The Experts below are selected from a list of 1653 Experts worldwide ranked by ideXlab platform
Jindun Liu - One of the best experts on this subject based on the ideXlab platform.
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stably coating loose and electronegative thin layer on anion exchange membrane for efficient and selective monovalent anion transfer
Desalination, 2017Co-Authors: Haoqin Zhang, Rui Ding, Yujing Zhang, Benbing Shi, Jingtao Wang, Jindun LiuAbstract:Abstract Herein, a novel thin electronegative layer with loosely porous structure is fabricated through interfacial polymerization of benzene-rich monomer (2,5-diaminobenzenesulfonic acid (DSA) or 3,5-diaminobenzoic acid (DMA)) and cross-linker (trimesoyl chloride), using the blend of polyvinyl alcohol and quaternized-chitosan as base membrane. The base membrane achieves adequate fluxes for both monovalent and divalent anions but limits monovalent/divalent anions permselectivity to below 2.5. By comparison, the thin and porous surface layer endows the dual-layered membrane with only slight flux reduction of below 9.0% for monovalent anions, yet a 30.6% flux reduction for SO42 − based on Donnan-Effect and steric Effect. The Effective intercept of SO42 − on membrane surface weakens its competitive transfer with Cl−, thus the Cl−/SO42 − permselectivity is significantly elevated by 472.2% from 1.8 to 10.3, which is even 36.3% higher than that of commercial Neosepta ACS. Furthermore, the antifouling potential and thermal/mechanical stabilities of the dual-layered membrane are improved assisted by the hydrophilic and electronegative features of coated layer and its covalent bonds with base layer. DSA and DMA, two analogous monomers, are utilized and compared to verify the universality of this nanostructure, helping to explore the structure-performance relationship.
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zwitterionic functionalized layered double hydroxides nanosheets for a novel charged mosaic membrane with high salt permeability
Journal of Membrane Science, 2016Co-Authors: Jindun Liu, Jing Wang, Yatao Zhang, Junyong Zhu, Jingwei Hou, Bart Van Der BruggenAbstract:Abstract Charged mosaic membranes containing equivalent cationic and anionic exchange capacities are capable of decreasing the Donnan Effect and thus accelerating salts permeation, while maintaining a high rejection of low molecular weight organics. In this study, charged nanosheets zwitterion–hydrotalcite (ZHT) was synthesized by grafting sulfobetaine methacrylate (SBMA) on the surface of positively charged Mg/Al hydrotalcite via surface initiated reverse atom transfer radical polymerization (RATRP). Subsequently, charged mosaic membranes were prepared by embedding different amounts of zwitterion–hydrotalcite into polyethersulfone (PES) casting solution via non-solvent induced phase separation (NIPS). Fourier transforms infrared spectra (FT-IR) and transmission electron microscopy (TEM) indicates that the zwitterion–hydrotalcite was successfully synthesized and well exfoliated. X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), ionic exchange capacity (IEC), surface zeta potential measurement and water contact angle were employed to investigate the Effect of ZHT content on overall performance of prepared membranes. It was found that charged mosaic membranes manifested an enhanced ionic exchange capacity, surface hydrophilicity and hydraulic permeability compared to original membrane. Importantly, the charged mosaic membranes presented excellent dyes retention (86.7% for Reactive Red 49), superior salt permeation, and high water flux (80.2 L m −2 h −1 ) under 0.4 MPa. Furthermore, the retention of MgCl 2 , Na 2 SO 4 and NaCl was as low as 9.3%, 7.6% and 0.53%, respectively. It is worth noting that ultra-high salt permeation as a bright spot of charged mosaic membranes could be achieved, which was ascribed to the introduction of zwitterion–hydrotalcite. A mechanism of salt transport through charged mosaic membranes is proposed in this study. Overall, these promising results demonstrate the potential of charged mosaic membranes and suggest their comfortable use in dyes separation.
Shaomin Liu - One of the best experts on this subject based on the ideXlab platform.
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yxsi1 xo2 so3h self assembled membrane formed on phosphorylated yxsi1 xo2 al2o3 for oily seawater partial desalination and deep cleaning
Journal of Membrane Science, 2018Co-Authors: Yuqing Zhang, Song Wei, Ming Yong, Wei Liu, Shaomin LiuAbstract:Abstract In order to save energy consumption of reverse osmosis (RO) process via partial desalination and deep cleaning of oily seawater, YxSi1-xO2-SO3H (YSS) particles were synthesized through co-hydrolysis, silanization and sulfonation, then employed as a functional layer on phosphorylated YxSi1-xO2/Al2O3 (PYSA) to form YSS self-assembled membrane. YSS particles were characterized by SEM, FT-IR and XRD, while the membranes were analyzed through SEM. The YSS self-assembled membranes formed under the optimum conditions were used to partially desalinate and deeply clean oily seawater. The results indicate that YSS particles were successfully synthesized and particle size is homogeneously distributed between 3 and 5 µm. Furthermore, YSS self-assembled membranes not only perform attractive ultrafiltration properties, but also display a desirable partial desalination ratio of 28.6% through Donnan Effect under low operating pressure of 0.14 MPa, and contribute to an energy saving of 254.7 W (about 22.0%) for RO process. Besides, the self-assembled membranes can be recycled by calcination, and still partially desalinate and clean oily seawater. This work suggests that YSS self-assembled membranes with partial desalination property are promising alternatives for oily seawater treatment.
Yuqing Zhang - One of the best experts on this subject based on the ideXlab platform.
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yxsi1 xo2 so3h self assembled membrane formed on phosphorylated yxsi1 xo2 al2o3 for oily seawater partial desalination and deep cleaning
Journal of Membrane Science, 2018Co-Authors: Yuqing Zhang, Song Wei, Ming Yong, Wei Liu, Shaomin LiuAbstract:Abstract In order to save energy consumption of reverse osmosis (RO) process via partial desalination and deep cleaning of oily seawater, YxSi1-xO2-SO3H (YSS) particles were synthesized through co-hydrolysis, silanization and sulfonation, then employed as a functional layer on phosphorylated YxSi1-xO2/Al2O3 (PYSA) to form YSS self-assembled membrane. YSS particles were characterized by SEM, FT-IR and XRD, while the membranes were analyzed through SEM. The YSS self-assembled membranes formed under the optimum conditions were used to partially desalinate and deeply clean oily seawater. The results indicate that YSS particles were successfully synthesized and particle size is homogeneously distributed between 3 and 5 µm. Furthermore, YSS self-assembled membranes not only perform attractive ultrafiltration properties, but also display a desirable partial desalination ratio of 28.6% through Donnan Effect under low operating pressure of 0.14 MPa, and contribute to an energy saving of 254.7 W (about 22.0%) for RO process. Besides, the self-assembled membranes can be recycled by calcination, and still partially desalinate and clean oily seawater. This work suggests that YSS self-assembled membranes with partial desalination property are promising alternatives for oily seawater treatment.
T S Zhao - One of the best experts on this subject based on the ideXlab platform.
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a transient electrochemical model incorporating the Donnan Effect for all vanadium redox flow batteries
Journal of Power Sources, 2015Co-Authors: Yuan Lei, Baowen Zhang, Bofeng Bai, T S ZhaoAbstract:Abstract In a typical all-vanadium redox flow battery (VRFB), the ion exchange membrane is directly exposed in the bulk electrolyte. Consequently, the Donnan Effect occurs at the membrane/electrolyte (M/E) interfaces, which is critical for modeling of ion transport through the membrane and the prediction of cell performance. However, unrealistic assumptions in previous VRFB models, such as electroneutrality and discontinuities of ionic potential and ion concentrations at the M/E interfaces, lead to simulated results inconsistent with the theoretical analysis of ion adsorption in the membrane. To address this issue, this work proposes a continuous-Donnan Effect-model using the Poisson equation coupled with the Nernst–Planck equation to describe variable distributions at the M/E interfaces. A one-dimensional transient VRFB model incorporating the Donnan Effect is developed. It is demonstrated that the present model enables (i) a more realistic simulation of continuous distributions of ion concentrations and ionic potential throughout the membrane and (ii) a more comprehensive estimation for the Effect of the fixed charge concentration on species crossover across the membrane and cell performance.
Haoqin Zhang - One of the best experts on this subject based on the ideXlab platform.
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stably coating loose and electronegative thin layer on anion exchange membrane for efficient and selective monovalent anion transfer
Desalination, 2017Co-Authors: Haoqin Zhang, Rui Ding, Yujing Zhang, Benbing Shi, Jingtao Wang, Jindun LiuAbstract:Abstract Herein, a novel thin electronegative layer with loosely porous structure is fabricated through interfacial polymerization of benzene-rich monomer (2,5-diaminobenzenesulfonic acid (DSA) or 3,5-diaminobenzoic acid (DMA)) and cross-linker (trimesoyl chloride), using the blend of polyvinyl alcohol and quaternized-chitosan as base membrane. The base membrane achieves adequate fluxes for both monovalent and divalent anions but limits monovalent/divalent anions permselectivity to below 2.5. By comparison, the thin and porous surface layer endows the dual-layered membrane with only slight flux reduction of below 9.0% for monovalent anions, yet a 30.6% flux reduction for SO42 − based on Donnan-Effect and steric Effect. The Effective intercept of SO42 − on membrane surface weakens its competitive transfer with Cl−, thus the Cl−/SO42 − permselectivity is significantly elevated by 472.2% from 1.8 to 10.3, which is even 36.3% higher than that of commercial Neosepta ACS. Furthermore, the antifouling potential and thermal/mechanical stabilities of the dual-layered membrane are improved assisted by the hydrophilic and electronegative features of coated layer and its covalent bonds with base layer. DSA and DMA, two analogous monomers, are utilized and compared to verify the universality of this nanostructure, helping to explore the structure-performance relationship.