文献类型：期刊文献

英文题名：Degradation of polyamide nanofiltration membranes by free chlorine and halide ions: Kinetics, mechanisms, and implications

作者：Yang, Linyan[1,2,3];Yu, Haixiang[4];Zhao, Huihui[1,2,3];Xia, Caiping[3];Yu, Qinyu[3];Chen, Xueming[5];Cao, Guomin[3];Cai, Lankun[3];Meng, Shujuan[6];Tang, Chuyang Y.[7]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[4]Univ Shanghai Sci & Technol, Sch Environm & Architecture, Shanghai 200093, Peoples R China;[5]Fuzhou Univ, Coll Environm & Safety Engn, Fujian Prov Engn Res Ctr Rural Waste Recycling Tec, Fuzhou 350116, Fujian, Peoples R China;[6]Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China;[7]Univ Hong Kong, Dept Civil Engn, Hong Kong, Peoples R China

年份：2025

卷号：272

外文期刊名：WATER RESEARCH

收录：;EI(收录号：20245117537080);WOS:【SCI-EXPANDED(收录号:WOS:001391583700001)】；

基金：This study was sponsored by the National Natural Science Foundation of China (52100085) , the Natural Science Foundation of Shanghai (21ZR1418000) , and the National Key R&D Program (2019YFC0408202) .

语种：英文

外文关键词：Polyamide membranes; Membrane degradation; Halogenation; Halogenating agents; Reaction kinetics

摘要：The kinetics of polyamide membrane degradation by free chlorine and halide ions (Br- and Cl-) were innovatively evaluated based on physicochemical properties and filtration performance, using water/solute permeability coefficient in addition to bromide incorporation as important indicators. The reaction rate constants for the reduced water and H3BO3 permeability coefficient were 1-2 orders of magnitude higher at 0-1 h than 1-10 h. N-bromination and bromination-promoted hydrolysis are dominant degradation mechanisms at 0-1 h (reflected by the breakage of hydrogen bond, the increased Ca binding content, and the increased charge density), and ring-bromination further occurs at 1-10 h (reflected by the disappearance or weakening of aromatic amide band and the nearly constant hydrogen bond). The more reactive but less abundant brominating agents (Br2O, BrOCl, BrCl, and Br-2) played significant roles in membrane degradation, contradicting the conventional belief that HOBr is the only reactive species. BrCl at pH 4.0 and BrOCl and Br2O at pH 7.0 made significantly higher contributions to membrane degradation than HOBr (>76 % vs. <13 %). The increased contribution of BrCl and Br-2 with the increased [Cl-] and [Br-](ex) (the excess bromide, defined as [Br-](o) - [HOCl](o) when [Br-](o) > [HOCl](o)), respectively, was responsible for the greater reduction of water permeability coefficient. The innovative and simple approach developed in this study provides important insights to evaluate and predict membrane degradation.