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Hydrophillicsurface modification of PVDF membrane by Poly(L-DOPA) coating and MPEG-NH2 grafting

Authors： WANG Shuai, LI Fang, LI Yong, PAN Ting, YANG Bo, TIAN Qing

Units： College of Environmental Science and Engineering, Donghua University, Shanghai 201620

KeyWords： L-DOPA;PVDF membrane; hydrophilicity; MPEG-NH2; surface modification

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(1):42-48

Abstract：

Thehydrophobic PolyvinylideneFluoride(PVDF) membranes was surface modified by coating 3-(3,4-Dihydroxyphenyl)-L-alanine(L-DOPA) and grafting methoxypolyethylene glycol amine(MPEG-NH2). In a Tris solution, the polymers of L-DOPA were formedby the oxideinteractionof the monomers, then adhere on the membrane surface to form a coating layer. Further, the MPEG-NH2 with brush structure was grafted on the coating layer with covalent bonds. To analysis the characteristics and morphologyof nascent membrane and modified membranes, the measurements, such as contact angle, fouriertransform infrared spectrometer(ATR-FTIR),scanning electoralmicroscopy(SEM) were employed.The antifouling ability and separation efficiency of these membranes was also investigated with oil/water emulsion filtration tests. It was found that although thepore size and the water flux reduced after the modification of L-DOPA coating and MPEG-NH2 grafting. Thehydrophilicityand rejection efficiency of the modified membranes enhanced significantly comparing to the nascent membrane. In the emulsion filtration tests, the antifouling and flux recovery after cleaning were improved after the membrane modification.

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AuthorIntro：

汪帅[作者简介：汪帅（1990-），男，安徽桐城，硕士，东华大学，主要研究水处理和膜分离，Email:ss0828@163.com

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