离子分离用电荷Janus结构单价选择性阳离子交换膜  

Monovalent Cation Exchange Membranes with Janus Charged Structure for Ion Separation

作　　者：王文广 张艳秋 杨晓彬 孙海翔 吴亚东 邵路 Wenguang Wang;Yanqiu Zhang;Xiaobin Yang;Haixiang Sun;Yadong Wu;Lu Shao(MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,State Key Laboratory of Urban Water Resource and Environment,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China;School of Environments,Harbin Institute of Technology,Harbin 150009,China;School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,State Key Laboratory of Urban Water Resource and Environment,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China [2]School of Environments,Harbin Institute of Technology,Harbin 150009,China [3]School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China

出　　处：《Engineering》2023年第6期204-213,M0008,共11页工程（英文）

基　　金：supported by the National Natural Science Foundation of China(21878062);the Natural Science Foundation of Heilongjiang Province for Distinguished Young Scholars(JQ2020B001);Heilongjiang Touyan Team(HITTY-20190033);Open Project of State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology)(QA202127)。

摘　　要：单价选择性阳离子交换膜(M-CEMs)已被广泛应用于环境修复和能量收集等领域,例如,从卤水和海水中提取Na^(+)或Li^(+)。然而,由于膜结构和材料的限制,M-CEMs存在渗透选择性低的问题。在此,我们提出了一种简单的方法以构建具有电荷Janus结构的新型M-CEMs,该结构由荷正电的均苯三甲酸/聚乙烯亚胺选择层和荷负电的商业阳离子交换膜(CEM)组成。选择性电渗析(SED)分析结果表明,具有电荷Janus结构的M-CEMs可以有效抑制多孔阳离子交换膜中存在的阴离子迁移问题,因而使这种具有电荷Janus结构的M-CEMs具有较高的渗透选择性和总阳离子通量。与最先进的单价选择性阳离子交换膜的分离性能相比,具有电荷Janus结构的M-CEMs对于Na^(+)/Mg^(2+)的最高渗透选择性可以达到145.77,这超过了目前单价选择性阳离子交换膜性能的“上限”,且对于Li^(+)/Mg^(2+)也具有优异的渗透选择性(14.11),在离子分离领域具有巨大的应用潜力。这项研究可以为具有电荷Janus结构的M-CEMs的设计提供新的见解,并应用于不同的环境和能源领域。Monovalent cation exchange membranes(M-CEMs)have been extensively applied in environmental remediation and energy harvesting such as the extraction of Na^(+)or Li^(+)from brine and seawater.However,owing to the limitations of membrane structures and materials,M-CEMs have a low permselectivity issue.Herein,we proposed a facile approach to construct a novel M-CEM with a Januscharged structure,consisting of a positively-charged trimesic acid/polyethylenimine surface thin layer and a negatively charged commercial cation exchange membrane(CEM).Selectrodialysis results indicated that the Janus-charged M-CEMs could effectively suppress the migration of anions,which often occurred in porous CEMs,thereby enabling the novel Janus-charged M-CEMs to possess high permselectivity and high total cation fluxes.Compared with state-of-the-art M-CEMs,the Janus-charged MCEM exhibited the highest perm-selectivity of 145.77 for Na^(+)/Mg^(2+)beyond the contemporary “Upper Bound”plot as well as the excellent perm-selectivity of 14.11 for Li^(+)/Mg^(2+),indicating its great potentials in ion separation.This study can provide novel insights into the design of Janus-charged M-CEMs for ion separation in diverse environmental and energy applications.

关 键 词：阳离子交换膜 渗透选择性 聚乙烯亚胺 荷负电 能量收集 环境修复 均苯三甲酸 迁移问题 

分 类 号：TQ425.236[化学工程]