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Preparation of cation ion-exchange membranes by layer-by-layer self-assembly of ammonium persulfate/PDA-PEI

Authors： ZHANG Bin, LIU Jie, JI Zhiyong, WANG Jing ,ZHAO Yingying, XUE Wen, YUE Changhong, YUAN Junsheng

Units： 1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China; 2. Department of Equipment and Energy, Xuanhua Iron and Steel Group Co., Ltd. Xuanhua, 075100, China; 3. School of Chemical Engineering and Materials, Quanzhou Normal University, Quanzhou 362000, China

KeyWords： polydopamine; polyethyleneimine; layer-by-layer self-assembly; cation exchange membrane; selective permeability

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(2):80-86

Abstract：

Ammonium persulfate was used as the oxidant to improve the polymerization of dopamine in this paper. And the mono-valent ion selective cation exchange membrane was prepared by layer-by-layer self-assembly of dopamine and polyethyleneimine. The effect of ammonium persulfate on the oxidation process of dopamine polymerization and the effect of modified layers number on the membrane performance were investigated. The results show that ammonium persulfate could accelerate the oxidation process obviously and has little effect on the membrane selectivity. When the number of modified layers is 5, the composite membrane has higher selectivity to Mg2+ and Na+ (p(Na+/Mg2+)=6.92), and the membrane surface resistance was lower (R(Na+=3.36Ω·cm2) ).

Funds：

河北省重点研发项目（21373101D），河北省重点研发计划项目（22373703D）资助

AuthorIntro：

张斌（1996-），男，山东泰安人，硕士，从事方向为膜材料与膜改性方面的研究

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