膜科学与技术

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A cross-linked anion exchange membrane with acid block performance was prepared based on PVDF-co-HFP

Authors： XUE Shangfeng,XU Geting,QI Zhifu,DONG Jun,LIU Chunhong,GAO Qiangsheng,SHEN Jiannan

Units： 1.Zhejiang Energy Group R & D Co., Ltd, Hangzhou 311121, China; 2.Zhejiang University of Technology, Hangzhou 310014, China； 3. Zhejiang Provincial Engineering Center for New Industrial Water Resources, Hangzhou 311121, China

KeyWords： acid concentration; anion exchange membrane; PVDF-co-HFP; electrodialysis

ClassificationCode：O658.6+8

year,volume(issue):pagination： 2023,43(2):68-79

Abstract：

The traditional anion exchange membrane has serious proton leakage during the acid concentration process of electrodialysis. Here, we used PVDF-co-HFP as the polymer backbone and vinylimidazole as the functional group to prepare a series of cross-linked acid-blocking anion-exchange membranes AEM-x (x= 1, 2, 3) and studied the difference between the acid-blocking membrane and the traditional anion-exchange membrane in the acid concentration process. The physical and chemical properties of the prepared membranes were confirmed by infrared and other characterization methods.In the process of electrodialysis, AEM-x has better acid-blocking performance than the traditional anion exchange membrane AHA, H+ concentration after acid concentration for 6 h is 0.64 M, 0.68 M and 0.74 M, which are higher than those of AHA (0.49 M respectively). In particular, AEM-3 has better acid concentration performance. It indicates that the more stable cross-linked structure is beneficial to the stability of the membrane structure making the membrane have better acid blocking performance. The research results imply that the prepared cross-linked anion exchange membrane has broad application prospects in the field of acid concentration.

Funds：

浙江浙能技术研究院科技项目，浙江省重点研发计划项目（2021C03170）

AuthorIntro：

薛上峰（1999-），男，浙江温州人，本科，助理工程师，研究方向为电厂化学环保，E-mail：1205717670@qq.com

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