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Functional modification of zwitterionic polymers for PVDF membranes and the study on the performance

Authors： Xiaoji Zhou1,2.3, Tianshu Liu1,2, Yizhuo Sun1,2, Ying Cheng1,2, Renbi Bai1,2,3

Units： 1.Centert for Separation and Purification Materials and Technologies, Suzhou 215009, China; 2.School of Environment and Science and Engineering, Suzhou, Unuversity of Science and Technology, Suzhou, 215009, China 3. Jiangsu Collabrative Innovation Center of Technology and Material Treatment, Suzhou, Unuversity of Science and Technology, Suzhou, 215009, China

KeyWords： zwitterionic copolymers, modified PVDF membranes, anti-fouling performance

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(4):84-92

Abstract：

A zwitterion polymer P(Stx-co-CBMAy) was obtained from carboxylic betaine methyl acrylate (CBMA) and styrene (St) by reactive radical polymerization. The modified PVDF membranes were prepared by immersion precipitate phase transformation (NIPS) with addition of polymer and the properties of the membrane were tested and studied. By anylasis of ATR-FTIR and XPS, the zwitterion polymers were enriched on the surface of the modified membrane which obviously affected membrane microstructure includes surface and section structure. The porosity and thickness of the modified membrane increased obviously. The membranes surface charge distribution were changed and the isoelectric point increases due to the addition of zwitterion polymer, which has a certain effect on the anti-fouling performance of the membrane. Under the condition of static adsorption, the adsorption capacity of 1.0 g/L BSA and LYZ solution at pH=5.3 by modified membrane was significantly reduced showing excellent anti-fouling performance. Dynamic filtration experiments of BSA and SA showed that most of the pollution of modified membranes M-P1 to BSA and SA was reversible, and the flux recovery rate of the modified membranes maintained a high level.

Funds：

江苏水处理技术与材料协同创新中心预研项目（XTCXSZ2019-4）苏州分离净化材料与技术重点实验室（SZS201512）

AuthorIntro：

周晓吉（1988- ），女，硕士研究生，实验师，研究方向为高分子材料的制备及其对膜的改性。

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