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CA/PEI辅助ZIFL粒子原位生长制备高性能染料脱盐膜

作者：蔡达健¹，郑晨晨¹，李士洋¹，涂龙斗¹，薛立新¹，²

单位： 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

关键词： ZIF-L; 原位生长; 染料/盐分离; 复合膜

DOI号： 10.16159/j.cnki.issn1007-8924.2025.01.009

分类号： TQ028.4

出版年,卷(期):页码： 2025,45(1):78-91

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1 100.0 L/(m2·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 1 100.0 L/(m2·h·MPa), which was 10.4 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 Na2SO4 as 1.35%, showing good separation performance as well as stability in treating dye/salt mixed solution.

基金项目：

国家自然科学基金面上项目（NSFC-21975222）

作者简介：

蔡达健（1998-），男，广东中山人，硕士生，研究方向为膜水处理技术

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