文献类型：期刊文献

英文题名：Mechanistic insights into the degradation of monovalent selective ion exchange membrane towards long-term application of real salt lake brines

作者：Ying, Jiadi[1];Lin, Yuqing[1];Zhang, Yiren[1];Jin, Yan[1];Li, Xin[2];She, Qianhong[2,3];Matsuyama, Hideto[4];Yu, Jianguo[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Comprehens Utilizat Salt Lake R, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Nanyang Technol Univ, Nanyang Environm & Water Res Inst, Singapore Membrane Technol Ctr, 1 Cleantech Loop, Singapore 637141, Singapore;[3]Nanyang Technol Univ, Sch Civil & Environm Engn, 50 Nanyang Ave, Singapore 639798, Singapore;[4]Kobe Univ, Res Ctr Membrane & Film Technol, Dept Chem Sci & Engn, Kobe 6578501, Japan

年份：2022

卷号：652

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20221211826149);WOS:【SCI-EXPANDED(收录号:WOS:000790346700001)】；

基金：Acknowledgments The research was supported by National Nature Science Foundation of China (U1707601) .

语种：英文

外文关键词：Electrodialysis; Ion exchange membrane; Real brine; Degradation; Long-term application

摘要：The coexistence and interaction of monovalent selective electrodialysis membranes with real brines prompt us to investigate the mechanistic insights into the deterioration in separation efficiency of membranes for their practically long-term applications. In this work, the polyethyleneimine (PEI)/poly(styrene-divinylbenzene) (PSDVB) monovalent selective ion exchange membrane (IEM) was exposed to the brines from Llullaillaco Salt Lake (Argentina) with highly concentrated total dissolved solids (TDS) for the practically long-term operation for up to 30 days. A concurrent degradation of surface nanostructure and charge functionalization of the IEM membrane occurred, leading to a decreased mono-/divalent permselectivity from 16.60 to 5.67 (i.e., K+/Mg2+), before/after being treated by real brines (409 g/L TDS concentration). The declined separation property is believed to be attributable to the surface degeneration, because of the reduction in electrostatic interactions between the PEI active layer and the PS-DVB support. This is caused by the amassed ions that disturb and/or even destroy the ionic crosslinking interactions between oppositely charged ammonium-(PEI) and sulfonate-based (PS-DVB) polyelectrolytes. From these findings in this study, we develop a fundamental understanding to unveil the decomposition of the ionic crosslinking network of monovalent selective IEMs, within highly salinity solutions, offering guidance for the electrodialysis practical applications, but beyond the salt lake brines.