PI/ZIF-8杂化膜的制备及渗透汽化分离性能研究  

Preparation and pervaporation separation performance of PI/ZIF-8 hybrid membranes

作　　者：李太雨 马文中[1,2] 徐荣 张琪[1] 钟璟[1] LI Tai-yu;MA Wen-zhong;XU Rong;ZHANG Qi;ZHONG Jing(Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology,School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials,School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏省绿色催化材料与技术重点实验室,江苏常州213164 [2]常州大学材料科学与工程学院,江苏省环境友好高分子材料重点实验室,江苏常州213164

出　　处：《高校化学工程学报》2020年第3期648-655,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21406017);江苏省高等学校自然科学研究项目(18KJA430005,18KJA530001);江苏省研究生培养创新工程项目(KYCX18_2614);江苏省先进催化与绿色制造协同创新中心(常州大学)。

摘　　要：针对渗透汽化分离非质子溶剂/水体系过程中渗透性和选择性之间此升彼降的矛盾关系(trade-off效应),提出制备有机/无机杂化膜的方法。以均苯四甲酸酐(PMDA)和2,2’-双[4-4(氨基苯氧基)苯基]丙烷(BAPP)为聚酰亚胺(PI)单体,2-甲基咪唑锌(ZIF-8)为无机杂化粒子,采用两步法制备PI/ZIF-8杂化膜,并对杂化膜进行表征和渗透汽化分离性能测试。研究结果表明:ZIF-8可以为水分子提供额外的运输通道,并且引入ZIF-8增强了PI膜的耐溶剂性。当ZIF-8质量分数w(ZF-8)为2%时,杂化膜对于DMF质量分数w(DMF)为90%的体系,通量为242.2 g·m^-2·h^-1,分离因子为17.8;对于DMAC质量分数w(DMAC)为90%的体系,通量为126.2 g·m^-2·h^-1,分离因子为55.2。相比于未改性PI膜,分离DMF/H2O和DMAc/H2O体系中,PI/ZIF-8杂化膜的渗透通量分别提高了60%和40%。During pervaporation separation of aprotic solvent/water systems,trade-off between permeability and selectivity always happens.A method for the synthesis of organic/inorganic hybrid membranes was proposed for solving this problem.The PI/ZIF-8 hybrid membranes were prepared using pyromellitic dianhydride(PMDA)and 2,2-bis[4-(4-anlnophenoxy)phenyl]propane(BAPP) as polyimide(PI) monomers,2-methylimidazolium zinc(ZIF-8) as the inorganic hybrid particles through a two-step method.The PI/ZIF-8 hybrid membranes and their pervaporation separation performance were characterized.The results show that the ZIF-8 can provide additional transport pathways for water molecules and the PI membrane has better solvent resistance with the addition of ZIF-8.The hybrid membrane with w(ZIF-8) of 2% exhibits flux of 242.2 g·m^-2·h^-1 and separation factor of 17.8 for the 90% dimethylformamide(DMF)/H2 O system and the flux of 126.2 g·m^-2·h^-1 and separation factor of 55.2 for the 90% dimethylacetamide(DMAc)/H2 O system.Compared with the pristine PI membranes,the PI/ZIF-8 hybrid membranes display 60% and 40% increase in flux for the 90% DMF/H2 O system and 90% DMAC/H2 O systems,respectively.

关 键 词：聚酰亚胺 ZIF-8 杂化膜 非质子溶剂 渗透汽化 

分 类 号：TQ028.8[化学工程]