Membrane Science and Technology

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Study on the surface functionalization of PVDF hollow-fiber membrane with polydopamine and poly(ethylene glycol)(PEG)

Authors： YANG Linming1, LI Fang1*, DU Chunhui2, HUANG Lichao1, ZHU Yunfeng1, YANG Bo1

Units： 1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620; 2. College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 31003

KeyWords： PVDF hollow-fiber membrane; dopamine; hydrophilic modification; emulsified oil

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2014, 34(3):23-29

Abstract：

Polydopamine (PDOPA) deposition was used in this study to improve the surface hydrophilicity of the PVDF hollow-fiber membrane. In further, mPEG-NH2 was grafted on the PDOPA layer through the adhesion of PDOPA to functionalize the membrane surface. The effect of PDOPA deposition and PEG grafting was compared under various reaction condition, and the separation efficiency of oil/water emulsion was used to evaluate the performance of modified membranes. The results showed that the PDOPA modified PVDF hollow-fiber membrane increased in hydrophilicity after 480 min of dopamine deposition, the contact angle reduced from 84.9?to 50.1?, and the water penetration rate into membrane increased. Deposition time of PDOPA affected the pure water flux, with flux increasing 6.4% after 30 min of deposition. A lower decreasing rate of flux, a higher steady-state flux and a more excellent anti-fouling were observed for modified membranes during filtration of an oil/water emulsion. The PDOPA modified membranes got a further improvement in hydrophilicity after grafting mPEG-NH2, and the rejection of oil/water emulsion increased 13%. The results show that both the PDOPA modification and mPEG-NH2 grafting improve the PVDF hollow-fiber membrane performance in the treatment of oil/water filtration effectively.

Funds：

国家自然科学基金青年基金项目(No.20906011)

AuthorIntro：

杨林明(1988-)，男，山东烟台人，硕士研究生，从事膜法水处理研究，E-mail: ylmdhu@126.com;

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