CA/PEI辅助ZIF-L粒子原位生长制备高性能染料脱盐膜  

Dye desalinating mebranes containing in situ grown ZIF-L particles from cross linked coating networks of catechol and polyethyleneimine

作　　者：蔡达健 郑晨晨 李士洋 涂龙斗 薛立新 CAI Dajian;ZHENG Chenchen;LI Shiyang;TU Longdou;XUE Lixin(Membrane Separation and Water Science and Technology Center,School of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;School of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,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,杭州310014 [2]温州大学化学与材料工程学院,温州325035

出　　处：《膜科学与技术》2025年第1期78-91,共14页Membrane Science and Technology

基　　金：国家自然科学基金面上项目(NSFC-21975222)。

摘　　要：膜分离法因其具有高效、节能的优点,在处理印染废水实现资源回收方面具有较大的潜力.通过在聚砜(PSf)超滤膜上涂覆的聚乙烯亚胺(PEI)和儿茶酚(CA)的交联网络中原位生长锌咪唑框架微晶叶(ZIF-L)来构建高性能染料脱盐复合膜,并系统地研究了制备条件对膜表面结构及其染料/盐分离性能的影响.插入在交联网络中的ZIF-L粒子紧密堆叠,增加了复合膜的表面粗糙度和选择性水通道,大大提升了膜的溶液渗透性.优化制备条件后所得到的CA/PEI(ZIF-L)复合膜,其溶液渗透系数可达到1100.0 L/(m^(2)·h·MPa),是CA/PEI复合膜的10.4倍,对刚果红(CR)、甲基蓝(MB)和直接黑38(DB-38)截留率分别为99.12%、98.92%和99.35%,而对Na2SO4的截留率仅为1.35%,在染料/盐混合溶液中表现出良好的分离性能以及稳定性.Membrane separation,with its high efficiency and energy-saving advantages,holds significant potential in treating wastewater and recovering resources.In this work,thin film composite(TFC)membranes were constructed by in situ grown of zinc imidazole framework microcrystalline leaves(ZIF-L)in the cross linked coating networks of polyethyleneimine(PEI)and catechol(CA)on polysulfone(PSf)ultrafiltration membranes.The effects of preparation conditions on the TFC membrane surface structures and their dye/salt separation properties were systematically investigated.The closely packed ZIF-L particles in the cross linked polymeric networks inserted selective water channels and increased surface area,and greatly enhanced the water permeability of the TFC membranes.The water permeability coefficient of the CA/PEI(ZIF-L)composite membranes obtained after optimizations reached 1100.0 L/(m^(2)·h·MPa),which was 1o.4 times higher than that of the control CA/PEI composite membrane,with the high retention rates for Congo red(CR),Methyl blue(MB),and Direct Black 38(DB-38)as 99.12%,98.92%,and 99.35%,respectively,and the low retention rate of Naz SO4 as 1.35%,showing good separation performance as well as stability in treating dye/salt mixed solution.

关 键 词：ZIF-L 原位生长 染料/盐分离 复合膜 

分 类 号：TQ028.4[化学工程]