ORCID Profile
0000-0002-2135-1913
Current Organisations
University of Luxembourg
,
Imperial College London
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Functional Materials | Materials Engineering | Chemical Engineering | Wastewater Treatment Processes | Organic Green Chemistry | Carbon Capture Engineering (excl. Sequestration) | Metals and Alloy Materials | Membrane and Separation Technologies | Non-automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels) | Electrochemistry | Timber, Pulp and Paper | Biocatalysis and Enzyme Technology | Materials Engineering not elsewhere classified |
Biofuel (Biomass) Energy | Management of Greenhouse Gas Emissions from Electricity Generation | Transformation of Coal into Gaseous Fuels | Energy Storage (excl. Hydrogen) | Paper Products (incl. Coated Paper) | Organic Industrial Chemicals (excl. Resins, Rubber and Plastics) | Environmentally Sustainable Manufacturing not elsewhere classified | Health not elsewhere classified | Transformation of Coal into Liquid Fuels | Expanding Knowledge in Technology
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 02-2011
Publisher: Elsevier BV
Date: 11-2011
DOI: 10.1016/J.JCIS.2011.07.071
Abstract: A new type of nanocomposite ion-exchange membranes containing sulfonated polyethersulfone (sPES) polymer matrix and sulfonated surface-functionalized mesoporous silica (SS) inorganic fillers was prepared. Various characterizations revealed that the addition of inorganic fillers with different shapes had a significant influence on the membrane structure. The mesoporous inorganic fillers not only created extra pore and water channels, assisting the ionic migration and improving conductivity of the composites, but also provided additional fixed charge groups upon surface modification. This allows the Donnan exclusion to work effectively and thus improve the selectivity of membranes. It was proved that the incorporation of appropriate amount of SS additive could significantly improve the conductivity (up to 20 folds) and permselectivity (about 14%) of the sPES membranes. The performance of these newly developed membranes in desalination by electrodialysis was comparable with that of a commercial membrane (FKE).
Publisher: American Chemical Society (ACS)
Date: 11-09-2018
Abstract: A new generation-2 light-responsive metal-organic framework (MOF) has been successfully synthesized using Zn as the metal source and both 2-phenyldiazenyl terephthalic acid and 1,4-diazabicyclo[2.2.2]octane (DABCO) as the ligands. It was found that Zn-azo-dabco MOF (Azo-DMOF-1) exhibited a photoresponsive CO
Publisher: American Chemical Society (ACS)
Date: 16-04-2010
DOI: 10.1021/JP102368S
Publisher: American Chemical Society (ACS)
Date: 07-02-2019
DOI: 10.26434/CHEMRXIV.7593902
Abstract: b Abstract /b As a nanoporous polymer, Azo-COP-2 has been reported for having exceptional CO sub /sub /N sub /sub separation performance. In this study, we further investigate the application of Azo-COP-2 as a potential for low-energy CO sub /sub adsorbent and porous filler in mixed matrix membranes for CO sub /sub /N sub /sub separation. As an adsorbent, thanks to the presence of azobenzene in its framework, Azo-COP-2 showed lower CO sub /sub uptake when irradiated with UV light than its normal condition. Azo-COP-2 also exhibited a highly efficient CO sub /sub photoswitching between its irradiated and non-irradiated state that has not been observed previously in any nanoporous polymer. Combined with high CO sub /sub /N sub /sub selectivity, this property renders Azo-COP-2 to be an excellent candidate for low-energy CO sub /sub capture. A beneficial property was also exhibited by Azo-COP-2 once they were used as porous filler in mixed-matrix membranes (MMMs) using three different polymer matrices: Matrimid, polysulfone and PIM-1. Both permeability and selectivity of the MMMs could be simultaneously improved once ideal interaction between Azo-COP-2 and the polymer could be established. It was found that Azo-COP-2 – polysulfone composites had the best performance. In this case, it was observed that the CO sub /sub permeability and CO2/N2 selectivity could be increased up to 160% and 66.7%, respectively. The strategy then shows the great potential of Azo-COP-2 not only for an advanced low-energy CO sub /sub adsorbent but also to improve the performance of conventional polymeric membrane for CO sub /sub post-combustion capture. br /
Publisher: American Chemical Society (ACS)
Date: 21-12-2020
DOI: 10.26434/CHEMRXIV.13399367
Abstract: In this study, novel a mixed matrix polyethersulfone (PES) membranes /a were synthesized by using two different kinds of metal organic frameworks (MOFs), namely UiO-66 and UiO-66-NH sub /sub . The composite membranes were characterised by SEM, EDX, FTIR, PXRD, water contact angle, porosity, pore size, etc. Membrane performance was investigated by water permeation flux, flux recovery ratio, fouling resistance and anti-fouling performance. The stability test was also conducted for the prepared mixed matrix membranes. A higher reduction in the water contact angle was observed after adding both MOFs to the PES and sulfonated PES membranes compared to pristine PES membranes. An enhancement in membrane performance was observed by embedding the MOF into PES membrane matrix, which may be attributed to the super-hydrophilic porous structure of UiO-66-NH sub /sub nanoparticles and hydrophilic structure of UiO-66 nanoparticles that could accelerate the exchange rate between solvent and non-solvent during the phase inversion process. By adding the MOFs into PES matrix, the flux recovery ratio was increased greatly (more than 99% for most mixed matrix membranes). The mixed matrix membranes showed higher resistance to protein adsorption compared to pristine PES membranes. After immersing the membranes in water for 3 months, 6 months and 12 months, both MOFs were stable and retained their structure. This study indicates that UiO-66 and UiO-66-NH sub /sub are great candidates for designing long-term stable mixed matrix membranes with higher anti-fouling performance.
Publisher: American Chemical Society (ACS)
Date: 27-10-2020
DOI: 10.26434/CHEMRXIV.13138997
Abstract: Solvent induced enantioselectivity reversal is a rarely reported phenomenon in porous homochiral materials. Similar behaviour has been studied in chiral HPLC, where minor mobile phase modifications can induce elution order reversal. We report the first instance of solvent-induced enantioselectivity reversal for homochiral MOF ZnBLD, highlighting the complex enantioselectivity behaviour
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA02096A
Abstract: Tailoring the content of the light-responsive ligand in UiO-66 topology through a mixed-linker approach for CO 2 adsorbent and mixed matrix membrane application.
Publisher: Elsevier BV
Date: 08-2012
Publisher: American Chemical Society (ACS)
Date: 26-03-2021
DOI: 10.26434/CHEMRXIV.14292293.V1
Abstract: ABSTRACT Competition between atmospheric moisture and volatile organic compounds (VOCs) for an adsorbent’s sites can significantly impact its VOC removal efficiency. The development of moisture-tolerant adsorbents is essential to address this issue. A vapor phase deposition process using polydimethylsiloxane (PDMS) has created a hydrophobic form of the highly porous, normally hydrophilic, MOF MIL-101. After optimizing the PDMS vapor deposition time and molecular weights, hydrophobicity index calculations verified the improved hydrophobicity of the coated MOF (MIL-PDMS-Sigma-0.25) over its pristine form. The surface area, pore volume as well as single component vapor adsorption of water and toluene capacities were also preserved, resulting to similar performance to MIL-101. Toluene-water vapor co-adsorption experiments were conducted at 40% RH using two toluene concentrations: 0.5% P/P 0 and 10% P/P 0 , mimicking environmental VOC and industrial concentrations, respectively. At 0.5% P/P 0 , MIL-PDMS-Sigma-0.25 exhibited 60% higher adsorption capacity and twice the rate of toluene capture relative to pristine MIL-101, as well as a 3-fold higher toluene uptake relative to a commercial activated carbon. Preliminary adsorbent regeneration experiments confirm the stability and performance of MIL-PDMS-Sigma-0.25. Using a simple vapor phase modification, this new MOF-composite material offers superior competitive toluene vapor uptake in humidified real-world conditions at VOC concentrations.
Publisher: Springer Science and Business Media LLC
Date: 16-09-2009
Publisher: Cambridge University Press (CUP)
Date: 30-06-2021
DOI: 10.33774/CHEMRXIV-2021-M8SR9-V2
Abstract: In this study, we investigate the use of surface-modified silica nanoparticles to improve the anti-fouling performance of PVDF ultrafiltration membranes. Here, fouling resistant nanoparticles were prepared by grafting monohydroxy-polydimethylsiloxane onto the surface of silica nanoparticles using Steglich esterification. The mixed matrix PVDF membranes were prepared at a range of nanoparticle concentrations (0, 1.6, 3.2, 6.3, and 11.8%) to understand how PDMS modified silica content affected membrane performance. The resulting hybrid membranes were characterised using a range of techniques including scanning electron microscopy (SEM), water contact angle (CA), porosity, and pore size measurements, in order to determine how morphological features of the nanocomposite membranes affected fouling and pure water flux. Embedding silica nanoparticles resulted in a significant reduction in membrane fouling, including lower protein adsorption and a flux recovery ratio of 97 %. Although water flux was reduced by the addition of nanoparticles, the change in the porosity, mean pore size and the hydrophilicity of the membrane caused the rejection rate to be increased significantly. Together, these results are of particular benefit to the ultrafiltration industry, where improved antifouling and flux recovery can help reduce operating and maintenance costs in these membrane processes. br / br /
Publisher: American Chemical Society (ACS)
Date: 26-03-2021
DOI: 10.26434/CHEMRXIV.14292293
Abstract: b ABSTRACT /b br / br / Competition between atmospheric moisture and volatile organic compounds (VOCs) for an adsorbent’s sites can significantly impact its VOC removal efficiency. The development of moisture-tolerant adsorbents is essential to address this issue. A vapor phase deposition process using polydimethylsiloxane (PDMS) has created a hydrophobic form of the highly porous, normally hydrophilic, MOF MIL-101. After optimizing the PDMS vapor deposition time and molecular weights, hydrophobicity index calculations verified the improved hydrophobicity of the coated MOF (MIL-PDMS-Sigma-0.25) over its pristine form. The surface area, pore volume as well as single component vapor adsorption of water and toluene capacities were also preserved, resulting to similar performance to MIL-101. Toluene-water vapor co-adsorption experiments were conducted at 40% RH using two toluene concentrations: 0.5% P/P sub /sub and 10% P/P sub /sub , mimicking environmental VOC and industrial concentrations, respectively. At 0.5% P/P sub /sub , MIL-PDMS-Sigma-0.25 exhibited 60% higher adsorption capacity and twice the rate of toluene capture relative to pristine MIL-101, as well as a 3-fold higher toluene uptake relative to a commercial activated carbon. Preliminary adsorbent regeneration experiments confirm the stability and performance of MIL-PDMS-Sigma-0.25. Using a simple vapor phase modification, this new MOF-composite material offers superior competitive toluene vapor uptake in humidified real-world conditions at VOC concentrations. /
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 04-2009
Publisher: Elsevier BV
Date: 04-2007
Publisher: MDPI AG
Date: 02-05-2011
DOI: 10.3390/MA4040845
Publisher: American Chemical Society (ACS)
Date: 27-10-2020
DOI: 10.26434/CHEMRXIV.13138997.V1
Abstract: Solvent induced enantioselectivity reversal is a rarely reported phenomenon in porous homochiral materials. Similar behaviour has been studied in chiral HPLC, where minor mobile phase modifications can induce elution order reversal. We report the first instance of solvent-induced enantioselectivity reversal for homochiral MOF ZnBLD, highlighting the complex enantioselectivity behaviour
Publisher: Elsevier BV
Date: 02-2007
Publisher: Wiley
Date: 21-08-2009
DOI: 10.1002/APJ.382
Publisher: American Chemical Society (ACS)
Date: 07-12-2022
Publisher: American Chemical Society (ACS)
Date: 15-07-2019
DOI: 10.26434/CHEMRXIV.8862239
Abstract: In this study, dabco MOF-1 (DMOF-1) with four different functional groups (NH sub /sub , NO sub /sub , Br and azobenzene) has been successfully synthesized through systematic control of the synthesis condition of their parent framework. The functionalised DMOF-1 is characterized using various analytical techniques including PXRD, TGA and N sub /sub sorption. The effect of the various functional groups on the performance of the MOFs for post-combustion CO sub /sub capture is evaluated. DMOF-1s with polar functional groups are found to have better affinity with CO sub /sub compared with the parent framework as indicated by higher CO sub /sub heat of adsorption. However, imparting steric hindrance to the framework as in Azo-DMOF-1 enhances CO sub /sub /N sub /sub selectivity, potentially as a result of lower N sub /sub affinity for the framework.
Publisher: American Chemical Society (ACS)
Date: 21-12-2020
DOI: 10.26434/CHEMRXIV.13399367.V1
Abstract: In this study, novel mixed matrix polyethersulfone (PES) membranes were synthesized by using two different kinds of metal organic frameworks (MOFs), namely UiO-66 and UiO-66-NH 2 . The composite membranes were characterised by SEM, EDX, FTIR, PXRD, water contact angle, porosity, pore size, etc. Membrane performance was investigated by water permeation flux, flux recovery ratio, fouling resistance and anti-fouling performance. The stability test was also conducted for the prepared mixed matrix membranes. A higher reduction in the water contact angle was observed after adding both MOFs to the PES and sulfonated PES membranes compared to pristine PES membranes. An enhancement in membrane performance was observed by embedding the MOF into PES membrane matrix, which may be attributed to the super-hydrophilic porous structure of UiO-66-NH 2 nanoparticles and hydrophilic structure of UiO-66 nanoparticles that could accelerate the exchange rate between solvent and non-solvent during the phase inversion process. By adding the MOFs into PES matrix, the flux recovery ratio was increased greatly (more than 99% for most mixed matrix membranes). The mixed matrix membranes showed higher resistance to protein adsorption compared to pristine PES membranes. After immersing the membranes in water for 3 months, 6 months and 12 months, both MOFs were stable and retained their structure. This study indicates that UiO-66 and UiO-66-NH 2 are great candidates for designing long-term stable mixed matrix membranes with higher anti-fouling performance.
Publisher: American Chemical Society (ACS)
Date: 04-11-2020
DOI: 10.26434/CHEMRXIV.13186982.V1
Abstract: In this study, we investigate the use of surface-modified silica nanoparticles to improve the anti-fouling performance of PVDF ultrafiltration membranes. Here, fouling resistant nanoparticles were prepared by grafting monohydroxy-polydimethylsiloxane onto the surface of silica nanoparticles using Steglich esterification. The mixed matrix PVDF membranes were prepared at a range of nanoparticle concentrations (0, 1.6, 3.2, 6.3, and 11.8%) to understand how PDMS modified silica content affected membrane performance. The resulting hybrid membranes were characterised using a range of techniques including scanning electron microscopy (SEM), water contact angle (CA), porosity, and pore size measurements, in order to determine how morphological features of the nanocomposite membranes affected fouling and pure water flux. Embedding silica nanoparticles resulted in a significant reduction in membrane fouling, including lower protein adsorption and a flux recovery ratio of 97 %. Although water flux was reduced by the addition of nanoparticles, the change in the porosity, mean pore size and the hydrophilicity of the membrane caused the rejection rate to be increased significantly. Together, these results are of particular benefit to the ultrafiltration industry, where improved antifouling and flux recovery can help reduce operating and maintenance costs in these membrane processes.
Publisher: MDPI AG
Date: 02-05-2011
DOI: 10.3390/MA4050845
Publisher: Wiley
Date: 20-09-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM04142D
Publisher: Elsevier BV
Date: 06-2015
Publisher: American Chemical Society (ACS)
Date: 27-11-2019
DOI: 10.26434/CHEMRXIV.10320752.V1
Abstract: Abstract: Removal of persistent organic compounds from aqueous solutions is generally achieved using adsorbent like activated carbon (AC) but it suffers from limited adsorption capacity due to low surface area. This paper describes a pioneering work on the adsorption of an organic pollutant, 2-chlorophenol (2-CP) by two MOFs with high surface area and water stability MIL-101 and its amino-derivative, MIL-101-NH 2 . Although MOFs have higher surface area than AC, the latter was proven better having the highest equilibrium 2-CP uptake (345 mg.g -1 ), followed by MIL-101 (121 mg.g -1 ) and MIL-101-NH 2 (84 mg.g -1 ). Used MIL-101 could be easily regenerated multiple times by washing with ethanol and even showed improved adsorption capacity after each washing cycle. These results can open the doors to meticulous adsorbent selection for treating 2-CP-contaminated water
Publisher: Elsevier BV
Date: 02-2022
Publisher: American Chemical Society (ACS)
Date: 27-11-2019
DOI: 10.26434/CHEMRXIV.10320752
Abstract: b Abstract: /b Removal of persistent organic compounds from aqueous solutions is generally achieved using adsorbent like activated carbon (AC) but it suffers from limited adsorption capacity due to low surface area. This paper describes a pioneering work on the adsorption of an organic pollutant, 2-chlorophenol (2-CP) by two MOFs with high surface area and water stability MIL-101 and its amino-derivative, MIL-101-NH sub /sub . Although MOFs have higher surface area than AC, the latter was proven better having the highest equilibrium 2-CP uptake (345 mg.g sup -1 /sup ), followed by MIL-101 (121 mg.g sup -1 /sup ) and MIL-101-NH sub /sub (84 mg.g sup -1 /sup ). Used MIL-101 could be easily regenerated multiple times by washing with ethanol and even showed improved adsorption capacity after each washing cycle. These results can open the doors to meticulous adsorbent selection for treating 2-CP-contaminated water
Publisher: SPIE
Date: 26-12-2008
DOI: 10.1117/12.810443
Publisher: Wiley
Date: 10-07-2021
Abstract: Solvent‐induced enantioselectivity reversal is a rarely reported phenomenon in porous homochiral materials. Similar behavior has been studied in chiral high performance liquid chromatography, where minor modifications to the mobile phase can induce elution order reversal of two enantiomers on a chiral stationary phase column. We report the first instance of solvent‐induced enantioselectivity reversal in a homochiral metal organic framework. Further, we highlight the complex enantioselectivity behavior of homochiral metal organic frameworks toward racemic mixtures in the presence of solvents through racemate‐solvent enantioselectivity and loading experiments as well as enantiopure‐solvent loading experiments. We hypothesize that this interesting selectivity reversal behavior is likely to be observed in other competitive adsorption, nonchiral selective processes involving a solvent.
Publisher: Wiley
Date: 10-2010
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CC02861G
Abstract: A visual representation of waste PLA being upcycled to a lactate containing MOF, ZnBLD–dPLA.
Publisher: American Chemical Society (ACS)
Date: 13-10-2020
DOI: 10.26434/CHEMRXIV.13072397
Abstract: The trade-off phenomenon between selectivity and permeation flux is a major challenge in pressure-driven membranes, and specifically for ultrafiltration membranes. Currently, many research studies have been performed to try to increase permeability while maintaining the rejection at a high level. However, in most of these studies, the improvement of permeability was accompanied by a decrease in rejection or vice versa. To tackle this problem, TiO2 nanoparticles were attached on the surface of PES membranes using polydopamine as adhesive agent. In general, it is quite challenging to attach/bind TiO2 on the surface of membranes due to agglomeration of nanoparticles. Therefore, we developed a practical, simple and a scalable method to attach TiO2 nanoparticles (NPs) on the top surface of membrane using one-step dip coating. Experimental results revealed that the modified layer enhanced the hydrophilicity of the PES UF membranes as confirmed by the decrease of contact angle from. As a result, the modified membranes exhibited a significant improvement in anti-fouling properties, with 12 times higher water permeation flux (962 LMH for pDA-f-TiO2-PES30) as compared to the pristine PES membranes (79.9 LMH). The static adsorption of BSA on the surface of membranes was reduced from (60 µg/cm2 for pristine PES to 21 µg/cm2 for pDA-f-TiO2- PES120). Furthermore, the modified PES membranes displayed a higher flux recovery ratio (97%) and fouling reversibility (98.62%) than pristine PES membrane (37.63%). Also, the coated PES membranes bestowed a good antibacterial property relative to the pristine one. Besides, the membranes showed better physical and chemical stability as compared with unmodified PES membranes. Thus, this study provided a facile approach for enhancing the anti-fouling performance of PES ultrafiltration membranes.
Publisher: American Chemical Society (ACS)
Date: 15-07-2019
DOI: 10.26434/CHEMRXIV.8862239.V1
Abstract: In this study, dabco MOF-1 (DMOF-1) with four different functional groups (NH 2 , NO 2 , Br and azobenzene) has been successfully synthesized through systematic control of the synthesis condition of their parent framework. The functionalised DMOF-1 is characterized using various analytical techniques including PXRD, TGA and N 2 sorption. The effect of the various functional groups on the performance of the MOFs for post-combustion CO 2 capture is evaluated. DMOF-1s with polar functional groups are found to have better affinity with CO 2 compared with the parent framework as indicated by higher CO 2 heat of adsorption. However, imparting steric hindrance to the framework as in Azo-DMOF-1 enhances CO 2 /N 2 selectivity, potentially as a result of lower N 2 affinity for the framework.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA03553A
Abstract: A new and robust generation-2 light-responsive MOF with UiO-66 topology applicable for post combustion CO 2 capture has been successfully synthesized and is described in this article.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1RE00038A
Abstract: A comprehensive review on integrating microfluidic reactors with in situ sensors for reaction probing of chemical transformation.
Publisher: American Chemical Society (ACS)
Date: 11-12-2017
DOI: 10.1021/JACS.7B10112
Abstract: Efficient chiral separation remains a very challenging task due to the identical physical and chemical properties of the enantiomers of a molecule. Enantiomers only behave differently from each other in the presence of other chiral species. Homochiral metal-organic frameworks (MOFs) have received much attention for their promising enantioseparation properties. However, there are still challenges to overcome in this field such as high enantiomeric separation. Structural defects play an important role in the properties of MOFs and can significantly change the pore architecture. In this work, we introduced missing linker defects into a homochiral metal-organic framework [Zn
Publisher: American Chemical Society (ACS)
Date: 06-03-2009
DOI: 10.1021/LA900023P
Abstract: In this paper, we report the successful synthesis of amine-functionalized FDU-12-type mesoporous silica with a very large pore (30.2 nm) and a highly ordered mesostructure by using 3-aminopropyltriethoxysilane (APTES) as an organosilane source. Small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) measurements confirmed that the materials possessed a face-centered cubic (space group Fm3m) mesostructure. Different techniques were used to obtain a significant pore and entrance size enlargement: low synthesis temperature and high hydrothermal treatment temperature. The amount of amine organosilane influenced the mesostructure of the mesoporous silica. It was found that the addition of inorganic salt (KCl) could help to maintain an ordered structure of the large pore mesoporous material. X-ray photoelectron spectroscopy (XPS), solid-state magic-angle spinning (MAS) 13C nuclear magnetic resonance (NMR) and thermogravimetric analysis (TGA) verified the incorporation of amine functional groups on the surface of the materials. The addition of amine organosilane extended the synthesis temperature domain of ordered FDU-12 materials. The amine functional group significantly enhanced the adsorption capacity of the mesoporous materials, e.g., the amine functionalized mesoporous silica had 8-fold higher bovine serum albumin (BSA) adsorption capacity than that of the unfunctionalized one. It also had 2 times higher adsorption capacity for large cellulase enzymes. The amine functional group introduced positively charged groups on the surface of the mesoporous silica, which created strong electrostatic interactions between the protein and the silica.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CC33292B
Abstract: For the first time a top-down process was used to control the spatial location of Metal-Organic Frameworks on a surface. Deep X-ray lithography was utilised to micropattern a Zeolitic Imidazolate Framework layer on a sol-gel surface, with exposure hardening the sol-gel by inducing crosslinking while leaving the frameworks intact.
Publisher: Elsevier BV
Date: 07-2012
Publisher: Elsevier BV
Date: 05-03-2009
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA05524B
Abstract: Composite BPPO/DETA ultrafiltration membranes show decreased membrane fouling and enhanced protein rejection with very high flux recovery ratios.
Publisher: American Chemical Society (ACS)
Date: 08-05-2020
DOI: 10.26434/CHEMRXIV.12262010.V1
Abstract: Abstract A new synthesis method was developed to prepare an aluminum-based metal organic framework (MIL-96) with a larger particle size and different crystal habits. A low cost and water-soluble polymer, hydrolyzed polyacrylamide (HPAM), was added in varying quantities into the synthesis reaction to achieve % particle size enlargement with controlled crystal morphology. The modified adsorbent, MIL-96-RHPAM2, was systematically characterized by SEM, XRD, FTIR, BET and TGA-MS. Using activated carbon (AC) as a reference adsorbent, the effectiveness of MIL-96-RHPAM2 for perfluorooctanoic acid (PFOA) removal from water was examined. The study confirms stable morphology of hydrated MIL-96-RHPAM2 particles as well as a superior PFOA adsorption capacity (340 mg/g) despite its lower surface area, relative to standard MIL-96. MIL-96-RHPAM2 suffers from slow adsorption kinetics as the modification significantly blocks pore access. The strong adsorption of PFOA by MIL-96-RHPAM2 was associated with the formation of electrostatic bonds between the anionic carboxylate of PFOA and the amine functionality present in the HPAM backbone. Thus, the strongly held PFOA molecules in the pores of MIL-96-RHPAM2 were not easily desorbed even after eluted with a high ionic strength solvent (500 mM NaCl). Nevertheless, this simple HPAM addition strategy can still chart promising pathways to impart judicious control over adsorbent particle size and crystal shapes while the introduction of amine functionality onto the surface chemistry is simultaneously useful for enhanced PFOA removal from contaminated aqueous systems.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA04686G
Abstract: This paper provides a comprehensive statistical study on the topic of ion exchange membranes and may provide an avenue for future research work in this field.
Publisher: American Chemical Society (ACS)
Date: 22-05-2020
DOI: 10.26434/CHEMRXIV.12262010.V2
Abstract: Abstract A new synthesis method was developed to prepare an aluminum-based metal organic framework (MIL-96) with a larger particle size and different crystal habits. A low cost and water-soluble polymer, hydrolyzed polyacrylamide (HPAM), was added in varying quantities into the synthesis reaction to achieve % particle size enlargement with controlled crystal morphology. The modified adsorbent, MIL-96-RHPAM2, was systematically characterized by SEM, XRD, FTIR, BET and TGA-MS. Using activated carbon (AC) as a reference adsorbent, the effectiveness of MIL-96-RHPAM2 for perfluorooctanoic acid (PFOA) removal from water was examined. The study confirms stable morphology of hydrated MIL-96-RHPAM2 particles as well as a superior PFOA adsorption capacity (340 mg/g) despite its lower surface area, relative to standard MIL-96. MIL-96-RHPAM2 suffers from slow adsorption kinetics as the modification significantly blocks pore access. The strong adsorption of PFOA by MIL-96-RHPAM2 was associated with the formation of electrostatic bonds between the anionic carboxylate of PFOA and the amine functionality present in the HPAM backbone. Thus, the strongly held PFOA molecules in the pores of MIL-96-RHPAM2 were not easily desorbed even after eluted with a high ionic strength solvent (500 mM NaCl). Nevertheless, this simple HPAM addition strategy can still chart promising pathways to impart judicious control over adsorbent particle size and crystal shapes while the introduction of amine functionality onto the surface chemistry is simultaneously useful for enhanced PFOA removal from contaminated aqueous systems.
Publisher: American Chemical Society (ACS)
Date: 10-01-2019
DOI: 10.26434/CHEMRXIV.7571186
Abstract: b Abstract /b Grain boundaries are an unavoidable microstructural feature in intergrown polycrystalline metal-organic framework (MOF) membranes. They have been suspected to be less size-selective than a MOF’s micropores, resulting in suboptimal separation performances – a speculation recently confirmed by transmission electron microscopy of MOF ZIF-8. Single-crystal membranes, without grain boundaries, should confine mass transport to micropores and reflect the intrinsic selectivity of the porous material. Here, we demonstrate the feasibility of fabricating single-crystal MOF membranes and directly measuring gas permeability through such a membrane using ZIF-8 as an exemplary MOF. Our single-crystal ZIF-8 membranes achieved ideal selectivities up to 28.9, 10.0, 40.1 and 3.6 for gas pairs CO sub /sub /N sub /sub , CO sub /sub /CH sub /sub , He/CH sub /sub and CH sub /sub /N sub /sub respectively, much higher than or reversely selective to over 20 polycrystalline ZIF-8 membranes, unequivocally proving the non-selectivity of grain boundaries. The permeability trend obtained in single-crystal membranes aligned with a force field that had been validated against multiple empirical adsorption isotherms. br /
Publisher: American Chemical Society (ACS)
Date: 07-04-2007
DOI: 10.1021/CM0628698
Publisher: Springer Berlin Heidelberg
Date: 25-10-2011
Publisher: Springer Berlin Heidelberg
Date: 25-10-2011
Publisher: Elsevier BV
Date: 2021
Publisher: Springer Berlin Heidelberg
Date: 25-10-2011
Publisher: American Chemical Society (ACS)
Date: 20-07-2022
DOI: 10.26434/CHEMRXIV-2022-46W7S
Abstract: Photocatalysis for organic synthesis has experienced rapid progress over the last decades, which serves as an alternative to conventional synthetic routines. However, the photochemical reactor setup of many published works remains ambiguous due to missing standardized protocols. Therefore, a general design of batch photoreactor is required to circumvent the problem of difficult reproducibility and experimental inconsistencies. In this report which we have termed a technical note, a novel batch photoreactor with temperature feedback control and modulated light intensity was assembled from several low-cost, commercially available components, which will assist other researchers to reproduce this standardized reactor for use in their own research.
Publisher: Springer Berlin Heidelberg
Date: 25-10-2011
Publisher: Elsevier BV
Date: 09-2011
Publisher: Springer Berlin Heidelberg
Date: 25-10-0001
Publisher: Springer Berlin Heidelberg
Date: 25-10-2011
Publisher: Springer Berlin Heidelberg
Date: 25-10-2011
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2EE21743K
Publisher: Informa UK Limited
Date: 05-2009
DOI: 10.5004/DWT.2009.549
Publisher: American Chemical Society (ACS)
Date: 10-01-2019
DOI: 10.26434/CHEMRXIV.7568696
Abstract: b Abstract /b br / In this paper, we report a simple approach to study the fundamental aspect of light-responsive metal organic framework (MOF) in UiO-66 topology through a mixed-ligand approach. Apart from change in the structural property, the loading of azobenzene linker inside the framework also affects the CO sub /sub light-responsive property and CO sub /sub /N sub /sub selectivity which could help to design future low-energy CO sub /sub adsorbents. Further study to incorporate the MOFs into mixed matrix membranes also indicates the benefit of higher azobenzene loading in the MOF to enhance the CO2/N2 separation performance since it can improve the separation performance which could not be obtained in non-functionalized fillers. / br / b Data Repository /b / Research data and additional high-resolution images are available from the open repository: 0.5281/zenodo.2533852 /
Publisher: Springer Science and Business Media LLC
Date: 17-10-2017
DOI: 10.1038/S41598-017-13536-4
Abstract: In this paper, we demonstrate the highly efficient photo-switching ability of a Cu-azobenzene tetracarboxylate MOF (JUC-62) for low-energy CO 2 capture. Under UV light irradiation, both at 273 and 298 K, JUC-62 showed 51% and 34% lower CO 2 uptake, respectively, than when UV light was off. Its dynamic CO 2 uptake also matched well with its static condition. Storing it at ambient condition was also found not to destroy its framework structure and its dynamic photoswitching property could still be maintained.
Publisher: American Chemical Society (ACS)
Date: 19-07-2011
DOI: 10.1021/JP112157Z
Publisher: American Chemical Society (ACS)
Date: 16-01-2019
DOI: 10.26434/CHEMRXIV.7593902.V1
Abstract: Abstract As a nanoporous polymer, Azo-COP-2 has been reported for having exceptional CO 2 /N 2 separation performance. In this study, we further investigate the application of Azo-COP-2 as a potential for low-energy CO 2 adsorbent and porous filler in mixed matrix membranes for CO 2 /N 2 separation. As an adsorbent, thanks to the presence of azobenzene in its framework, Azo-COP-2 showed lower CO 2 uptake when irradiated with UV light than its normal condition. Azo-COP-2 also exhibited a highly efficient CO 2 photoswitching between its irradiated and non-irradiated state that has not been observed previously in any nanoporous polymer. Combined with high CO 2 /N 2 selectivity, this property renders Azo-COP-2 to be an excellent candidate for low-energy CO 2 capture. A beneficial property was also exhibited by Azo-COP-2 once they were used as porous filler in mixed-matrix membranes (MMMs) using three different polymer matrices: Matrimid, polysulfone and PIM-1. Both permeability and selectivity of the MMMs could be simultaneously improved once ideal interaction between Azo-COP-2 and the polymer could be established. It was found that Azo-COP-2 – polysulfone composites had the best performance. In this case, it was observed that the CO 2 permeability and CO2/N2 selectivity could be increased up to 160% and 66.7%, respectively. The strategy then shows the great potential of Azo-COP-2 not only for an advanced low-energy CO 2 adsorbent but also to improve the performance of conventional polymeric membrane for CO 2 post-combustion capture.
Publisher: Springer Science and Business Media LLC
Date: 13-02-2018
DOI: 10.1038/S41598-018-21263-7
Abstract: The performance of two generation-3 light-responsive metal-organic framework (MOF), namely JUC-62 and PCN-250, was investigated in a mixed matrix membrane (MMM) form. Both of them were incorporated inside the matrimid as the polymer matrix. Using our custom-designed membrane testing cell, it was observed that the MMMs showed up to 9% difference in CO 2 permeability between its pristine and UV-irradiated condition. This shows that the light-responsive ability of the light-responsive MOFs could still be maintained. Thus, this finding is applicable in designing a smart material. Apart from that, the MMMs also has the potential to be applied for post-combustion carbon capture. At loadings up to 15 wt%, both CO 2 permeability and CO 2 /N 2 ideal selectivity could be significantly improved and surpassed the value exhibited by most of the MOF-matrimid MMM. Lastly the long term performance of the MMM was also evaluated and it was observed that both MMM could maintain their performance up to 1 month with only a slight decrease in CO 2 permeability observed for 10 wt% PCN-250-matrimid. This study then opens up the possibility to fabricate a novel anti-aging multifunctional membrane material that is applicable as a smart material and also in post combustion carbon capture applications.
Publisher: American Chemical Society (ACS)
Date: 12-06-2019
DOI: 10.26434/CHEMRXIV.8256170
Abstract: The synthesis of cation exchange membranes (CEMs) usually involves using organic solvents and/or sulfonation process. In this study, rapid and scalable synthesis of high performance CEMs is achieved without organic solvents and sulfonation. The synthesis is carried out via in-situ polymerization of lithium styrene sulfonate in porous support. Different preparation procedures are developed and optimized. Functional sulfonate groups were successfully loaded onto and into the membrane support, as verified by FTIR. Besides, water plays an important role during membrane synthesis. By reducing the amount of water used, the ratio of functional polymers to membrane support in the synthesized CEMs is increased. Therefore, the synthesized CEMs show increased ion exchange capacity (IEC). This is significant because it means that high IEC can be achieved without introducing cation exchange resins to the membranes. Finally, the synthesized membranes demonstrate excellent desalination performance, which is comparable to that of commercial membranes. This new methodology may shed new light on preparing CEMs in an efficient and eco-friendly way.
Publisher: Wiley
Date: 04-2009
Publisher: American Chemical Society (ACS)
Date: 25-04-2019
DOI: 10.26434/CHEMRXIV.8040131.V1
Abstract: Waste PLA can be upcycled to metal organic frameworks of potential high value in a one-pot synthesis scheme, where PLA depolymerisation occurs in-situ . Three lactate based frameworks were succesfully synthesised and characterised from PLA as a feed source, including homochiral framework ZnBLD. The chiral separation ability of ZnBLD was maintained. Additional data including the CIF file, the CheckCIF document, and the raw XRD spectra, are available from the Zenodo repository linked below.
Publisher: American Chemical Society (ACS)
Date: 15-02-2012
DOI: 10.1021/EF201694Y
Publisher: American Chemical Society (ACS)
Date: 22-05-2020
DOI: 10.26434/CHEMRXIV.12262010
Abstract: b Abstract /b / A new synthesis method was developed to prepare an aluminum-based metal organic framework (MIL-96) with a larger particle size and different crystal habits. A low cost and water-soluble polymer, hydrolyzed polyacrylamide (HPAM), was added in varying quantities into the synthesis reaction to achieve % particle size enlargement with controlled crystal morphology. The modified adsorbent, MIL-96-RHPAM2, was systematically characterized by SEM, XRD, FTIR, BET and TGA-MS. Using activated carbon (AC) as a reference adsorbent, the effectiveness of MIL-96-RHPAM2 for perfluorooctanoic acid (PFOA) removal from water was examined. The study confirms stable morphology of hydrated MIL-96-RHPAM2 particles as well as a superior PFOA adsorption capacity (340 mg/g) despite its lower surface area, relative to standard MIL-96. MIL-96-RHPAM2 suffers from slow adsorption kinetics as the modification significantly blocks pore access. The strong adsorption of PFOA by MIL-96-RHPAM2 was associated with the formation of electrostatic bonds between the anionic carboxylate of PFOA and the amine functionality present in the HPAM backbone. Thus, the strongly held PFOA molecules in the pores of MIL-96-RHPAM2 were not easily desorbed even after eluted with a high ionic strength solvent (500 mM NaCl). Nevertheless, this simple HPAM addition strategy can still chart promising pathways to impart judicious control over adsorbent particle size and crystal shapes while the introduction of amine functionality onto the surface chemistry is simultaneously useful for enhanced PFOA removal from contaminated aqueous systems. br /
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA06248C
Abstract: This paper demonstrates a new methodology for preparing cation exchange membranes in an effective and environment-friendly way.
Publisher: Springer Science and Business Media LLC
Date: 21-05-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B925357B
Publisher: American Chemical Society (ACS)
Date: 07-02-2019
DOI: 10.26434/CHEMRXIV.7593902.V2
Abstract: Abstract As a nanoporous polymer, Azo-COP-2 has been reported for having exceptional CO 2 /N 2 separation performance. In this study, we further investigate the application of Azo-COP-2 as a potential for low-energy CO 2 adsorbent and porous filler in mixed matrix membranes for CO 2 /N 2 separation. As an adsorbent, thanks to the presence of azobenzene in its framework, Azo-COP-2 showed lower CO 2 uptake when irradiated with UV light than its normal condition. Azo-COP-2 also exhibited a highly efficient CO 2 photoswitching between its irradiated and non-irradiated state that has not been observed previously in any nanoporous polymer. Combined with high CO 2 /N 2 selectivity, this property renders Azo-COP-2 to be an excellent candidate for low-energy CO 2 capture. A beneficial property was also exhibited by Azo-COP-2 once they were used as porous filler in mixed-matrix membranes (MMMs) using three different polymer matrices: Matrimid, polysulfone and PIM-1. Both permeability and selectivity of the MMMs could be simultaneously improved once ideal interaction between Azo-COP-2 and the polymer could be established. It was found that Azo-COP-2 – polysulfone composites had the best performance. In this case, it was observed that the CO 2 permeability and CO2/N2 selectivity could be increased up to 160% and 66.7%, respectively. The strategy then shows the great potential of Azo-COP-2 not only for an advanced low-energy CO 2 adsorbent but also to improve the performance of conventional polymeric membrane for CO 2 post-combustion capture.
Publisher: Wiley
Date: 20-08-2010
Abstract: Fuel cell performance is determined by the complex interplay of mass transport, energy transfer and electrochemical processes. The convolution of these processes leads to spatial heterogeneity in the way that fuel cells perform, particularly due to reactant consumption, water management and the design of fluid-flow plates. It is therefore unlikely that any bulk measurement made on a fuel cell will accurately represent performance at all parts of the cell. The ability to make spatially resolved measurements in a fuel cell provides one of the most useful ways in which to monitor and optimise performance. This Minireview explores a range of in situ techniques being used to study fuel cells and describes the use of novel experimental techniques that the authors have used to develop an 'experimental functional map' of fuel cell performance. These techniques include the mapping of current density, electrochemical impedance, electrolyte conductivity, contact resistance and CO poisoning distribution within working PEFCs, as well as mapping the flow of reactant in gas channels using laser Doppler anemometry (LDA). For the high-temperature solid oxide fuel cell (SOFC), temperature mapping, reference electrode placement and the use of Raman spectroscopy are described along with methods to map the microstructural features of electrodes. The combination of these techniques, applied across a range of fuel cell operating conditions, allows a unique picture of the internal workings of fuel cells to be obtained and have been used to validate both numerical and analytical models.
Publisher: American Chemical Society (ACS)
Date: 10-01-2019
DOI: 10.26434/CHEMRXIV.7568696.V1
Abstract: Abstract In this paper, we report a simple approach to study the fundamental aspect of light-responsive metal organic framework (MOF) in UiO-66 topology through a mixed-ligand approach. Apart from change in the structural property, the loading of azobenzene linker inside the framework also affects the CO 2 light-responsive property and CO 2 /N 2 selectivity which could help to design future low-energy CO 2 adsorbents. Further study to incorporate the MOFs into mixed matrix membranes also indicates the benefit of higher azobenzene loading in the MOF to enhance the CO2/N2 separation performance since it can improve the separation performance which could not be obtained in non-functionalized fillers. Data Repository Research data and additional high-resolution images are available from the open repository: 0.5281/zenodo.2533852
Publisher: Springer Berlin Heidelberg
Date: 2012
Publisher: American Chemical Society (ACS)
Date: 12-06-2019
DOI: 10.26434/CHEMRXIV.8256170.V1
Abstract: The synthesis of cation exchange membranes (CEMs) usually involves using organic solvents and/or sulfonation process. In this study, rapid and scalable synthesis of high performance CEMs is achieved without organic solvents and sulfonation. The synthesis is carried out via in-situ polymerization of lithium styrene sulfonate in porous support. Different preparation procedures are developed and optimized. Functional sulfonate groups were successfully loaded onto and into the membrane support, as verified by FTIR. Besides, water plays an important role during membrane synthesis. By reducing the amount of water used, the ratio of functional polymers to membrane support in the synthesized CEMs is increased. Therefore, the synthesized CEMs show increased ion exchange capacity (IEC). This is significant because it means that high IEC can be achieved without introducing cation exchange resins to the membranes. Finally, the synthesized membranes demonstrate excellent desalination performance, which is comparable to that of commercial membranes. This new methodology may shed new light on preparing CEMs in an efficient and eco-friendly way.
Publisher: American Chemical Society (ACS)
Date: 10-01-2019
DOI: 10.26434/CHEMRXIV.7571186.V1
Abstract: Abstract Grain boundaries are an unavoidable microstructural feature in intergrown polycrystalline metal-organic framework (MOF) membranes. They have been suspected to be less size-selective than a MOF’s micropores, resulting in suboptimal separation performances – a speculation recently confirmed by transmission electron microscopy of MOF ZIF-8. Single-crystal membranes, without grain boundaries, should confine mass transport to micropores and reflect the intrinsic selectivity of the porous material. Here, we demonstrate the feasibility of fabricating single-crystal MOF membranes and directly measuring gas permeability through such a membrane using ZIF-8 as an exemplary MOF. Our single-crystal ZIF-8 membranes achieved ideal selectivities up to 28.9, 10.0, 40.1 and 3.6 for gas pairs CO 2 /N 2 , CO 2 /CH 4 , He/CH 4 and CH 4 /N 2 respectively, much higher than or reversely selective to over 20 polycrystalline ZIF-8 membranes, unequivocally proving the non-selectivity of grain boundaries. The permeability trend obtained in single-crystal membranes aligned with a force field that had been validated against multiple empirical adsorption isotherms.
Publisher: American Chemical Society (ACS)
Date: 25-04-2019
DOI: 10.26434/CHEMRXIV.8040131
Abstract: Waste PLA can be upcycled to metal organic frameworks of potential high value in a one-pot synthesis scheme, where PLA depolymerisation occurs i in-situ /i . Three lactate based frameworks were succesfully synthesised and characterised from PLA as a feed source, including homochiral framework ZnBLD. The chiral separation ability of ZnBLD was maintained. br br Additional data including the CIF file, the CheckCIF document, and the raw XRD spectra, are available from the Zenodo repository linked below. br
Publisher: American Chemical Society (ACS)
Date: 16-05-2019
Publisher: American Chemical Society (ACS)
Date: 30-06-2021
DOI: 10.26434/CHEMRXIV-2021-M8SR9-V2
Abstract: In this study, we investigate the use of surface-modified silica nanoparticles to improve the anti-fouling performance of PVDF ultrafiltration membranes. Here, fouling resistant nanoparticles were prepared by grafting monohydroxy-polydimethylsiloxane onto the surface of silica nanoparticles using Steglich esterification. The mixed matrix PVDF membranes were prepared at a range of nanoparticle concentrations (0, 1.6, 3.2, 6.3, and 11.8%) to understand how PDMS modified silica content affected membrane performance. The resulting hybrid membranes were characterised using a range of techniques including scanning electron microscopy (SEM), water contact angle (CA), porosity, and pore size measurements, in order to determine how morphological features of the nanocomposite membranes affected fouling and pure water flux. Embedding silica nanoparticles resulted in a significant reduction in membrane fouling, including lower protein adsorption and a flux recovery ratio of 97 %. Although water flux was reduced by the addition of nanoparticles, the change in the porosity, mean pore size and the hydrophilicity of the membrane caused the rejection rate to be increased significantly. Together, these results are of particular benefit to the ultrafiltration industry, where improved antifouling and flux recovery can help reduce operating and maintenance costs in these membrane processes.
Publisher: Wiley
Date: 27-05-2019
Abstract: A chiral, octahedral M
Publisher: American Chemical Society (ACS)
Date: 09-10-2020
DOI: 10.26434/CHEMRXIV.13072397.V1
Abstract: The trade-off phenomenon between selectivity and permeation flux is a major challenge in pressure-driven membranes, and specifically for ultrafiltration membranes. Currently, many research studies have been performed to try to increase permeability while maintaining the rejection at a high level. However, in most of these studies, the improvement of permeability was accompanied by a decrease in rejection or vice versa. To tackle this problem, TiO2 nanoparticles were attached on the surface of PES membranes using polydopamine as adhesive agent. In general, it is quite challenging to attach/bind TiO2 on the surface of membranes due to agglomeration of nanoparticles. Therefore, we developed a practical, simple and a scalable method to attach TiO2 nanoparticles (NPs) on the top surface of membrane using one-step dip coating. Experimental results revealed that the modified layer enhanced the hydrophilicity of the PES UF membranes as confirmed by the decrease of contact angle from. As a result, the modified membranes exhibited a significant improvement in anti-fouling properties, with 12 times higher water permeation flux (962 LMH for pDA-f-TiO2-PES30) as compared to the pristine PES membranes (79.9 LMH). The static adsorption of BSA on the surface of membranes was reduced from (60 µg/cm2 for pristine PES to 21 µg/cm2 for pDA-f-TiO2- PES120). Furthermore, the modified PES membranes displayed a higher flux recovery ratio (97%) and fouling reversibility (98.62%) than pristine PES membrane (37.63%). Also, the coated PES membranes bestowed a good antibacterial property relative to the pristine one. Besides, the membranes showed better physical and chemical stability as compared with unmodified PES membranes. Thus, this study provided a facile approach for enhancing the anti-fouling performance of PES ultrafiltration membranes.
Publisher: American Chemical Society (ACS)
Date: 13-10-2020
DOI: 10.26434/CHEMRXIV.13072397.V2
Abstract: The trade-off phenomenon between selectivity and permeation flux is a major challenge in pressure-driven membranes, and specifically for ultrafiltration membranes. Currently, many research studies have been performed to try to increase permeability while maintaining the rejection at a high level. However, in most of these studies, the improvement of permeability was accompanied by a decrease in rejection or vice versa. To tackle this problem, TiO2 nanoparticles were attached on the surface of PES membranes using polydopamine as adhesive agent. In general, it is quite challenging to attach/bind TiO2 on the surface of membranes due to agglomeration of nanoparticles. Therefore, we developed a practical, simple and a scalable method to attach TiO2 nanoparticles (NPs) on the top surface of membrane using one-step dip coating. Experimental results revealed that the modified layer enhanced the hydrophilicity of the PES UF membranes as confirmed by the decrease of contact angle from. As a result, the modified membranes exhibited a significant improvement in anti-fouling properties, with 12 times higher water permeation flux (962 LMH for pDA-f-TiO2-PES30) as compared to the pristine PES membranes (79.9 LMH). The static adsorption of BSA on the surface of membranes was reduced from (60 µg/cm2 for pristine PES to 21 µg/cm2 for pDA-f-TiO2- PES120). Furthermore, the modified PES membranes displayed a higher flux recovery ratio (97%) and fouling reversibility (98.62%) than pristine PES membrane (37.63%). Also, the coated PES membranes bestowed a good antibacterial property relative to the pristine one. Besides, the membranes showed better physical and chemical stability as compared with unmodified PES membranes. Thus, this study provided a facile approach for enhancing the anti-fouling performance of PES ultrafiltration membranes.
Publisher: American Chemical Society (ACS)
Date: 04-11-2020
DOI: 10.26434/CHEMRXIV.13186982
Abstract: In this study, we investigate the use of surface-modified silica nanoparticles to improve the anti-fouling performance of PVDF ultrafiltration membranes. Here, fouling resistant nanoparticles were prepared by grafting monohydroxy-polydimethylsiloxane onto the surface of silica nanoparticles using Steglich esterification. The mixed matrix PVDF membranes were prepared at a range of nanoparticle concentrations (0, 1.6, 3.2, 6.3, and 11.8%) to understand how PDMS modified silica content affected membrane performance. The resulting hybrid membranes were characterised using a range of techniques including scanning electron microscopy (SEM), water contact angle (CA), porosity, and pore size measurements, in order to determine how morphological features of the nanocomposite membranes affected fouling and pure water flux. Embedding silica nanoparticles resulted in a significant reduction in membrane fouling, including lower protein adsorption and a flux recovery ratio of 97 %. Although water flux was reduced by the addition of nanoparticles, the change in the porosity, mean pore size and the hydrophilicity of the membrane caused the rejection rate to be increased significantly. Together, these results are of particular benefit to the ultrafiltration industry, where improved antifouling and flux recovery can help reduce operating and maintenance costs in these membrane processes. br br
Publisher: Elsevier BV
Date: 04-2011
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2011
End Date: 2014
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 2027
Funder: German Research Foundation
View Funded ActivityStart Date: 2021
End Date: 2027
Funder: German Research Foundation
View Funded ActivityStart Date: 2014
End Date: 2017
Funder: Australian Research Council
View Funded ActivityStart Date: 2012
End Date: 2013
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 2011
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 12-2011
Amount: $1,294,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2014
End Date: 12-2017
Amount: $1,633,554.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 12-2014
Amount: $360,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 01-2012
End Date: 12-2013
Amount: $300,000.00
Funder: Australian Research Council
View Funded Activity