The Experts below are selected from a list of 126 Experts worldwide ranked by ideXlab platform
Ling Zan - One of the best experts on this subject based on the ideXlab platform.
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band gap energy adjustable and noble metal free modified nis znxcd1 xs for highly efficient visible light driven cr6 photoreduction in Alkaline Wastewater
Journal of Physics and Chemistry of Solids, 2021Co-Authors: Linjuan Wang, Ling ZanAbstract:Abstract Industrial Wastewater containing heavy metal ions can cover the full pH range according to the manufacturing process. Alkaline Wastewater treatment is still a great challenge because Cr6+ therein has a more negative reduction potential (Cr2O72− + 14H+ + 6e− = 2Cr3+ + 7H2O (ECr6+(Cr2O72−/Cr3+) = E θ − RT nF ln [ OH ] − ) than in acid solution, in which it can be easily reduced by numerous reagents. In this study, weakly Alkaline Cr6+ solution has been used to simulate weakly Alkaline industrial Wastewater, and a reagent capable of excellent reduction efficiency therein has been developed. A series of band-gap-energy-adjustable NiS-ZnxCd1-xS composites has been synthesized by a one-pot hydrothermal method. A more negative conduction band position for ZnxCd1-xS has been achieved by doping and changing the amount of Zn2+ ions to ensure a superior photoreduction ability. All modified samples show excellent photocatalytic efficiency. For example, the reduction efficiency of 10%NiS–Zn0.25Cd0.75S sample is threefold higher than that of Zn0.25Cd0.75S and sixfold higher than that of CdS when deployed at a catalytic level for 30 min. Multiple characterization methods have been applied, and the results show that the improved efficiency can be ascribed to intimate contact between Zn0.25Cd0.75S and NiS. Photoluminescence (PL) and photocurrent measurements and electrochemical impedance spectroscopy (EIS) further elucidate the catalytic mechanism and imply an enhanced charge-carrier separation efficiency between Zn0.25Cd0.75S and NiS.
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noble metal free mos 2 modified in 2 s 3 for excellent visible nir light driven photocatalytic of cr 6 removal in Alkaline Wastewater
Journal of Nanoparticle Research, 2020Co-Authors: Linjuan Wang, Ling ZanAbstract:MoS2-modified In2S3 (x wt.%MoS2-In2S3) samples (0 ≤ x ≤ 20) were fabricated through a facile one-pot hydrothermal process. All In2S3 samples modified by MoS2 deliver an excellent Cr6+ removal ability under visible-NIR-light-driven, and 5% MoS2-In2S3 can reduce 20 mg/L Cr6+ solution completely within 30 min with a trace photocatalyst concentration (0.27 mg/mL) which is 3.2-hold higher than that of single In2S3. Further investigations demonstrate that the loaded MoS2 can not only enhance the absorption of light scope but also promote the interfacial electron transfer from In2S3 to MoS2 and then to Cr6+, thus greatly improving the Cr6+ removal ability. ESR shows that the modifying of MoS2 can accelerate the transformation of electrons from the In2S3 to MoS2 which results in that the intensity of O2−• significantly increased. PL, photocurrent, and EIS further identified that the modification of MoS2 can greatly improve the charge carrier separation efficiency. The fabricated MoS2-In2S3 samples also exhibit characteristic features such as stable and reducing Cr6+ in the weak Alkaline environment for the first time, which could always be a great challenge for Wastewater purification in Alkaline condition.
Linjuan Wang - One of the best experts on this subject based on the ideXlab platform.
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band gap energy adjustable and noble metal free modified nis znxcd1 xs for highly efficient visible light driven cr6 photoreduction in Alkaline Wastewater
Journal of Physics and Chemistry of Solids, 2021Co-Authors: Linjuan Wang, Ling ZanAbstract:Abstract Industrial Wastewater containing heavy metal ions can cover the full pH range according to the manufacturing process. Alkaline Wastewater treatment is still a great challenge because Cr6+ therein has a more negative reduction potential (Cr2O72− + 14H+ + 6e− = 2Cr3+ + 7H2O (ECr6+(Cr2O72−/Cr3+) = E θ − RT nF ln [ OH ] − ) than in acid solution, in which it can be easily reduced by numerous reagents. In this study, weakly Alkaline Cr6+ solution has been used to simulate weakly Alkaline industrial Wastewater, and a reagent capable of excellent reduction efficiency therein has been developed. A series of band-gap-energy-adjustable NiS-ZnxCd1-xS composites has been synthesized by a one-pot hydrothermal method. A more negative conduction band position for ZnxCd1-xS has been achieved by doping and changing the amount of Zn2+ ions to ensure a superior photoreduction ability. All modified samples show excellent photocatalytic efficiency. For example, the reduction efficiency of 10%NiS–Zn0.25Cd0.75S sample is threefold higher than that of Zn0.25Cd0.75S and sixfold higher than that of CdS when deployed at a catalytic level for 30 min. Multiple characterization methods have been applied, and the results show that the improved efficiency can be ascribed to intimate contact between Zn0.25Cd0.75S and NiS. Photoluminescence (PL) and photocurrent measurements and electrochemical impedance spectroscopy (EIS) further elucidate the catalytic mechanism and imply an enhanced charge-carrier separation efficiency between Zn0.25Cd0.75S and NiS.
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noble metal free mos 2 modified in 2 s 3 for excellent visible nir light driven photocatalytic of cr 6 removal in Alkaline Wastewater
Journal of Nanoparticle Research, 2020Co-Authors: Linjuan Wang, Ling ZanAbstract:MoS2-modified In2S3 (x wt.%MoS2-In2S3) samples (0 ≤ x ≤ 20) were fabricated through a facile one-pot hydrothermal process. All In2S3 samples modified by MoS2 deliver an excellent Cr6+ removal ability under visible-NIR-light-driven, and 5% MoS2-In2S3 can reduce 20 mg/L Cr6+ solution completely within 30 min with a trace photocatalyst concentration (0.27 mg/mL) which is 3.2-hold higher than that of single In2S3. Further investigations demonstrate that the loaded MoS2 can not only enhance the absorption of light scope but also promote the interfacial electron transfer from In2S3 to MoS2 and then to Cr6+, thus greatly improving the Cr6+ removal ability. ESR shows that the modifying of MoS2 can accelerate the transformation of electrons from the In2S3 to MoS2 which results in that the intensity of O2−• significantly increased. PL, photocurrent, and EIS further identified that the modification of MoS2 can greatly improve the charge carrier separation efficiency. The fabricated MoS2-In2S3 samples also exhibit characteristic features such as stable and reducing Cr6+ in the weak Alkaline environment for the first time, which could always be a great challenge for Wastewater purification in Alkaline condition.
Huizhou Liu - One of the best experts on this subject based on the ideXlab platform.
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kinetics controlled separation intensification for cesium and rubidium isolation from salt lake brine
Industrial & Engineering Chemistry Research, 2018Co-Authors: Jianfeng Zhang, Liangrong Yang, Tingting Dong, Feng Pan, Huifang Xing, Huizhou LiuAbstract:The separation efficiency of cesium (Cs(I)) and rubidium (Rb(I)) from a synthetic brine solution containing potassium (K(I)) was improved via a kinetics-controlled strategy. Specifically, 4-tert-butyl-2-(α-methylbenzyl) phenol (t-BAMBP) dodecane solution was partially saponified by NaOH solution first and then was directly used in extraction without adjusting the pH of the feed solution to exceed 13. Compared to the traditional process, much higher separation factors of Cs(I) and Rb(I) over K(I) (βCs/K = 1550.7, βRb/K = 45.2) were gained due to the enhanced kinetics differences during ion exchanges. In addition, the consumption of NaOH was reduced by 70–97%, and a large amount of strong Alkaline Wastewater was avoided because of the recyclability of NaOH saponifying agent. For synthetic brine solution containing high concentration K(I), 99.1% Cs(I) and 86.5% Rb(I) were recovered after three-stage extraction. The novel process showed a bright prospect for the extraction of Cs(I) and Rb(I).
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Kinetics-Controlled Separation Intensification for Cesium and Rubidium Isolation from Salt Lake Brine
2018Co-Authors: Jianfeng Zhang, Liangrong Yang, Tingting Dong, Feng Pan, Huifang Xing, Huizhou LiuAbstract:The separation efficiency of cesium (Cs(I)) and rubidium (Rb(I)) from a synthetic brine solution containing potassium (K(I)) was improved via a kinetics-controlled strategy. Specifically, 4-tert-butyl-2-(α-methylbenzyl) phenol (t-BAMBP) dodecane solution was partially saponified by NaOH solution first and then was directly used in extraction without adjusting the pH of the feed solution to exceed 13. Compared to the traditional process, much higher separation factors of Cs(I) and Rb(I) over K(I) (βCs/K = 1550.7, βRb/K = 45.2) were gained due to the enhanced kinetics differences during ion exchanges. In addition, the consumption of NaOH was reduced by 70–97%, and a large amount of strong Alkaline Wastewater was avoided because of the recyclability of NaOH saponifying agent. For synthetic brine solution containing high concentration K(I), 99.1% Cs(I) and 86.5% Rb(I) were recovered after three-stage extraction. The novel process showed a bright prospect for the extraction of Cs(I) and Rb(I)
Glenys Lugg - One of the best experts on this subject based on the ideXlab platform.
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Permeable reactive barrier rejuvenation by Alkaline Wastewater
Environmental geotechnics, 2015Co-Authors: Glenys Lugg, Laura Banasiak, Udeshini Pathirage, Geoff Mcintosh, Buddhima Indraratna, Neil RendellAbstract:Chemical armouring of recycled concrete in a permeable reactive barrier (PRB) used for the neutralisation of acidic groundwater in acid sulfate soil terrain significantly decreases its acid neutralising capacity (ANC) by approximately 50% compared with its theoretical ANC. A long-term column test was conducted under simulated field groundwater conditions to assess the re-conditioning of armoured recycled concrete aggregates with Alkaline Wastewater, with the aim to restore and enhance the ANC and longevity of the PRB. The benefits of Alkaline Wastewater injection included sharp but short enhancement of the recycled concretes’ ANC, as indicated by an increase in effluent pH (pH 3 to 7·7) and alkalinity (0 to 21·6 mM CaCO3) and a reduction in oxidation reduction potential (ORP, 530 to 160–200 mV). While the results showed that the Alkaline Wastewater did not significantly reduce chemical armouring, it aided in the liberation of lodged mineral precipitates between concrete aggregates, reducing the severity o...
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numerical modeling of clogging in a permeable reactive barrier and rejuvenation by Alkaline fluid injection in the shoalhaven floodplain australia
Ground Improvement Case Histories#R##N#Chemical Electrokinetic Thermal and Bioengineering, 2015Co-Authors: Udeshini Pathirage, Laura Banasiak, Buddhima Indraratna, Glenys LuggAbstract:Abstract A permeable reactive barrier (PRB) was utilized to remediate the acidic water generated from acid sulfate soil (ASS) in the Shoalhaven Floodplain approximately 100 km south of Sydney, Australia, where acidic groundwater is a severe environmental, social, and economic problem. After testing more than 20 Alkaline materials, recycled concrete aggregates were chosen as a capable alkalinity source and utilized in this PRB. The current study aims to simulate the performance of the PRB by coupling geochemistry with geohydraulics. Secondary minerals precipitate during the remediation process, causing chemical clogging, which reduces the porosity and hydraulic conductivity of the reactive material. Laboratory column experiments were carried out to understand the remediation process taking place between acidic groundwater and recycled concrete particles. Commercially available finite different codes, MODFLOW and RT3D, were used to simulate the time-dependent modeling of the PRB. An original geochemical algorithm was developed capturing all the chemical reactions and fed into RT3D. The column experiments and field results are in good agreement with the model calculations, which proved that the reduction in hydraulic conductivity due to mineral precipitation occurs mostly at the entrance zone of the PRB and was insignificant in the middle and exit zones after 6 years of operation. A long-term column test was conducted to assess the reconditioning of armored recycled concrete with Alkaline Wastewater, with the aim to restore and enhance the acid neutralization capacity (ANC) and longevity of the PRB. Benefits of the Alkaline Wastewater injection included sharp but short enhancement of the concretes’ ANC, as indicated by an increase in effluent pH (pH 3–7.7) and alkalinity (0–21.6 mM CaCO 3 ), and a reduction in oxidation reduction potential (530–160 mV). Although results showed that the Alkaline Wastewater did not significantly reduce chemical armoring, it assisted in the release of mineral precipitates between the concrete aggregates, reducing the extent of chemical and physical clogging.
R C Pullar - One of the best experts on this subject based on the ideXlab platform.
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extremely fast and efficient methylene blue adsorption using eco friendly cork and paper waste based activated carbon adsorbents
Journal of Cleaner Production, 2018Co-Authors: Rui M Novais, Ana P F Caetano, M P Seabra, J A Labrincha, R C PullarAbstract:Abstract For the first time the feasibility of using an Alkaline Wastewater coming from the pulp and paper industry as an activator, partially (50 vol%) replacing commercial sodium hydroxide, in the production of cork-based activated carbons was evaluated. The activated carbons showed the highest value of specific surface area ever reported for cork-based activated carbons (1670 m2/g), surpassing several other commercial and waste-based ones. These eco-friendly cork and paper waste-based activated carbons were then evaluated as methylene blue adsorbent materials. The influence of contact time, methylene blue initial concentration and adsorbent amount on the methylene blue removal efficiency by the activated carbons was studied. Extremely fast (>99.9% removal in 5 min) and efficient methylene blue adsorption (uptake of 350 mg/g) by the cork and paper waste-based adsorbents was achieved, which demonstrates the huge potential of these innovative adsorbents. These activated carbons were produced using two unexplored industrial by-products (Alkaline Wastewater and cork) and, therefore, may be an inexpensive source of activated carbons, which can be used for the effective removal of dyes from Wastewaters. Furthermore, despite the very large surface area and high removal efficiency this is not a nano material (being around 30–50 μm in size), its capabilities being due to its unique cork-derived microstructure, and hence it can be handled and removed/filtered much more easily than nanocarbons, and without any associated health or environmental risks.