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曝气辅助聚多巴胺共沉积膜的制备与表征

作者：周庆莹，刘四华，厍景国，宋姿萍，高海富，王暄，武春瑞，吕晓龙

单位：省部共建分离膜与膜过程国家重点实验室，材料科学与工程学院，天津工业大学，天津 300387

关键词：曝气辅助沉积法；聚多巴胺/聚乙烯亚胺；中空纤维膜；亲水改性

DOI号：

分类号： TQ051.893；TQ325.4

出版年,卷(期):页码： 2022,42(5):17-23

摘要：

聚偏氟乙烯（PVDF）膜具有良好的物理化学稳定性和分离性能，以提升PVDF膜亲水性为目标的膜材料改性研究一直是膜研究的重点。聚多巴胺/聚乙烯亚胺（PDA/PEI）共沉积法可生成性能优异的亲水涂层，是制备亲水膜的重要方法。本研究针对疏水PVDF中空纤维膜的亲水改性，建立了曝气辅助PDA/PEI共沉积法，为多巴胺/聚乙烯亚胺（DA/PEI）溶液提供富氧环境，加快DA和PEI的反应速率，实现疏水中空纤维膜快速亲水化。相比于静置沉积，曝气辅助共沉积体系能够在反应90min后获得性能良好的亲水改性膜。曝气辅助沉积改性膜接触角为45.3°，纯水通量为201.2L/(m2·h)，渗透性能显著提升；改性膜具有优异BSA截留率。

Polyvinylidene fluoride (PVDF) membrane has good physical and chemical stability and separation performance. Improving the hydrophilicity of PVDF membranes has always been a hotspot of membrane modification. Polydopamine/polyvinyl imine (PDA/PEI) co-deposition is an important method to produce hydrophilic membranes with excellent properties. In this study, for hydrophilic modification of hydrophobic PVDF hollow fiber membranes, an aeration-assisted PDA/PEI co-deposition method was established to provide an oxygen-rich environment for DA/PEI solution. This strategy accelerated the reaction rate of DA and PEI, and achieved rapid hydrophilic modification of hydrophobic hollow fiber membranes. Compared with the static deposition, the aeration-assisted co-deposition method can increase the hydrophilicity of the modified membranes greatly after 90min reaction. The contact angle of the modified membranes was 45.3°, the pure water flux was 201.2L/(m2·h), and the permeability was significantly improved. The modified membranes had excellent BSA rejection.

基金项目：

国家自然科学面上基金项目（52170047）；国家自然科学基金重点项目（51638011）

作者简介：

周庆莹（1996－），女，天津市人，硕士研究生，研究方向为分离膜制备与应用；E-mail：zhouqingying1996@163.com

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