ORCID Profile
0000-0003-4648-201X
Current Organisations
Hong Kong Civil Engineering and Development Department
,
University of Technology Sydney
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Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 06-2022
Publisher: Penerbit UTHM
Date: 14-11-2022
DOI: 10.30880/IJSCET.2022.13.04.021
Abstract: This paper presents an experimental study to analyse the bonding strength between geopolymer concrete (GC) and normal concrete (NC) bond substrate. Three different strengths of GC which were 80 MPa, 85 MPa and 90 MPa were bonded to 30 MPa NC and denoted asNC30-GC80, NC30-GC85 and NC30-GC90. Slant shear and split tensile tests were conducted to investigate the bonding strength between two different substrates. The effect of bonding was then determined by using Mohr-Coulomb theory where critical bonding condition (smooth surface) was created. From the analysis, it was found that NC30-GC80 had the most powerful self-adhesion between GC towards NC. This result indicated the highest bonding strength of GC to NC at critical condition. Such strong bond was obtained by the effect of self-adhesive from GC to NC. The self-adhesive characteristic which represented by pure shear strength was obtained from Mohr-Coulomb theory.
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 03-2023
Publisher: MDPI AG
Date: 11-2018
DOI: 10.3390/MIN8110496
Abstract: Calcium ions are a kind of unavoidable ions in water. It has the deleterious effect on molybdenite flotation. High-calcium flotation wastewater (HCFW) was reused for flotation circuits after the pretreatment removing Ca2+ in from HCFW. The high cost of wastewater treatment limits HCFW reuse. In this paper, an efficient, innovative, low-cost and environmental-friendly flotation wastewater reuse technology was introduced. XLM, as a composite collector for molybdenite, is a mixture of diesel oil (DO) and polycyclic aromatic hydrocarbons (PAHs). It could reduce the deleterious effects of Ca2+ on the flotation of molybdenite in HCFW. Therefore, this was used to replace the pretreatment removing Ca2+ in from high Ca2+ wastewater and saved the cost of wastewater treatment. When XLM consists of 4 wt % PAHs and 96 wt % DO, it has better adaptability than DO in the different Ca2+ concentration of flotation water. The contact angle measurements indicated that PAHs, as a synergistic component of a composite collector, could adsorb on the edges of molybdenite in the presence of Ca2+ by forming PAHs-Ca2+-MoO42− structure to increase the contact angle of fine molybdenite particle and reduce the deleterious effects of Ca2+ on the flotation of molybdenite. The industrial-scale test further that demonstrated XLM can improve the molybdenite roughing recovery and grade by 1.8% and 3.46% compared with DO as the collector in high Ca2+ flotation wastewater. It is feasible and effective to replace high-cost wastewater treatment for molybdenum plants.
Publisher: Elsevier BV
Date: 11-2012
Publisher: Computers, Materials and Continua (Tech Science Press)
Date: 2021
Publisher: American Chemical Society (ACS)
Date: 11-05-2022
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 08-2021
Publisher: MDPI AG
Date: 09-08-2017
DOI: 10.3390/MIN7080141
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 05-2022
Publisher: Shanghai Institute of Ceramics
Date: 2016
DOI: 10.15541/JIM20150283
Publisher: Bentham Science Publishers Ltd.
Date: 12-2022
DOI: 10.2174/1570179419666220509143654
Abstract: and objective: As a key pharmacophore, the cyano group widely exists in a variety of biologically active compounds. Besides, nitriles are also valuable intermediates for many common functional groups. In this current work, a new synthesis strategy was developed to obtain nitriles from aldehydes. Using commercially available aldehydes as raw materials, and hydroxylamine and hydrochloride as nitrogen sources, the corresponding nitrile compounds were successfully synthesized by the one-pot method through the promotion of imidazole hydrochloride. And it was characterized by 1H NMR, 13C NMR, and mass spectrometry. Various reaction conditions were applied in order to find an optimum and convenient procedure for the formation of nitriles. The highest yields (95%) were achieved using sulfolane as a solvent, and imidazole hydrochloride as a promoter. In conclusion, we developed a new synthetic method for nitrile compounds from aldehydes. Twenty seven ex les of functionalized nitrile compounds have been synthesized in good to excellent yields. This methodology features that an environmentally benign imidazole hydrochloride replaces transition metal catalysts and oxidants required in conventional strategies to convert aldehydes into nitriles with good functional group tolerability. Further exploration of imidazole hydrochloride is ongoing in our laboratory.
Publisher: Elsevier BV
Date: 11-2020
Publisher: MDPI AG
Date: 31-03-2023
DOI: 10.3390/APP13074455
Abstract: A visual measurement method based on a key point detection network is proposed for the difficulty of fitting the cross-sectional profile of ultra-narrow gap welds and the low efficiency and accuracy of manual measurement of geometric parameters. First, the HRnet (High-Resolution Net) key point detection algorithm was used to train the feature point detection model, and 18 profile feature points in a “measurement unit” were extracted. Secondly, the feature point coordinates are transformed from the image coordinate system to the weld coordinate system, and the weld profiles are fitted by the least squares method. Finally, the measurement system is calibrated with a coplanar linear calibration algorithm to perform pixel distance to actual distance conversion for quantitative detection of geometric dimensions. The experimental results show that the accuracy of the proposed method for key point localization is 95.6%, the mean value of the coefficient of determination R-square for curve fitting is greater than 94%, the absolute error of measurement is between 0.06 and 0.15 mm, and the relative error is between 1.27% and 3.12%. The measurement results are more reliable, and the efficiency is significantly improved compared to manual measurement.
Publisher: Elsevier BV
Date: 12-2022
Publisher: American Chemical Society (ACS)
Date: 13-07-2016
DOI: 10.1021/ACS.INORGCHEM.6B00971
Abstract: Organic metalloporphyrins and inorganic polyoxometalates (POMs) are two kinds of efficient molecular catalysts to prompt a variety of chemical reactions. They have been used as active moieties for the synthesis of porous materials to realize highly efficient heterogeneous catalysis. Both of them are regarded as the organic/inorganic equivalent counterparts to complement the in idual features. Therefore, the combination of metalloporphyrins and POMs in the same hybrid materials might generate interesting catalytic properties by emerging their unique in idual functions. To avoid the random connections between metalloporphyrins, POMs, and lanthanide connecting nodes, we have developed a "step-by-step" aggregation strategy, including the reaction of POMs with metal ions to bind metal nodes on the surfaces of POMs at the first step and the reaction of the resulting POM derivatives with metalloporphyrin linkers to result in hybrid materials at the second step. Catalytic experiments demonstrate that the resulting hybrid material exhibits interesting catalytic properties in the heterogeneous epoxidation of olefins, in which the conversion, epoxide selectivity, turnover number, and turnover frequency for the epoxidation of styrene to (1,2-epoxyethyl)benzene are >99%, 94%, 220000, and 22000 h(-1), respectively. These results demonstrate that the collaborative work of multiple active sites in hybrid materials can achieve superior high efficiency in heterogeneous catalysis.
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 06-2022
DOI: 10.1016/J.WASMAN.2022.04.039
Abstract: In the phosphorous-sulphur two-step process for the clean production of phosphoric acid, a phosphate-rock acid-insoluble residue (PAIR) is a solid filter residue obtained via the phosphoric acid acidolysis of phosphate rock (PR). PAIR combined with other raw materials can be used to prepare cement, ceramics and glasses, opening a potential avenue for large-scale PAIR utilisation. However, the preparation of such materials requires high-temperatures calcination. Understanding the high-temperature thermal properties of PAIR can enable its more targeted comprehensive utilisation or disposal. In this study, the thermal properties and pyrolysis kinetics of PAIR were systematically studied using a multiple heating rate method based on thermogravimetric analysis and a kinetic model. Results showed that from room temperature to 1200 °C, the main changes in the PAIR were the complete removal of fluorine and sulphur, partial removal of phosphorus and conversion of quartz to cristobalite. Moreover, during these processes, H
Publisher: Thomas Telford Ltd.
Date: 08-2021
Abstract: Different liquid accelerators including sodium aluminate liquid accelerator (SAa), fluoaluminate liquid accelerator (Fa) and aluminium sulfate liquid accelerator (ASa) were selected to investigate their influences on the carbonation properties and morphology of tricalcium aluminate (C 3 A) and tricalcium silicate (C 3 S) hydration products. After an accelerated carbonation test, the relative contents of ettringite (AFt), calcium hydroxide (CH) and calcium carbonate (CaCO 3 ) in the hydration products of C 3 A and C 3 S s les were analysed by thermogravimetric analysis. The results indicated that the hydration products of C 3 A and C 3 S with liquid accelerators were easier to carbonate, and the promotion effect of SAa was the most obvious. The morphology of hydrated products of C 3 A and C 3 S was observed by scanning electron microscopy analysis. It was observed that different liquid accelerators had a different influence on the morphology of C 3 A and C 3 S hydration products. Among them, ASa had the greatest influence on the morphology of C 3 A and C 3 S hydration products, and experiments proved that ASa could promote the transformation of AFt into AFm and make the CH crystal structure become thicker and larger.
Publisher: Elsevier BV
Date: 2020
Publisher: MDPI AG
Date: 12-02-2020
DOI: 10.3390/MIN10020157
Abstract: Sodium thioglycolate is a chalcopyrite depressant, but its depressant effect is weak. The paper investigated the effect of CuSO4 on the depressant performance of sodium thioglycolate towards chalcopyrite through flotation tests, Zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analyses and Fourier-transform infrared (FTIR) spectra measurements. It was found that copper ions could improve the depressant effect of sodium thioglycolate on chalcopyrite. The results showed that copper ions could adsorb on the surface of chalcopyrite and form mixed copper sulfide and cupric oxides/hydroxides adsorption layers. As a result, the mineral composition on the chalcopyrite surface was changed. With sodium thioglycolate treatment, the Zeta potential and the adsorption sites of chalcopyrite surface were both increased, and the hydrophobic substance Sn2−/S0 concentration was decreased. The electrostatic repulsion of chalcopyrite surface with sodium thioglycolate was also decreased, which made the sodium thioglycolate interact with chalcopyrite more easily. The more active sites could adsorb more sodium thioglycolate, which improved the hydrophilia of chalcopyrite. At the same time, the decrease of Sn2−/S0 concentration could further improve the hydrophilia of chalcopyrite. The results show that the copper ions could exhibit auxiliary effect with sodium thioglycolate and could further enhance the depressant effect of sodium thioglycolate on the chalcopyrite flotation. This paper provides new insights into the depression of chalcopyrite flotation by sodium thioglycolate.
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 04-2022
Publisher: Trans Tech Publications, Ltd.
Date: 2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.507.222
Abstract: In this thesis, proper amount of whiskers were added to building gypsum used as the basic materials. The gypsum board properties, such as densities and flexural strength etc., were influenced by various whisker content. The results showed that the flexural performance of gypsum board could be enhanced when adding calcium sulfate whisker from a range of 0.5~3 wt.%. The flexural strength reached 5.38 MPa when calcium sulfate whisker content was 1 wt.%. The flexural strength could be higher than that of gypsum board without calcium sulfate whisker by 37.6%.
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier BV
Date: 10-2019
Publisher: Wiley
Date: 28-11-2018
Abstract: Even though numerous bioinspired catalysts have been developed, there remain huge gaps between the artificial and natural catalysts, because it is very difficult to imitate simultaneously the complicated constituents, structures, and synergistic effect of enzymes. We report herein a versatile metalloporphyrinic framework platform, which exhibits high efficiency in bioinspired catalysis, photocatalysis, and asymmetric catalysis. The catalytic properties are highly dependent on the tunable constituents and their cooperation, and are significantly superior to the corresponding molecular catalyst systems which lack the synergistic effects. Since there are numerous functional moieties that can readily be incorporated into the metalloporphyrinic framework platform, a myriad of applications can be simply realized by embedding different functional moieties.
Publisher: Informa UK Limited
Date: 23-06-2022
DOI: 10.1080/09593330.2020.1779354
Abstract: Through the flotation test of pure molybdenite and analyses of surface tension, XPS spectrum, zeta potential and contact angle, the influence of magnetized water on the flotation efficiency of pure molybdenite and its mechanism was investigated. The results showed that the recovery of coarse fraction was much higher than that of fine fraction, the magnetized water could significantly decrease the optimum dosages of collector and frother, simultaneously improve the recovery of molybdenite flotation, and the increase of fine fraction was obviously more than that of coarse fraction. The magnetization had little effect on the surface tension and dissolved oxygen of water, but obviously decreased the conductivity of water and pulp, which was beneficial to restrain molybdenite edge oxidation in water. The XPS test showed that the oxidation degree of molybdenite in magnetized water was obviously lower than that in unmagnetized water, which illustrated that the magnetized water could keep the natural floatability of molybdenite. The absolute value of the zeta potential and the contact angle of the molybdenite were increased after the treatment of magnetized water, which further verified that the magnetized water could help to inhibit molybdenite edge oxidation in water and improve the flotation efficiency of molybdenite.
Publisher: MDPI AG
Date: 19-12-2021
Abstract: The effects of different inorganic salt accelerators (CaBr2, NaBr, Ca(NO3)2, NaNO3) and an alkali-free liquid accelerator were researched at a low temperature of 10 °C. The results showed the effects of 1.5% NaBr and 1.5% NaNO3 inorganic accelerator were pronounced. The 1-d compressive strengths of the mortar with these two inorganic salts were increased by 185.8% and 184.2%, respectively, and the final setting times were shortened from 7.74 to 6.08 min and 6.12 min, respectively. The hydration temperatures at 10 °C were measured, and the promotion effects of the inorganic accelerators were calculated: the relationship between the hydration degree was αAS + NN αAS + NB αAS + CB αAS + CN αAS. In addition, the reaction of C3A with NaBr and NaNO3 was used to analyze the products in an ettringite phase, i.e., Ca4Al2O6Br210·H2O, 3CaOAl2O3Ca(NO3)2X·H2O. The formation of these phases was detected in the hydration products of the cement paste hydration for 12 h, 24 h, and 28 d. Combined with the mass loss of the ettringite phase at 90–120 °C, determined using TG/DTG, the synergetic acceleration mechanism of the inorganic accelerators was comprehensively inferred.
Publisher: Thomas Telford Ltd.
Date: 10-2011
DOI: 10.1680/ADCR.2011.23.5.249
Abstract: The influence of sodium gluconate (SG) on the adsorption of polynaphthalene sulfonate (PNS) superplasticiser on the surface of particles was investigated using cement and fly ash pastes. Below the saturated PNS dosage, SG reduces the fluidity loss of the two pastes and the amount of PNS adsorbed on the particle surface. The similarity of this behaviour for the two pastes indicates that inhibition of cement hydration is not the sole reason for SG reduction of fluidity loss of cement paste with PNS. X-ray photoelectron spectroscopy data show competing adsorption forces between SG and polar groups of PNS on the active points of the cement particle surface. This reduces the transformation rate from a caudal style to either a ring or horizontal PNS adsorptive style, as confirmed by dynamic adsorptive models. These are important mechanisms of SG reduction in the fluidity loss of cement pastes with PNS.
Publisher: Thomas Telford Ltd.
Date: 10-2022
Abstract: The objective of this study was to explore the influence of an alkali liquid accelerator based on sodium aluminate (ASa) on the early hydration behaviour of cement paste, tricalcium aluminate (C 3 A) and tricalcium silicate (C 3 S) and identify its accelerating mechanism. The setting times and mechanical properties of cement paste and mortar mixed with different amounts of ASa were determined. Isothermal calorimetry showed that the addition of ASa increased the first exothermic peak of cement hydration and advanced the second exothermic peak. The morphology of hydration products was analysed by scanning electron microscopy (SEM) and a model for the early hydration of cement paste was established. X-ray diffraction and SEM were also used to analyse the phase composition and morphology changes of C 3 A and C 3 S with or without ASa and early hydration models were established. Analysis of the experimental results revealed that the sodium hydroxide produced by ASa hydrolysis had the function of consuming gypsum, breaking calcium silicate hydrate gel film and increasing the calcium hydroxide concentration in the cement paste. The ettringite in the hydration products interweaved together to form a skeleton structure, which was conducive to cement paste hardening.
Publisher: Springer Science and Business Media LLC
Date: 17-09-2022
DOI: 10.1007/S11356-021-16436-3
Abstract: High-fluorine alkali-free liquid accelerator (AF
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 2012
Publisher: Elsevier BV
Date: 12-2022
Publisher: IEEE
Date: 1997
Publisher: ScienceOpen
Date: 28-07-2022
DOI: 10.14293/S2199-1006.1.SOR-.PP07KZA.V1
Abstract: The mining sector generates a substantial quantity of stone waste and tailings, which constitutes an environmental risk. The most prevalent method for disposing of this industrial waste is dumping, which contributes to soil deterioration and water contamination while acquiring precious land. It can be recycled using a number of processes, such as the promising geopolymerization technique, which transforms waste into value. This study reviews current developments in the manufacturing of mine tailings-based geopolymer composites from industrial waste as a possible sustainable building material. This paper also gives in-depth studies on the characteristics and behaviors of mine tailings composites used in geopolymer manufacturing, including physical and mechanical properties. This review also identifies knowledge gaps that must be filled in order to advance mine tailings composites for geopolymers.
Publisher: Elsevier BV
Date: 06-2022
Publisher: MDPI AG
Date: 17-05-2021
DOI: 10.3390/MIN11050528
Abstract: In this study, two auxiliary collectors (methyl naphthalene and naphthalene) of molybdenite and the traditional collector (kerosene) were mixed for molybdenite flotation, respectively. According to the selection and analysis of the auxiliary collector, it was found that the surface energy (γC= 44.50 mJ/m2) of the polycyclic aromatic hydrocarbons is very close to that (γS= 42.55 mJ/m2) of the molybdenite {100} surface. Therefore, it can be physically adsorbed onto the molybdenite {100} surface according to the principle of similar compatibility. Batch flotation was conducted on actual ore with the mixed collector, compared with kerosene alone. Batch flotation results showed that the mixed collector at a mass ratio of 95:5 of main collector to auxiliary collector at pH 11.0 improved molybdenite flotation, that is, the Mo recovery was increased by 3–4%. The practical application feasibility of the auxiliary collector was analyzed by the filtration speed of the flotation concentrate and the crystal resolution characteristics of the auxiliary collector. The results show that solid naphthalene (Nap) is easy to crystallize at low temperature and adhere to the surface of the flotation concentrate, resulting in a decrease of filtration velocity, while liquid methylnaphthalene (MNap) does not crystallize at low temperature. These results imply that the mixed collector Kerosene/MNap can generate a superior synergistic effect and achieve better collecting capacity than kerosene alone, resulting in the increase of flotation recovery by 3–4 percentage points. Moreover, the addition of MNap has little negative impact on the subsequent treatment of the product.
Publisher: Springer Science and Business Media LLC
Date: 27-07-2017
Publisher: Trans Tech Publications, Ltd.
Date: 10-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.204-208.4002
Abstract: The deterioration of concrete durability seriously affects utilization and lifespan of concrete constructions. This paper presented a novel method to improve concrete durability by synthesizing Super-absorbent Resins (SAR) in micro-cracks or capillary-pores of concrete, i.e., the synthesized SAR swell after absorbing water, fill micro-cracks or capillary-pores and prevent water penetration into concrete. The main performance of impermeability, freeze resistance and sulfate resistance related to concrete durability were studied. The results show that the impermeability, freeze resistance and sulfate corrosion resistance of cement mortar handled by SAR are obviously better than cement mortar unhandled by SAR.
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 10-2011
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 04-2016
Publisher: Thomas Telford Ltd.
Date: 08-2012
Abstract: The workability of a superplasticised cement paste can be improved by a higher fluidity and a lower flow loss. The effects of two retarders, sodium gluconate (SG) and citric acid (CA), on the workability of pastes containing 0·7 wt% β-naphthalenesulfonic acid-based superplasticiser (BNS) were determined. At the same BNS dosage, improved workability only occurred with the addition of 0·03–0·09 wt% SG, and not with 0·12–0·15 wt% SG or with 0·03–0·15 wt% CA. The reasons for this phenomenon were investigated by way of the adsorbed amount of BNS on C 3 S, C 2 S, C 4 AF-gypsum, and C 3 A-gypsum surfaces at different SG or CA dosages using ultraviolet spectrophotometry. SG and CA were found to reduce the adsorbed amounts of BNS on C 3 S, C 2 S, and C 4 AF-gypsum surfaces at 5 and 60 min because of the competitive adsorption between the retarders and BNS. CA also had a more remarkable reducing effect than SG. On the other hand, the adsorbed amount of BNS on C 3 A-gypsum was enhanced because the retarders accelerated the formation rate of ettringite. The adsorbed BNS amount was also higher in the presence of CA than that of SG, indicating that CA enhances the consumption of BNS in the structure of ettringite. Overall, 0·03–0·09 wt% SG distributes BNS better on different minerals and improves paste workability.
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 2021
Publisher: Springer Science and Business Media LLC
Date: 03-09-2021
DOI: 10.1007/S11356-021-16267-2
Abstract: The phosphorus-sulfur two-step production process was developed in the wet-process phosphoric acid industry to solve phosphogypsum pollution. However, phosphate rock acid-insoluble residue is produced during this process as a new type of solid waste, which had a high potential for recycling. For process reasons, this type of residue still contains a certain amount of fluorine and phosphorus, which has a massive impact on the potential uses of phosphate rock acid-insoluble residue. Therefore, X-ray photoelectron spectroscopy, Raman, electron probe spectroscopy, and scanning electron microscopy were used to examine the existing form and distribution of fluorine and phosphorus in phosphate rock acid-insoluble residue. The mass fraction of F and P
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 02-2017
DOI: 10.20964/2017.05.100
Publisher: MDPI AG
Date: 04-10-2019
DOI: 10.3390/MIN9100609
Abstract: Nonpolar hydrocarbon oil (NHO) is one of the most extensively used collectors in the flotation of molybdenite due to its excellent selectivity. However, NHO has low sensibility at pulp temperature. At low temperatures ( K), although more kerosene is used, the recovery of molybdenite flotation is still lower than at room temperature. In this study, magnetizing treatment, which is an efficient, low-cost, innovative, and environmentally friendly emulsification method, was used to improve the flotation performance of NHO in low-temperature molybdenite flotation. The test results showed that, compared with unmagnetized kerosene (UMK), the optimum dosage of magnetized kerosene (MK) could be reduced by 11% at 298 K. At the same dosage of kerosene, the flotation recovery of MK was 3% higher than UMK at 278 K. The surface tension measurement results showed that the surface tension of MK rose periodically as the magnetic field intensity increased, and there was a maximum surface tension within each period. Further, the magnetic field intensity had the maximum flotation recovery of molybdenite at the maximum surface tension of MK. Combined with the analysis based on the Girifalco–Good theory and the static drop volume method of interfacial tension, the interfacial tension of kerosene–water was shown to decrease with the increase of the surface tension of kerosene. This finding indicates that the dispersibility of kerosene in pulp could be improved by reducing the size of oil droplets, thereby improving the molybdenite flotation recovery of kerosene at low-temperature pulp. It is helpful to improve the flotation recovery of molybdenite using NHO as a collector for low-temperature pulp ( K).
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 09-2022
Publisher: MDPI AG
Date: 30-03-2020
DOI: 10.3390/MOLECULES25071585
Abstract: Room temperature sodium-sulfur batteries have been considered to be potential candidates for future energy storage devices because of their low cost, abundance, and high performance. The sluggish sulfur reaction and the “shuttle effect” are among the main problems that hinder the commercial utilization of room temperature sodium-sulfur batteries. In this study, the performance of a hybrid that was based on nitrogen (N)-doped carbon nanospheres loaded with a meagre amount of Fe ions (0.14 at.%) was investigated in the sodium-sulfur battery. The Fe ions accelerated the conversion of polysulfides and provided a stronger interaction with soluble polysulfides. The Fe-carbon nanospheres hybrid delivered a reversible capacity of 359 mAh·g−1 at a current density of 0.1 A·g−1 and retained a capacity of 180 mAh·g−1 at 1 A·g−1, after 200 cycles. These results, combined with the excellent rate performance, suggest that Fe ions, even at low loading, are able to improve the electrocatalytic effect of carbon nanostructures significantly. In addition to Na-S batteries, the new hybrid is anticipated to be a strong candidate for other energy storage and conversion applications such as other metal-sulfur batteries and metal-air batteries.
Publisher: Elsevier BV
Date: 03-2022
Publisher: IEEE
Date: 1997
Publisher: MDPI AG
Date: 17-06-2017
DOI: 10.3390/MIN7060104
Publisher: Springer Science and Business Media LLC
Date: 04-04-2023
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 04-2007
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 05-2021
Publisher: MDPI AG
Date: 08-08-2020
DOI: 10.3390/MA13163500
Abstract: Pre-stressed high-strength concrete piles (PHCP) are widely used in the building industry in China. The main aim of our research was to investigate the utilization of quartz powder, fly ash, and blast furnace slag as mineral additives to prepare PHCP mortar. The s les were prepared using steam and autoclaving steaming. The influence of minerals on the sulfate resistance of mortar was analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) tests. The results showed that when compared to single doped quartz powder s les, s les prepared using fly ash or blast furnace slag improved the sulfate resistance of the PHCP mortar. Furthermore, the resistance to sulfate attack of s les with dual doped quartz powder, fly ash, and blast furnace slag also improved. MIP tests showed that mineral additives can change the pore size distribution after autoclave curing. However, the number of aching holes increased after mixing with 20% quartz powder and caused a decrease in the sulfate resistance.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-08-2022
DOI: 10.36227/TECHRXIV.20402580.V1
Abstract: The mining sector generates a substantial quantity of stone waste and tailings, which constitutes an environmental risk. The most prevalent method for disposing of this industrial waste is dumping, which contributes to soil deterioration and water contamination while acquiring precious land. It can be recycled using a number of processes, such as the promising geopolymerization technique, which transforms waste into value. This study reviews current developments in the manufacturing of mine tailings-based geopolymer composites from industrial waste as a possible sustainable building material. This paper also gives in-depth studies on the characteristics and behaviors of mine tailings composites used in geopolymer manufacturing, including physical and mechanical properties. This review also identifies knowledge gaps that must be filled in order to advance mine tailings composites for geopolymers.
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 06-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7DT00267J
Abstract: The performance of a dye-sensitized solar cell (DSSC) is strongly influenced by the catalytic performance of its counter electrode (CE) materials.
Publisher: Elsevier BV
Date: 05-2023
Publisher: Trans Tech Publications, Ltd.
Date: 10-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.374-377.1872
Abstract: Carbonation is one of the key factors that result in the corrosion of the reinforcing steel embedded in concrete. In this work, a novel method to improve the resistance to carbonation of concrete was presented, i.e. the surface of the concrete specimens were treated by Super-absorbent resin (SAR) synthesized in situ, the prepolymer solution of poly (acrylic acid-co-acrylamide) with initiator and crosslinker was impregnated in the capillary-pores of concrete, then the acrylic acid and acrylamide copolymer by self-crosslingking under the initiator to synthesize SAR of poly (acrylic acid-co-acrylamide). The backbone of SAR is characterized by FTIR spectrum the resistance to carbonation of the concrete with and without treatment by SAR was studied and the carbonation depth of concrete after the accelerated carbonation testing was measured. The results show that the concrete specimens treated with SAR have higher resistance to carbonation than that of the blank concrete specimens due to the synthesized SAR being swollen after absorbing water, filling the capillary-pores of concrete and reducing the ingress of CO2 and H2O.
Publisher: Wiley
Date: 06-03-2020
Publisher: Trans Tech Publications, Ltd.
Date: 05-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.174-177.579
Abstract: Fixed the composition of matrix slurry in low cement castable, added different additives such as STPP, KS-JS70, GLENIUX, Rheoplus, LMS-P, determined the slurry viscosity by using the NXS-11A rotary viscometer, analysised the rheological properties of the different matrix paste.Studies have shown that: there is a certain influence on the slurry rheology for different species and dosage, and there is the appropriate dosage. Analyzed the mechanisms of different admixtures on the rheological properties of slurry on theoretical.
Publisher: Elsevier BV
Date: 11-2019
Publisher: MDPI AG
Date: 02-02-2023
DOI: 10.3390/BUILDINGS13020421
Abstract: In this paper, initial experiments were carried out to determine the possibility of using chicken feathers instead of sand in mortar. After earlier research suggested that chicken feathers had a high durability and resilience to degradation, chicken feathers recovered from slaughterhouses were chosen due to the significant cross-linking and strong bonding within their structure. Compared to natural sand, chicken feather sand (CFS) works as an eco-friendly resource. In this study, the chicken feather content ranged from 5% to 25% of the total volume of fine aggregates. The findings confirmed that the compressive strengths of the specimens are inversely proportional to the amount of feathers added. The specimen with 10% CFS had a compressive strength of 57.8 MPa after 28 days of curing. As the weight of CFS in the mortar increased from 1.26% to 10% of the control mixture, the workability significantly decreased. After soaking in water for 24 h, materials with higher proportions of feathers had a noticeably decreased compressive and flexural strength as well as increased water absorption and swelling. For 80% of the CFS replacement, the results are good. Additional CFS replacement tends to reduce the mortar weight.
Publisher: Elsevier BV
Date: 2023
Location: Hong Kong
No related grants have been discovered for Xiang He.