二次界面聚合同步反扩散原位生长ZIF-8纳米粒子制备聚酰胺混合基质反渗透(RO)膜  

Thin-film nanocomposite(TFN)mixed matrix reverse osmosis(MMRO)membranes from secondary interface polymerization containing in situ grown ZIF-8 nano-particles

作　　者：张祚群 高扬[1] 白超杰 薛立新 ZHANG Zuoqun;GAO Yang;BAI Chaojie;XUE Lixin(Center for Membrane Separation and Water Science&Technology,College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China)

机构地区：[1]浙江工业大学化工学院膜分离与水科学技术中心,浙江杭州310014

出　　处：《化工进展》2023年第S01期364-373,共10页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金面上项目(NSFC-21975222)。

摘　　要：在聚砜超滤支撑膜上预负载锌离子,之后由间苯二胺(MPD)和均苯三甲酰氯(TMC)在支撑膜上进行界面聚合反应过程,得到包覆锌离子的聚酰胺层,随后在咪唑配体反扩散至聚酰胺层中原位生长ZIF-8的同时,MPD和膜上残留的酰氯基团进行二次界面聚合,并与ZIF上的Zn(Ⅱ)离子桥联,得到聚酰胺混合基质RO膜(PA^(2)/ZIF-8)。原位生长ZIF-8纳米颗粒所带来的聚酰胺界面非选择性缺陷由二次聚合修补,同时生长的ZIF-8纳米颗粒为水分子透过建立了额外的通道,从而在不牺牲截留率前提下,显著提升了水通量。本文讨论了二次界面聚合反扩散原位生长过程中预负载锌离子、二次界面聚合时间、咪唑配体及胺单体浓度对PA^(2)/ZIF-8混合基质膜反渗透性能的影响。据测试,PA^(2)/ZIF-8的水通量可达到63.9L/(m^(2)·h),可达原始TFC膜的2倍,并保持了98%以上的截盐率,并且在测试过程中拥有良好的耐酸碱性、长期稳定性以及抗污染性。Thin-film nanocomposite polyamide mixed matrix reverse osmosis(MMRO)membranes were prepared from secondary interface polymerization between m-phenylenediamine(MPD)and the residual acyl chloride groups of trimethylene chloride(TMC)from the PA layers of TFC-PA membranes while imidazole ligand was counter diffused through the PA layer to react with the Zn(Ⅱ)cations pre-loaded on the polysulfone ultrafiltration substrates to form ZIF-8 nano-particles(NPs).None-selective defects between the in situ grown ZIF-8 NPs and the PA layers were eliminated by the MPD linkage between Zn(Ⅱ)and ZIF-8 PA polymers while additional selective water permeating channels were built inside the formed ZIF-8 NPs,resulting in improved water flux without trading off salt rejection rates.The effects of pre-loaded zinc ion,secondary polymerization,imidazole ligand and amine monomer concentration on the reverse osmosis performance of the formed PA^(2)/ZIF-8 MMRO membranes were discussed.The water flux of PA^(2)/ZIF-8 MMRO membranes reached 63.9L/(m^(2)·h),almost doubled from the pristine PA membranes,keeping the same NaCl rejection above 98%,good long term operating and chemical stability,as well as anti-fouling capability.

关 键 词：反渗透 ZIF-8 原位生长 膜 脱盐 纳米粒子 

分 类 号：TQ028[化学工程]