysis for green remediation processes.
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 10-2015
DOI: 10.1016/J.JHAZMAT.2015.04.046
Abstract: Novel CuFe2O4@C3N4 core-shell photocatalysts were fabricated through a self-assembly method and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, transmission electron microscopy and Uv-vis diffuse reflection spectroscopy. The photocatalytic performances of the CuFe2O4@C3N4 catalysts were evaluated in photo Fenton-like discoloration of Orange II dye using H2O2 as an oxidant under visible-light irradiation (λ>420 nm). It was found the CuFe2O4@C3N4 hybrid (mass ratio of CuFe2O4/g-C3N4 at 2:1) exhibits a superior activity as compared with single component of CuFe2O4 or g-C3N4 and the mixture of g-C3N4 and CuFe2O4, due to the elevation of the separation efficiency of photoinduced electron-hole pairs, resulted from the heterojunction between the interfaces of g-C3N4 and CuFe2O4. The quenching tests of different scavengers displayed that O2(•-), OH and h(+) are responsible for the Orange II decolorization. In addition, the effects of initial concentration of the dye contaminant (0.014-0.140 mM), different anions (Cl(-), SO4(2-), NO3(-), CH3COO(-) and HCO3(-)) and temperature (15-65 °C) in photoreaction were also investigated. The CuFe2O4@C3N4 s le exhibited stable performance without obvious loss of catalytic activity after five successive runs, showing a promising application for the photo-oxidative degradation of environmental contaminants.
Publisher: American Chemical Society (ACS)
Date: 12-01-2001
DOI: 10.1021/EF000149W
Publisher: Wiley
Date: 07-2010
DOI: 10.1002/APJ.446
Publisher: American Chemical Society (ACS)
Date: 10-03-2011
DOI: 10.1021/JE100993M
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA90080H
Abstract: Correction for ‘Sensitive and selective determination of aqueous triclosan based on gold nanoparticles on polyoxometalate/reduced graphene oxide nanohybrid’ by Mehmet Lütfi Yola et al. , RSC Adv. , 2015, 5 , 65953–65962.
Publisher: Elsevier BV
Date: 09-0010
DOI: 10.1016/J.JCIS.2013.06.061
Abstract: Spinel structured Mn3O4, Co3O4 and Fe3O4 nanoparticles were prepared, characterized, and tested in degradation of aqueous phenol in the presence of peroxymonosulfate. It was found that Mn3O4 and Co3O4 nanoparticles are highly effective in heterogeneous activation of peroxymonosulfate to produce sulfate radicals for phenol degradation. The activity shows an order of Mn3O4>Co3O4>Fe3O4. Mn3O4 could fast and completely remove phenol in about 20 min, at the conditions of 25 ppm phenol, 0.4 g/L catalyst, 2 g/L oxone®, and 25 °C. A pseudo first order model would fit to phenol degradation kinetics and activation energies on Mn3O4 and Co3O4 were obtained as 38.5 and 66.2 kJ/mol, respectively. In addition, Mn3O4 exhibited excellent catalytic stability in several runs, demonstrating that Mn3O4 is a promising catalyst alternative to toxic Co3O4 for water treatment.
Publisher: Elsevier BV
Date: 12-2019
Publisher: American Chemical Society (ACS)
Date: 27-11-2019
Abstract: Minerals and transitional metal oxides of earth-abundant elements are desirable catalysts for in situ chemical oxidation in environmental remediation. However, catalytic activation of peroxydisulfate (PDS) by manganese oxides was barely investigated. In this study, one-dimension manganese dioxides (α- and β-MnO
Publisher: Wiley
Date: 13-08-2020
Publisher: American Chemical Society (ACS)
Date: 22-05-2013
DOI: 10.1021/ES400878C
Abstract: Three one-dimensional MnO2 nanoparticles with different crystallographic phases, α-, β-, and γ-MnO2, were synthesized, characterized, and tested in heterogeneous activation of Oxone for phenol degradation in aqueous solution. The α-, β-, and γ-MnO2 nanostructured materials presented in morphologies of nanowires, nanorods, and nanofibers, respectively. They showed varying activities in activation of Oxone to generate sulfate radicals for phenol degradation depending on surface area and crystalline structure. α-MnO2 nanowires exhibited the highest activity and could degrade phenol in 60 min at phenol concentrations ranging in 25-100 mg/L. It was found that phenol degradation on α-MnO2 followed first order kinetics with an activation energy of 21.9 kJ/mol. The operational parameters, such as MnO2 and Oxone loading, phenol concentration and temperature, were found to influence phenol degradation efficiency. It was also found that α-MnO2 exhibited high stability in recycled tests without losing activity, demonstrating itself to be a superior heterogeneous catalyst to the toxic Co3O4 and Co(2+).
Publisher: Elsevier BV
Date: 08-2011
Publisher: Elsevier BV
Date: 2016
DOI: 10.1016/J.JCIS.2015.09.051
Abstract: Changing oil-wet surfaces toward higher water wettability is of key importance in subsurface engineering applications. This includes petroleum recovery from fractured limestone reservoirs, which are typically mixed or oil-wet, resulting in poor productivity as conventional waterflooding techniques are inefficient. A wettability change toward more water-wet would significantly improve oil displacement efficiency, and thus productivity. Another area where such a wettability shift would be highly beneficial is carbon geo-sequestration, where compressed CO2 is pumped underground for storage. It has recently been identified that more water-wet formations can store more CO2. We thus examined how silica based nanofluids can induce such a wettability shift on oil-wet and mixed-wet calcite substrates. We found that silica nanoparticles have an ability to alter the wettability of such calcite surfaces. Nanoparticle concentration and brine salinity had a significant effect on the wettability alteration efficiency, and an optimum salinity was identified, analogous to that one found for surfactant formulations. Mechanistically, most nanoparticles irreversibly adhered to the oil-wet calcite surface (as substantiated by SEM-EDS and AFM measurements). We conclude that such nanofluid formulations can be very effective as enhanced hydrocarbon recovery agents and can potentially be used for improving the efficiency of CO2 geo-storage.
Publisher: Elsevier BV
Date: 07-2012
Publisher: Elsevier BV
Date: 20-05-1998
Publisher: Elsevier BV
Date: 10-2008
DOI: 10.1016/J.JHAZMAT.2008.01.061
Abstract: Red mud, a waste residue of alumina refinery, has been used to develop effective adsorbents to remove phosphate from aqueous solution. Acid and acid-thermal treatments were employed to treat the raw red mud. The effects of different treatment methods, pH of solution and operating temperature on adsorption have been examined in batch experiments. It was found that all activated red mud s les show higher surface area and total pore volume as well as higher adsorption capacity for phosphate removal. The red mud with HCl treatment shows the highest adsorption capacity among all the red mud s les, giving adsorption capacity of 0.58 mg P/g at pH 5.5 and 40 degrees C. The adsorption capacity of the red mud adsorbents decreases with increase of pH. At pH 2, the red mud with HCl treatment exhibits adsorption of 0.8 mg P/g while the adsorption can be lowered to 0.05 mg P/g at pH 10. However, the adsorption is improved at higher temperature by increasing 25% from 30 to 40 degrees C. The kinetic studies of phosphate adsorption onto red mud indicate that the adsorption mainly follows the parallel first-order kinetics due to the presence of two acidic phosphorus species, H(2)PO(4)(-) and HPO(4)(2-). An analysis of the adsorption data indicates that the Freundlich isotherm provides a better fitting than the Langmuir model.
Publisher: Elsevier BV
Date: 02-2021
Publisher: American Chemical Society (ACS)
Date: 26-07-2021
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 2017
DOI: 10.1016/J.JHAZMAT.2016.10.020
Abstract: Recently, tremendous efforts have been devoted to developing carbon-based metal-free catalysts as an alternative to metal-based catalysts for remediation of emerging contaminants. However, further investigations have demonstrated that the durability of carbocatalysts is poor. Therefore, it is extremely desirable to seek a novel metal-free catalyst with high efficiency and superb stability. Herein, we first discovered that amorphous boron (A-boron) can be used as a metal-free catalyst for peroxymonosulfate (PMS) activation to produce free radicals for effective degradation of bisphenol S (BPS), which is a newly-occurring estrogenic endocrine-disrupting chemical. It exhibited outstanding catalytic activity and superior stability as comparing to metal-based and metal-free carbon-based catalysts. Moreover, many other typical organic pollutants in water such as bisphenol F, sulfamethoxazole, rhodamine B and methyl orange can also be effectively decomposed in A-boron/PMS oxidative system. The effects of reaction parameters on BPS degradation were systematically investigated. The catalytic oxidation mechanism was proposed. The intriguing catalytic feature of A-boron discovered in this study will provide new opportunities for the future development of A-boron based materials with promising applications in water remediation.
Publisher: Elsevier BV
Date: 07-2014
Publisher: American Chemical Society (ACS)
Date: 10-06-2020
Publisher: Springer Science and Business Media LLC
Date: 11-2003
Publisher: Elsevier BV
Date: 11-2008
Publisher: Elsevier BV
Date: 09-2013
Publisher: Elsevier BV
Date: 2007
DOI: 10.1016/J.JHAZMAT.2006.06.018
Abstract: Solid-state conversion of fly ash to an amorphous aluminosilicate adsorbent (geopolymer) has been investigated under different conditions and the synthesised material has been tested for Cu2+ removal from aqueous solution. It has been found that higher reaction temperature and Na:FA ratio will make the adsorbents achieving higher removal efficiency. The adsorbent loading and Cu2+ initial concentration will also affect the removal efficiency while the adsorption capacity exhibits similarly at 30-40 degrees C. The adsorption capacity of the synthesised adsorbent shows much higher value than fly ash and natural zeolite. The capacity is 0.1, 3.5 and 92 mg/g, for fly ash, natural zeolite, and FA derived adsorbent, respectively. The kinetic studies indicate that the adsorption can be fitted by the second-order kinetic model. Langmuir and Freundlich isotherms also can fit to the adsorption isotherm.
Publisher: American Chemical Society (ACS)
Date: 22-12-2015
DOI: 10.1021/CS5017613
Publisher: Elsevier BV
Date: 10-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA02558K
Abstract: We present a variety of amorphous transition-metal borides prepared at room temperature by a chemical reduction method as highly active catalysts for the oxygen evolution reaction (OER).
Publisher: Elsevier BV
Date: 12-2018
Publisher: American Chemical Society (ACS)
Date: 20-02-2017
Publisher: Elsevier BV
Date: 05-2020
Publisher: Wiley
Date: 27-09-2022
DOI: 10.1002/CEY2.255
Abstract: Sophisticated efficient electrocatalysts are essential to rectifying the shuttle effect and realizing the high performance of flexible lithium‐sulfur batteries (LSBs). Phase transformation of MoSe 2 from the 2H phase to the 1T phase has been proven to be a significant method to improve the catalytic activity. However, precisely controllable phase engineering of MoSe 2 has rarely been reported. Herein, by in situ Li ions intercalation in MoSe 2 , a precisely controllable phase evolution from 2H‐MoSe 2 to 1T‐MoSe 2 was realized. More importantly, the definite functional relationship between cut‐off voltage and phase structure was first identified for phase engineering through in situ observation and modulation methods. The sulfur host (CNFs/1T‐MoSe 2 ) presents high charge density, strong polysulfides adsorption, and catalytic kinetics. Moreover, Li‐S cells based on it display capacity retention of 875.3 mAh g −1 after 500 cycles at 1 C and an areal capacity of 8.71 mAh cm −2 even at a high sulfur loading of 8.47 mg cm −2 . Furthermore, the flexible pouch cell exhibiting decent performance will endow a promising potential in the wearable energy storage field. This study proposes an effective strategy to precisely control the phase structure of MoSe 2 , which may provide the reference to fabricate the highly efficient electrocatalysts for LSBs and other energy systems.
Publisher: Elsevier BV
Date: 11-2014
DOI: 10.1016/J.JCIS.2014.07.018
Abstract: Magnetic separation is more cost-effective than conventional separation processes in heterogeneous catalysis, especially for ultrafine nanoparticles. Magnetic core/shell nanospheres (MCS, Fe3O4/carbon) were synthesized by a hydrothermal method and their supported manganese oxide nanoparticles (Mn/MCS) were obtained by redox reactions between MCS and potassium permanganate at a low temperature. The materials were analyzed by a variety of characterization techniques such as powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectrometer (EDS), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and N2 adsorption/desorption. The Mn/MCS catalysts were able to effectively activate Oxone® for phenol degradation in aqueous solutions. Nitrogen treated MCS supported Mn achieved 100% conversion within 120min. Kinetic studies showed that phenol degradation over supported Mn catalysts follows the first order kinetics. It was also found that the catalysts can be easily separated from the aqueous solutions by an external magnetic field. The Oxone® activation mechanism by Mn/MCS catalysts was discussed and sulfate radicals were suggested to be the primary reactive species generated from peroxymonosulfate (PMS) for phenol catalytic oxidation.
Publisher: Elsevier BV
Date: 2024
Publisher: Elsevier BV
Date: 08-2012
DOI: 10.1016/J.JCIS.2012.04.030
Abstract: Amino-functionalized Fe(3)O(4)/SiO(2) core/shell nanoparticles were synthesized by reacting Fe(3)O(4) nanoparticles with tetraethyl orthosilicate and (3-aminopropyl) triethoxysilane to introduce amino groups on the surface. The amino groups on the Fe(3)O(4)/SiO(2) were reacted with the carboxylic groups of graphene oxide (GO) with the aid of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinnimide to form Fe(3)O(4)/SiO(2)GO nanoparticles. The structural, surface, and magnetic characteristics of the material were investigated by scanning and transmission electron microscopy, energy-dispersive X-ray spectrometry, powder X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Adsorption equilibrium and kinetics of methylene blue on the Fe(3)O(4)/SiO(2)GO were studied in a batch system. The maximum adsorption capacities were found to be 97.0, 102.6, and 111.1 mg g(-1) at 25, 45, and 60°C, respectively. A second-order kinetic equation could best describe the sorption kinetics. Thermodynamic parameters indicated that the adsorption of methylene blue onto the material was thermodynamically feasible and could occur spontaneously.
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 04-2014
DOI: 10.1016/J.JHAZMAT.2014.01.027
Abstract: Magnetic iron based materials are generally effective for many catalytic reactions and can be magnetically recovered after application, showing advantages than other metal oxides. In the present work, magnetic MnFe2O4 nanoparticle and MnFe2O4-reduced graphene oxide (rGO) hybrid were prepared and used as catalysts to activate peroxymonosulfate (PMS) to oxidatively degrade various organic pollutants in water. From a process of chemical deposition and reduction, MnFe2O4-rGO hybrids were produced with nanosized MnFe2O4 particles (ca. 13.2 nm). It was found that MnFe2O4 or MnFe2O4-rGO presented high activity in activating PMS to produce sulfate radicals for degradation of organic dyes (Methyl violet, Methyl orange, Methylene blue, Orange II and Rhodamine B) and could be separated with a magnet without any loss. The reaction kinetics, effect of different ion species CL(-),HCO3(-),CH3COO(-)and NO3(-) and Cl(-) strength, reaction temperature (25-65°C), catalytic stability, as well as degradation mechanism were comprehensively studied. The lower activation energy on MnFe2O4-rGO (25.7 kJ/mol) justify the higher chemical performance than that of MnFe2O4 (31.7 kJ/mol), suggesting that graphene plays a significant role in the enhanced degradation of dyes. More importantly, the as-prepared MnFe2O4 and MnFe2O4-rGO hybrid exhibited stable performance to remove the organic pollutants in wastewater with easy recycling and good stability by successive degradation experiments.
Publisher: American Chemical Society (ACS)
Date: 07-11-2014
DOI: 10.1021/AM505309B
Abstract: In heterogeneous catalysis for water treatment, feasible recovery of nanocatalysts is crucial to make the process cost-effective and environmentally benign. In this study, we applied two strategies, for ex le, magnetic separation and hierarchical structure of solid catalysts, to ensure manganese catalysts are readily separable, meanwhile their catalytic performance was retained by the nanosized structure of MnO2 nanosheets or nanorods. ZnFe2O4 was used as the magnetic core and MnO2 corolla-like sphere consisting of nanosheets, and sea-urchin shaped structure made of nanorods, were fabricated by a hydrothermal method at 100 and 140 °C, respectively. Crystalline structure, morphology and textural property of the materials were investigated. The prepared catalysts were able to effectively activate peroxymonosulfate (PMS) to generate sulfate radicals for catalytic oxidation of a typical organic pollutant of phenol. After the heterogeneous catalysis, the catalysts were easily recovered by applying an external magnetic field. The effects of temperature and repeated use on the degradation efficiencies were evaluated. The generation and evolution of sulfate radicals and phenol oxidation were studied using both competitive radical tests and electron paramagnetic resonance (EPR).
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 08-2019
DOI: 10.1016/J.WATRES.2019.05.008
Abstract: Biochars are low-cost and environmental-friendly materials, which are promising in wastewater treatment. In this study, biochars were manufactured from C-phycocyanin extracted (C-CP) Spirulina residue (SDBC) via thermal pyrolysis. Simultaneously, N-doping was also achieved from the protein in the algae for obtaining a high-performance carbocatalyst for peroxydisulfate (PDS) activation. The SDBC yielded large specific surface areas, nitrogen loading, and good conductivity, which demonstrated excellent oxidation efficiencies toward a wide array of aqueous microcontaminants. An in-depth mechanistic study was performed by integrating selective radical scavenging, solvent exchange (H
Publisher: Elsevier BV
Date: 10-2007
DOI: 10.1016/J.JCIS.2007.05.032
Abstract: A natural zeolite was employed as adsorbent for removal of malachite green and Pb(2+) ions from aqueous solution. A batch system was applied to study the adsorption behaviour of the dye and heavy metal in single and binary systems on the natural zeolite. Kinetic studies indicate that malachite green and Pb(2+) adsorption on the natural zeolite in a single component system follows the first-order kinetics and the adsorption is diffusion process with single-stage for Pb(2+) and two-stage for malachite green. For the single system, malachite green adsorption isotherm follows the Langmuir model while Pb adsorption follows the Freundlich isotherm. The adsorption capacities of malachite green and Pb at 30 degrees C, pH 6 are 5x10(-5) and 10x10(-5)mol/g, respectively. In the binary system, malachite green and Pb(2+) exhibit competitive adsorption on the natural zeolite. The adsorption is reduced to 90 and 80% of single component of Pb(2+) and malachite green, respectively. However, the total adsorption is higher. In the binary system, Pb(2+) exhibits relative higher affinity and selectivity to be adsorbed on zeolite. The dynamic adsorption of malachite green and Pb(2+) still follows the first-order kinetics.
Publisher: Springer Science and Business Media LLC
Date: 14-08-2015
DOI: 10.1038/NCOMMS9005
Publisher: Elsevier BV
Date: 09-2005
DOI: 10.1016/J.CHEMOSPHERE.2005.01.091
Abstract: The effect of different methods for fly ash treatment using conventional chemical, sonochemical and microwave method on dye adsorption in aqueous solution was investigated. Three basic dyes, methylene blue, crystal violet and rhodamine B, are employed for adsorption testing. It is found that fly ash shows different adsorption capacity depending on type of dyes. Chemical treatment using HCl will increase the adsorption capacity. The adsorption capacity of HCl treated fly ash varies with the preparation conditions. Microwave treatment is a fast and efficient method while producing the s le with the highest adsorption capacity. Solution pH and inorganic salts in dye solution can significantly influence the adsorption. The adsorption data have been analysed using Langmuir, Freundlich and Redlich-Peterson isotherms. The results indicate that the Freundlich and Redlich-Peterson models provide the better correlations with the experimental data.
Publisher: Wiley
Date: 04-05-2005
DOI: 10.1002/JCTB.1299
Publisher: Elsevier BV
Date: 2008
Publisher: Elsevier BV
Date: 03-2000
Publisher: Informa UK Limited
Date: 16-04-2020
Publisher: Springer Science and Business Media LLC
Date: 18-10-2013
DOI: 10.1007/S12035-013-8560-1
Abstract: The 14-3-3 proteins are a family of highly homologous and ubiquitously expressed isoforms that are involved in a wide variety of physiological processes. 14-3-3 have showed actively molecular interaction with PrP and positive 14-3-3 is frequently observed in the cerebrospinal fluid (CSF) s les of the patients with sporadic Creutzfeldt-Jakob disease (CJD). However, the alterations of 14-3-3 in the brain tissues of patients with prion diseases remain little addressed. To address the possible change of brain 14-3-3 during prion infection, we firstly tested the levels of 14-3-3 in the brain tissues of scrapie agent 263 K infected hamsters. Obviously decreased 14-3-3 were observed in the s les of the infected animals, showing time-dependent reduction in the incubation period, while the amounts of S-nitrosylated 14-3-3 were increased in the brains collected at the late stage. A low level of 14-3-3 was also observed in the scrapie infectious cell line SMB-S15, accompanied with up-regulated Bax and down-regulated Bcl-2. Moreover, we found that treatment of PrP106-126 on the cultured cells decreased the cellular 14-3-3 and caused translocations of cellular Bax to the membrane fractions. Knockdown of cellular 14-3-3 sensitized the cultured cells to the challenge of PrP106-126. These data illustrate that significant down-regulation of brain 14-3-3 levels during prion infection may not only be a scenario of the terminal consequence of interacting with abnormal PrP(Sc) but may also participate in the pathogenesis of neuronal damage.
Publisher: Wiley
Date: 21-09-2018
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 11-2005
DOI: 10.1016/J.JHAZMAT.2005.05.049
Abstract: Unburned carbon in fly ash is an important by-product from coal combustion. In this investigation, unburned carbon has been separated from fly ash and been employed as a low cost adsorbent for a basic dye adsorption (Rhodamine B) in aqueous solution. Adsorption isotherm and kinetics of adsorption have been investigated using batch experiments. It is found that dye adsorption capacity depends on initial concentration, pH of solution, and temperature. The adsorption isotherm can be described by Langmuir model and the adsorption capacity of Rhodamine B at 30, 40, and 50 degrees C can reach 9.7 x 10(-5), 1.14 x 10(-4), and 1.5 x 10(-4)mol g(-1), respectively. The pseudo first- and second-order kinetic models have been employed to fit the dynamic adsorption. It is found that the dynamic adsorption follows the pseudo second-order model. Thermodynamic calculations indicate that the adsorption is endothermic reaction with DeltaH degrees at 25 kJ mol(-1).
Publisher: Elsevier BV
Date: 09-2020
Publisher: American Chemical Society (ACS)
Date: 04-10-2023
Publisher: Informa UK Limited
Date: 03-2013
Publisher: Elsevier BV
Date: 07-2018
Publisher: Wiley
Date: 30-07-2018
Abstract: Quasi-1D cadmium chalcogenide quantum rods (QRs) are benchmark semiconductor materials that are combined with noble metals to constitute QR heterostructures for efficient photocatalysis. However, the high toxicity of cadmium and cost of noble metals are the main obstacles to their widespread use. Herein, a facile colloidal synthetic approach is reported that leads to the spontaneous formation of cadmium-free alloyed ZnS
Publisher: Elsevier BV
Date: 11-2015
Publisher: Elsevier BV
Date: 12-1998
Publisher: Elsevier BV
Date: 2008
Publisher: Elsevier BV
Date: 12-2020
No related grants have been discovered for Shaobin Wang.