文献类型：期刊文献

英文题名：Reactivity of various brominating agents toward polyamide nanofiltration membranes

作者：Zhao, Huihui[1,2,3];Yang, Linyan[1,2,3];Chen, Xueming[4];Wang, Jinrui[1,2,3];Bai, Lichun[5];Cao, Guomin[1,3];Cai, Lankun[1,3];Tang, Chuyang Y.[6]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, 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]Fuzhou Univ, Coll Environm & Resources, Fujian Prov Engn Res Ctr Rural Waste Recycling Tec, Fuzhou 350116, Fujian, Peoples R China;[5]Cent South Univ, Sch Traff & Transportat Engn, Key Lab Traff Safety Track, Minist Educ, Changsha 410075, Peoples R China;[6]Univ Hong Kong, Dept Civil Engn, Pokfulam, Hong Kong, Peoples R China

年份：2023

卷号：305

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20224513071673);WOS:【SCI-EXPANDED(收录号:WOS:000899900200005)】；

基金：Acknowledgements This study was sponsored by the National Natural Science Founda-tion of China (No. 52100085) , Natural Science Foundation of Shanghai (No. 21ZR1418000, No. 19ZR1412800) and the National Key R&D Program (No. 2019YFC0408202) .

语种：英文

外文关键词：Polyamide membranes; Membrane oxidation; Bromination; Brominating agents; Reaction kinetics

摘要：Polyamide (PA) membranes, widely used for reverse osmosis and nanofiltration, are prone to bromination under chlorinated bromide-containing water conditions. Conventional wisdom generally assumes HOBr as the only active brominating agent responsible for PA membrane degradation, while some more reactive but less abundant brominating agents (including Br2O, BrOCl, BrCl and Br-2) under these conditions are often overlooked. The current study addresses this critical literature gap by systematically evaluating membrane degradation under various [Br-], [Cl-] and [HOCl] conditions. The observed pseudo-first-order rate constant of membrane degradation (k(m)(obs), using change in water flux as a surrogate indicator) was found to be well correlated to [Br-], [Cl-] and [HOCl] (R-2 > 0.90). The gradual increase of [Cl-] and [Br-] transforms the predominant brominating agent from HOBr to BrCl and Br-2, respectively, under excessive [Br-] conditions. The species-specific second -order reaction rate constants followed a decreasing order of k(BrCl)(m)(2.6 x 10(4) M-1.s(-1)) >k(BrOCl)(m) (2.0 x 10(3) M-1.s(-1)) >k(Br2O)(m)(9.6 x 10(2) M-1.s(-1)) >k(Br2)(m)(1.5 x 10(1) M-1.s(-1)) > k(HOBr)(m)(5.4 x 10(-1) M-1.s(-1)). Additional decay tests using benzanilide (BA) as a surrogate monomer compound confirmed BrCl as the most reactive species. Under typical seawater conditions (pH 8.0), the more reactive but less abundant BrCl had significantly greater contribution to membrane degradation (85 %) than HOBr (3 %). Under typical neutral wastewater conditions, both BrCl and HOBr contributed equally. The current study developed a novel characterization technique to assess membrane degradation by determining the kinetics of the oxidant-PA reactions.