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134 results on '"Fang, Wangxi"'

10. A Chiral COFs Membrane for Enantioselective Amino Acid Separation.

Author

Manoranjan, Narmadha, Fang, Wangxi, Zhu, Yuzhang, and Jin, Jian

Abstract

Incorporating chiral molecules in the covalent organic frameworks (COFs) with uniformly ordered pores results in chiral COFs, which have been highly promising candidates for enantioseparation. Herein, a homochiral COF nanochannel membrane is reported by introducing chiral centers (L‐phenylalanine methyl ester) into one of the organic ligands for the enantioseparation of chiral amino acids. The separation results show that the D‐isomer is preferentially transported through the porous membrane channel. This composite membrane exhibits excellent selectivity for racemic phenylalanine with the highest enantiomeric excess value of up to 99.4 %. The adsorption and molecular modeling studies substantiate the experiment results by showing higher bonding affinity towards D‐isomer over L‐isomer. The excellent enantioselective gating performance unveils the porous COF skeleton with chiral selectors and the size‐matching synergy for stereoselective interactions with chiral isomers. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Zero‐Oil‐Fouling Membrane With High Coverage of Grafted Zwitterionic Polymer for Separation of Oil‐in‐Water Emulsions.

Author

Wang, Aqiang, Zhu, Yuzhang, Fang, Wangxi, Gao, Shoujian, and Jin, Jian

Subjects
POLYZWITTERIONS, POLYMER fractionation, POLYMERIC membranes, DIFLUOROETHYLENE, EMULSIONS, POLYVINYLIDENE fluoride, POLYMERS
Abstract

Current hydrophilic modification strategies improve the antifouling ability of membranes but fail to completely eliminate the fouling of emulsified oil droplets with a wide size distribution. Constructing membranes with superior anti‐oil‐fouling ability to resist various oil droplets especially at high permeation fluxes is challenging. Here, the fabrication of a zero‐oil‐fouling membrane by grafting considerably high coverage of zwitterionic polymer and building defect‐free hydration defense barrier on the surface is reported. A uniform layer of protocatechuic acid with COOH as abundant as existing in every molecule is stably deposited on the membrane so as to provide sufficient reactive sites and achieve dense grafting of the zwitterionic polymer. The coverage of zwitterionic polymer on the membrane plays a crucial role in promoting the antifouling ability to emulsified oil droplets. The poly(vinylidene fluoride) membrane with 93% coverage of the zwitterionic polymer exhibits zero oil fouling when separating multitudinous oil‐in‐water emulsions with ≈0% flux decline, ≈100% flux recovery, and a high water flux of ≈800 L m−2 h−1 bar−1. This membrane outperforms almost all of the reported membranes in terms of the comprehensive antifouling performance. This work provides a feasible route for manufacturing super‐antifouling membranes toward oil/water separation application. [ABSTRACT FROM AUTHOR]

Published
2024
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