两性离子中间层调控的纳滤膜制备及其脱盐性能  

Preparation and desalination of nanofiltration membrane regulated by zwitterionic interlayer

作　　者：王晓磊[1,2,3] 余姜涛 王齐 孔志云[1,2,3] 魏俊富[1,3] WANG Xiaolei;YU Jiangtao;WANG Qi;KONG Zhiyun;WEI Junfu(State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China;School of Environmental Science and Engineering,Tiangong University,Tianjin 300387,China;Cangzhou Institute of Tiangong University,Cangzhou 061000,Hebei Province,China)

机构地区：[1]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387 [2]天津工业大学环境科学与工程学院,天津300387 [3]沧州市天津工业大学研究院,河北沧州061000

出　　处：《天津工业大学学报》2024年第5期16-23,共8页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(52070142);天津工业大学市级大学生创新创业训练计划资助项目(202210058105)。

摘　　要：为了打破纳滤膜的渗透性-选择性上限,制备兼具高渗透通量和高截留性能的薄层复合纳滤膜,首先在水解聚丙烯腈(HPAN)基膜表面沉积聚多巴胺/聚甲基丙烯酰乙基磺基甜菜碱(PDA/PSBMA)中间层,然后利用哌嗪(PIP)和均苯三甲酰氯(TMC)进行界面聚合,制备聚酰胺(PA)层;对膜的化学结构、形貌和表面特性进行表征,研究纳滤膜的性能。结果表明:中间层亲水且带负电,对膜孔未造成严重堵塞,优化了界面聚合反应界面;聚酰胺层的厚度仅为65 nm左右,聚酰胺层内部及其与支撑层之间存在大量通道,使纳滤膜纯水渗透性高达21.82 L/(m^(2)·h·bar)(1 bar=100 kPa);纳滤膜对盐的截留顺序为Na_(2)SO_(4)(98.87%)>MgSO_(4)(96.92%)>MgCl_(2)(50.14%)>NaCl(30.60%),Na_(2)SO_(4)截留率基本不受操作压力和盐浓度的影响,NaCl和Na_(2)SO_(4)的分离因子为61.42;此外,纳滤膜具有良好的抗污染性和长期稳定性,在海水淡化、饮用水净化等领域具有应用潜力。In order to overcome the upper bound of permeability-selectivity of nanofiltration(NF)membrane and prepare thin-film composite NF membranes with high permeability and high rejection,a polydopamine/poly(sulfobetaine methacrylate)(PDA/PSBMA)interlayer was deposited on the surface of hydrolyzed polyacrylonitrile(HPAN)substrate.Then polyamide(PA)layer was prepared by interfacial polymerization(IP)of piperazine(PIP)and trimesoyl chloride(TMC).The chemical structure,morphology and surface properties of membranes were characterized.The performance of NF membrane was discussed.The results indicated that the interlayer was hydrophilic and negatively charged,and did not cause serious blockage of the membrane pores,which led to the optimization of the reaction interface for IP process.The thickness of the PA layer was only about 65 nm,and a large number of channels were inside and underneath the PA layer,thus the pure water permeance of NF membrane was as high as 21.82 L/(m^(2)·h·bar)(1 bar=100 kPa).The salt rejections of the resulted NF membrane followed an order of Na_(2)SO_(4)(98.87%)>MgSO_(4)(96.92%)>MgCl_(2)(50.14%)>NaCl(30.60%),and the Na_(2)SO_(4)rejection was basically not affected by the operating pressure and the salt concentration.Meanwhile,the separation factor of NaCl/Na_(2)SO_(4)was 61.42.In addition,the NF membrane showed excellent antifouling property and long-term stability,which had potential for practical applications such as sea water desalination and drinking water treatment.

关 键 词：聚多巴胺(PDA) 聚甲基丙烯酰乙基磺基甜菜碱(PSBMA) 两性离子中间层 纳滤膜 脱盐 

分 类 号：TS102.54[轻工技术与工程—纺织工程] X703.1[轻工技术与工程—纺织科学与工程]