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共沉积-交联法制备PDA/PEI-PVDF中空纤维复合超滤膜

作者：冯子腾，王彤，林亚凯，汪林，余立新，王晓琳

单位： 1清华大学化学工程系膜材料与工程北京市重点实验室，北京 100084； 2镇江清研膜业科技有限公司，江苏镇江 212141

关键词：复合超滤膜；多巴胺；聚乙烯亚胺；共沉积；亲水性

DOI号：

分类号： TQ 028.8

出版年,卷(期):页码： 2024,44(2):45-54

摘要：

聚偏氟乙烯（PVDF）膜以其出色的化学稳定性、优异的耐高温性能和机械强度在许多领域得到广泛应用，而对膜孔径和亲水性的精确控制是优化膜分离效率、稳定性和持久性的关键。本文采用多巴胺（DA）与聚乙烯亚胺（PEI）共沉积并通过戊二醛实现交联的方法，将PVDF中空纤维膜的孔径从（119.0±3.55） nm减小到（16.2±0.36 ）nm，接触角由107.7°下降至61.4°，同时实现了膜孔径和亲水性调控，制备出高性能PDA/PEI-PVDF中空纤维亲水超滤膜。本研究为超/微滤膜的性能调控提供了新思路。

Polyvinylidene fluoride (PVDF) membranes are extensively employed across various fields owing to their remarkable chemical stability, elevated temperature resistance, and robust mechanical strength. The precise modulation of membrane pore dimensions and hydrophilicity plays a pivotal role in optimizing membrane separation efficiency, stability, and longevity. In this study, we proposed a co-deposition method of dopamine (DA) and polyethyleneimine (PEI) with cross-linking through glutaraldehyde to regulate the pore size and hydrophilicity of PVDF hollow fiber membranes. Reduction of the pore diameter from （119.0 ± 3.55） nm to （16.2 ± 0.36） nm and contact angle from 107.7° to 61.4° was achieved, simultaneously achieving membrane pore size and hydrophilicity regulation, leading to the preparation of a high-performance PDA/PEI-PVDF hollow fiber hydrophilic ultrafiltration membrane. The resulting membrane exhibited a rejection rate of more than 95% for 20 nm silica nanoparticles. The findings of this study provide a novel approach for tuning the performance of ultrafiltration/microfiltration membranes.

基金项目：

国家自然科学基金面上项目（22378225）；国家重点研发计划项目（2022YFC2105103）；清华大学春风基金项目（2021Z99CFY024）

作者简介：

冯子腾（2001-），男，安徽阜阳人，硕士研究生，主要从事微孔膜表面改性研究，E-mail：fengzt22@mails.tsinghua.edu.cn

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