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Polyelectrolyte modified PVDF membranes and anti-protein-fouling research

Authors： HU Dan, XIAO Weixin, WANG Xiaolin

Units： 1 School of Light Industry, Beijing Technology and Business University, Beijing 100048, China

KeyWords： polyvinylidene fluoride; antifouling; polyelectrolyte; surface grafting

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2020,40(4):62-71

Abstract：

To improve the anti-fouling performance of PVDF membranes, a two-step surface grafting polymerization method was used for hydrophilic-modification of the outer surface of PVDF hollow fiber microporous membrane with positively charged quaternary amine monomer (2-methacryloxyethyltrimethylammonium chloride, DMC) and negatively charged carboxylic acid monomer (2-carboxyethyl acrylate, CAA). First, the radical surface polymerization of hydroxyethyl methacrylate (HEMA) was initiated from the outer surface of the PVDF membrane to introduce the hydroxyl active site. Then, cerium ion (Ce4+) was used to initiate the copolymerization between DMC and CAA on the membrane surface to obtain polyelectrolyte-modified PVDF hollow fiber microporous membrane. By controlling the grafting reaction conditions, a modified membrane with high hydrophilicity, high permeation and good anti-protein-fouling performance was obtained. The results showed that the pure water flux of the polyelectrolyte-modified PVDF membrane maintained a high level reaching 912 L/[m2·h·(0.1MPa)]. The water contact angle of the modified membrane surface became 0° at 52s. At the same time, the modified membrane had excellent resistance to protein which showed low operating pressure rise rate in filtration of protein solution and low contaminant content on the membrane surface.

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AuthorIntro：

第一作者个人简介，胡丹，1990年出生，女，籍贯湖北，博士学位，北京工商大学讲师，研究方向为水处理技术、膜分离技术、聚结分离技术。联系电话010-68985446，E-mail：hud@btbu.edu.cn. *通讯作者邮箱：xl-wang@tsinghua.edu.cn

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