高等学校化学学报2024，Vol.45Issue(6)：143-151,9.DOI:10.7503/cjcu20230484
二次界面聚合法制备具有高锂镁分离性能的电纳滤膜
Preparation of Electro-nanofiltration Membranes with High Li+/Mg2+Separation Performance via Sequential Interfacial Polymerization
摘要
Abstract
Highly selective electro-nanofiltration membranes(ENFMs)were prepared by regulating the aqueous-phase monomers of interfacial polymerization(IP)and constructing the positively charged surface by sequential interfacial polymerization(SIP)for the separation of lithium and magnesium by selective electrodialysis processes.The IP reaction was carried out using different aqueous-phase monomers with trimesoyl chloride to achieve the regula-tion of the pore size and charging property of the separation membranes.The optimum Li+/Mg2+separation performance(4.75)of the membrane was achieved when piperazine was used as the aqueous-phase monomer.Subsequently,the SIP reaction was utilized to introduce positively charged aqueous-phase monomer polyethyleneimine(PEI,MW=70000)of different concentrations on the optimal IP membrane surface,which converted the charge of the membrane surface from negative to positive.With the increase of PEI concentration,the positive charge density on the membrane surface increased significantly;the optimal SIP membrane achieved outstanding selectivity for Li+/Mg2+(15.90)and high Li+flux(3.26×10-8 mol⋅cm‒2⋅s-1),which breaks the traditional"Trade-off"effect and lays the foun-dation for the subsequent research and application of Li+/Mg2+separation salt-lake brines.关键词
界面聚合/电纳滤膜/选择性电渗析/Li+/Mg2+分离Key words
Interfacial polymerization/Electro-nanofiltration membrane/Selective electrodialysis/Li+/Mg2+separa-tion分类
化学化工引用本文复制引用
刘慧莉,汪婧,陈加帅,宋治昊,蒋雨萌,郭志远,张盼盼,纪志永..二次界面聚合法制备具有高锂镁分离性能的电纳滤膜[J].高等学校化学学报,2024,45(6):143-151,9.基金项目
国家自然科学基金(批准号:22108057)和河北省重点研发计划项目(批准号:21373101D)资助. Supported by the National Natural Science Foundation of China(No.22108057)and Hebei Province Key R&D Program,China(No.22108057). （批准号:22108057）
