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基于PVDF-co-HFP制备具有阻酸性能的交联型阴离子交换膜的研究

作者：薛上峰，徐格婷，祁志福，董隽，刘春红，高强生，沈江南

单位： 1.浙江浙能技术研究院有限公司，杭州 311121；2.浙江工业大学化工学院，杭州，310014；3. 浙江省工业新水源工程中心，杭州 311121；

关键词：酸浓缩；阴离子交换膜；PVDF-co-HFP；电渗析

DOI号：

分类号： O658.6+8

出版年,卷(期):页码： 2023,43(2):68-79

摘要：

传统阴离子交换膜在电渗析酸浓缩过程中存在着严重的氢离子泄露。在此，我们采用PVDF-co-HFP作为聚合物主链，乙烯基咪唑作为功能基团，通过不同刚柔性交联剂的加入制备了系列交联型阻酸阴离子交换膜AEM-x（x=1，2，3）并研究了阻酸膜与传统阴离子交换膜在酸浓缩过程中的不同。通过红外等表征手段证实了所制备膜的理化性质。在电渗析过程中，AEM-x相较于普通的阴离子交换膜AHA具有更好的阻酸性能，其酸浓缩6 h后H+浓度分别为0.64 M，0.68 M和0.74 M均大于AHA（0.49 M）。特别地，AEM-3具有更好的酸浓缩性能，这表明了更稳定的交联结构有利于膜结构的稳定性，从而使得膜具有更好的阻酸性能。研究结果表明，所制备的交联型阴离子交换膜在酸浓缩领域具有广阔的应用前景。

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.

基金项目：

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）

作者简介：

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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