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Preparation of Zwitterion Nanofiltration Membrane and Its Anti-fouling Performance

Authors： WANG Xinle1,2, LIU Minghui1,2, YU Haijun3, KANG Guodong3, CAO Yiming3, LI Xia4, FU Xiaoyan5

Units： 1. CNOOC EnerTech Beijing Research Institute of Engineering & Technology for Safety & Environment, Tianjin 300457; 2. CNOOC Energy Conservation and Environmental Protection Service Co., Ltd., Tianjin, 300457; 3. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023; 4. Zhongyuan University of Technology, Zhengzhou, 450007; 5. Dalian Ecological Environment Monitoring Center, Liaoning Province, Dalian 116023

KeyWords： Nanofiltration membrane; Grafting modification；Crosslinking；Antifouling

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(6):51-59

Abstract：

Polysulfone membrane was oxidized by potassium persulfate to produce active hydroxyl groups. The zwitterionic nanofiltration membrane was prepared by grafting and crosslinking the MPDSAH and AAm to the membrane surface. The changes of the membrane surface before and after modification were characterized by ATR/FTIR, XPS, SEM and Contact angle measurement. The effects of different proportions of MPDSAH and AAM in grafted solution on the permeation separation performance and antifouling performance of the membrane were investigated. The results showed that a new separation layer could be formed on the surface of the polysulfone membrane through chemical grafting and crosslinking. The surface hydrophilicity and rejection rate of the zwitterionic nanofiltration membrane gradually increased with the concentration of grafted monomer MPDSAH, but the flux firstly increased then decreased. The rejection order of different inorganic salts by the zwitterionic nanofiltration membrane was Na2SO4 > MgSO4 > NaCl > MgCl2. The grafted layer on the surface of the polysulfone membrane was stable and not easy to fall off during use.

Funds：

海油发展科技项目“高性能膜法油水分离技术”（HFKJ-CGXM-AQ-2020-01）；大连市科技创新基金应用基础研究项目“新型碟管式反渗透膜组件研发”（2019J12SN67）；辽宁省自然科学基金“新型油水分离膜的制备与应用基础研究”（2019-MS-313）；

AuthorIntro：

王新乐（1989-），男，山东聊城人，工程师，硕士，主要从事工业废水膜处理技术研究.

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