膜科学与技术

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Preparation and characterization of aeration-assisted polydopamine co-deposition membranes

Authors： ZHOU Qingying, LIU Sihua, SHE Jingguo, SONG Ziping, GAO Haifu, WANG Xuan, WU Chunrui, LYU Xiaolong

Units： State Key Laboratory of Separation Membranes and Membrane Process, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China

KeyWords： aeration-assisted deposition method, polydopamine/polyethylene imine, hollow fiber membrane, hydrophilic modification

ClassificationCode：TQ051.893；TQ325.4

year,volume(issue):pagination： 2022,42(5):17-23

Abstract：

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.

Funds：

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）

AuthorIntro：

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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