膜科学与技术

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Research on modification and anti-pollution performance of
ion exchange membrane for electrodialysis

Authors： ZHANG Xiaohu1, GUO Xiaoyu1, XUE Jian2， ZHANG Yan1,3, HAO Xiaoping1, HUO Mengxin1, ZHANG Xian1

Units： 1. Shandong University of Aeronautics, Binzhou 256600, China; 2. Binhua Group Co., Ltd., Binzhou 256600, China; 3. Zhejiang University of Technology, Hangzhou, 310014, China

KeyWords： surface modification; anion-exchange membranes; anti-contamination properties

ClassificationCode：TQ028

year,volume(issue):pagination： 2025,45(2):127-137

Abstract：

The organic fouling of anion exchange membranes (AEMs) significantly compromises their industrial safety applications, and surface modification has been proven to be an effective solution. In this study, two natural substances, dopamine (DA) and chitosan (CTS), were selected as modifiers to investigate the antifouling properties of ion exchange membranes for electrodialysis. The AEM surface was first graft-modified with DA, rich in phenolic hydroxyl groups, as an intermediate layer. Subsequently, sulfonated chitosan (PCS) was prepared using the natural material CTS and coated onto the DA-grafted membrane surface to construct an antifouling layer. The structure and properties of the membrane were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, water contact angle, and desalination rate. The results showed that the water contact angle was reduced from 99.1° to 45.08° for the pristine membrane, and the dynamic contact angle was reduced to 33.8° at 20 s. The performance of the modified membrane was tested, and the desalination rate of M-PCS-48 (sulfonated chitosan secondary modified for 48 h) was 73.3% after 190 min of contamination by sodium dodecylbenzene sulfonate (SDBS). The transmembrane voltage on both sides of M-PCS-48 was almost unchanged in the 200 min fouling performance, which proved its good stability against fouling. By exploring the effects of modification conditions on the properties of modified membrane, it was found that the best modification effect was achieved by 4 g/L of DA and PCS modification for 48 h. Under these conditions, the M-PCS-48 modified anion exchange membrane enhanced significantly antifouling capability, excellent stability, and maintained desalination performance.

Funds：

山东省自然科学基金资助项目（ZR2022MB101, ZR2021ME218）; 山东省大学生创新创业训练计划项目(S202410449050)

AuthorIntro：

张小虎（1998-），男，安徽六安人，硕士研究生，研究方向为阴离子交换膜的有机污染及性能

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