文献类型：期刊文献

英文题名：Efficient Mg2+/Li+ separation via graft modification of nanofiltration membrane fabricated by low-temperature interfacial polymerization

作者：Han, Rui[1];Fang, Yin-Xin[1];Xu, Zhen-Liang[1,3];Zheng, Yan[1];Yu, Lin[1];Xu, Sun-Jie[1,2,3]

机构：[1]East China Univ Sci & Technol, Chem Engn Res Ctr, Sch Chem Engn, Membrane Sci & Engn R&D Lab,State Key Lab Chem Eng, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Elect Chem Innovat Inst, Shanghai 200237, Peoples R China

年份：2025

卷号：730

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20251918385009);WOS:【SCI-EXPANDED(收录号:WOS:001503882400002)】；

基金：The authors gratefully acknowledge the financial support received from National Natural Science Foundation of China (22078092, 22208101 and 21176067) and Project funded by National Key R & D Program of China (2021YFB3801101 and 2021YFB3801103) , as well as the research funding provided by the Fundamental Research Funds for the Central Universities (JKA01241502) .

语种：英文

外文关键词：Surface grafting; Low-temperature interfacial polymerization; Quaternary ammonium; Mg2+/Li+ separation; Computational simulations

摘要：Positively charged polyethyleneimine (PEI) based nanofiltration (NF) membranes show considerable promise for Mg2+/Li+ separation, provided that issues related to low permeability and suboptimal separation efficiency are resolved. In this study, quaternary ammonium bromide was grafted onto low-temperature interfacial polymerization (LTIP) membranes through the Holman alkylation reaction to engineer the membrane structure and properties. The low-temperature (LT) oil phase inhibited acyl chloride hydrolysis, facilitating increased participation of PEI monomers in reaction. This reduced defect caused by large aggregated pores and created a more favorable environment for subsequent grafting. The modification effects of grafted monomers with varying alkyl chain lengths, along with the synergistic mechanism between the LT oil phase and grafting, were investigated through experiments, characterizations, density functional theory calculations, and, molecular dynamics simulations. The graft modification of LTIP membrane improved its positive charge and hydrophilicity, while also moderately increasing the pore size. This led to an outstanding permeability of 11.8 L m-2 h-1 bar-1 and a commendable Mg2+/Li + separation factor of 49.9. This study proposes a feasible approach for Mg2+/Li+ separation membranes.