文献类型：期刊文献

英文题名：Superior nanofiltration membranes with gradient cross-linked selective layer fabricated via controlled hydrolysis

作者：Zhan, Zi-Ming[1];Xu, Zhen-Liang[1];Zhu, Ka-Ke[1];Xue, Shuang-Mei[1];Ji, Chen-Hao[1];Huang, Ben-Qing[1];Tang, Chuyang Y.[2];Tang, Yong-Jian[1]

机构：[1]East China Univ Sci & Technol, Chem Engn Res Ctr, State Key Lab Chem Engn, Membrane Sci & Engn R&D Lab, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Univ Hong Kong, Dept Civil Engn, Pokfulam, HW619B, Hong Kong, Peoples R China

年份：2020

卷号：604

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20201308363384);WOS:【SCI-EXPANDED(收录号:WOS:000545790200009)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant No: 21808060), the Fundamental Research Funds for the Central Universities (222201814009).

语种：英文

外文关键词：Nanofiltration; Membrane preparation; Hydrolysis; Polyamide; Permeability

摘要：Nanofiltration (NF) membranes with both high permeability and salt rejection are in dire need for water treatment. Generally, heat treatment is an essential step for fabricating polyamide NF membranes. Conventional heat treatment in an oven causes membrane pore shrinkage and over cross-linking, which often leads to a severe loss of permeation performance. Herein, we report a single-step method by heat-treating membranes in non-neutral solutions to avoid pore shrinkage and generate graded hydrolysis in membrane selective layer. As confirmed by the XPS result, the polyamide NF membrane fabricated via controlled hydrolysis possesses a gradient cross-linking degree vertically along the membrane surface. This optimal polyamide NF membrane had a superior pure water permeability (PWP) of 27.5 L m(-2) h(-1) bar(-1) and high Na2SO4 rejection of 98.5%. Such controlled hydrolysis approach provides novel strategy for fabricating high performance polyamide membranes.