可用于镁锂分离的双荷电纳滤膜研制  

Preparation of nanofiltration membranes with dually charged separation layer for Mg^(2+)/Li^(+)separation

作　　者：苗闪闪 史乐 宋姿萍 厍景国 陈小乐 武春瑞[1] 吕晓龙[1] MIAO Shanshan;SHI Le;SONG Ziping;SHE Jingguo;CHEN Xiaole;WU Chunrui;LYU Xiaolong(State Key Laboratory of Separation Membranes and Membrane Processes,School of Material Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]省部共建分离膜与膜过程国家重点实验室,材料科学与工程学院,天津工业大学,天津300387

出　　处：《膜科学与技术》2023年第4期37-43,共7页Membrane Science and Technology

基　　金：国家重点研发计划(2021YFC330010003);国家自然科学面上基金项目(51978466)。

摘　　要：近年来,随着新能源材料的快速发展,锂的需求量大幅上涨.为满足日益增长的锂需求,采用纳滤技术从盐湖提锂已成为一种趋势.通过调控纳滤膜表面电荷和孔径以提高Mg^(2+)的截留率和Li^(+)的渗透率,可显著提高Mg^(2+)/Li^(+)的选择性.采用氨乙基哌嗪(AEP)为水相单体、均苯三甲酰氯(TMC)为有机相单体,通过调控水相单体浓度变化,控制分离层致密性和正反面电荷,制备了具有镁锂选择性的平板纳滤膜.研究结果表明,采用该单体制备的纳滤膜对MgCl_(2)截留率为97.6%,单盐镁锂分离因子为24.5,在混盐体系(Mg^(2+)/Li^(+)质量比为20)中镁锂分离因子为44.8.In recent years,with the rapid development of new energy materials,the demand for lithium has risen dramatically.To meet the increasing demand for lithium,it has become a trend to use nanofiltration technology to extract lithium from the salt lake.The Mg^(2+)/Li^(+)selectivity can be significantly improved by modulating the surface charge and pore size of nanofiltration membrane to improve the rejection of Mg^(2+)and permeation of Lit.In this paper,N-aminoethyl piperazine(AEP)was used as aqueous monomer and trimesoyl chloride(TMC)as organic phase monomer to prepare flat plate nanofiltration membranes with Mg^(2+)/Li^(+)selectivity by regulating the concentration change of the aqueous phase monomer and controlling the denseness of the separation layer and the charge of the top and flip sides.It was found that the nanofiltration prepared with this monomer had a high MgCl_(2)rejection to 97.6%and high LiCl/MgCl_(2)separation factor to 24.5 in single salt solution.In addition,the prepared nanofiltration membranes had good separation selectivity(Sui,Mg=44.8)in the mixed salt system(Mg^(2+)/Li^(+)mass ratio of 20).

关 键 词：纳滤膜 氨乙基哌嗪 均苯三甲酰氯 镁锂分离 

分 类 号：TQ028.8[化学工程]