文献类型：期刊文献

英文题名：Magnesium-Induced Variation of Polyamide Membrane Behavior for the Treatment of Haloacetic Acids in Swimming Pool Waters

作者：Zhao, Huihui[1];Yang, Linyan[1,3,4];Chen, Xueming[2];Cai, Lankun[1,3];Li, Yejin[1];Sheng, Mei[1];Cao, Guomin[1,3,4];She, Qianhong[5,6]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Tech Univ Denmark, Proc & Syst Engn Ctr PROSYS, Dept Chem & Biochem Engn, DK-2800 Lyngby, Denmark;[3]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[5]Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore;[6]Nanyang Technol Univ, Singapore Membrane Technol Ctr, Nanyang Environm & Water Res Inst, Singapore 639798, Singapore

年份：2021

卷号：1

期号：2

起止页码：346

外文期刊名：ACS ES&T WATER

收录：WOS:【ESCI(收录号:WOS:000654115600014)】；

基金：This study was sponsored by the Natural Science Foundation of Shanghai (Programme 19ZR1412800) and the National Key R&D Program (2019YFC0408202).

语种：英文

外文关键词：haloacetic acids; magnesium ions; nano filtration; swimming pool water; disinfection byproducts (DBPs)

摘要：The co-presence of haloacetic acids (HAAS) and Mg2+ in swimming pool waters and the potential interaction among Mg2+,( )HAAS, and membranes prompted a systematic investigation of membrane performance affected by Mg2+. The rejection behavior of the tight NF90 was not significantly affected by Mg2+ due to the predominant role of size exclusion. For loose NF270, HAA rejection and water flux were reduced by 27% and 12%, respectively, after the addition of 5 mM Mg2+. The notable magnesium content in NF270 exposed in Mg2+ indicated the binding of Mg2+ to membranes. The interaction between Mg2+ and membranes resulted in a less negatively charged and hydrophilic surface and a smaller effective pore radius for membranes. The reduction of the effective pore size by Mg2+ was verified as a result of competing effects between "-COO--induced conformational change" and "cation-induced pore shielding". The increased permeability for charged HAAs and NaCl in the presence of Mg2+ was mainly attributed to charge neutralization, while the reduced permeability for neutral surrogates and water was due to the reduced effective pore size and hydrophilicity. The underlying mechanism for resolving the interaction among different divalent cations, trace contaminants, and polyamide membranes may have significant implications for practical water purification by membrane technologies.