LiuYing,FanKeke,LiZhimeng,et al.Fabrication of UiO-66-SO3H Modified Cation Exchange Membranes and Mechanism for Enhanced Ion Selectivity[J].China Water & Wastewater,2026,42(15):30-37.
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Fabrication of UiO-66-SO3H Modified Cation Exchange Membranes and Mechanism for Enhanced Ion Selectivity

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第42卷 Number: 第15期 Page: 30-37 Column: Date of publication: 2026-08-01
Author(s):
Liu　Ying1;  Fan　Keke1;  Li　Zhimeng2;  Li　Guojin3; 4;  Chang　Suyun5;  Zhao Yunfeng6;  Chen Feng7;  Zhang　Xinbo1
（1. Tianjin Key Laboratory of Water Quality Science and Technology， School of Environmental and Municipal Engineering， Tianjin Chengjian University， Tianjin 300384， China； 2. School of Control and Mechanical Engineering， Tianjin Chengjian University， Tianjin 300384， China； 3. Tianjin Municipal Engineering Design and Research Institute Co. Ltd.， Tianjin 300392， China； 4. Tianjin Key Laboratory of Infrastructure Durability， Tianjin 300042， China； 5. Tianjin Water Resources Research Institute， Tianjin 300061， China； 6. National Pipeline Network Group Northern Pipeline Co. Ltd.， Langfang 065000， China； 7. School of Civil Engineering and Architecture， North China Institute of Aerospace Engineering， Langfang 065000， China）
Keywords:
seawater desalination;  electrodialysis;  cation exchange membrane;  monovalent selectivity;  UiO-66-SO3H
Abstract:
Electrodialysis (ED) desalination technology has attracted considerable attention, with the performance of its core component, the cation exchange membrane (CEM), being of paramount importance. To address the poor monovalent ion selectivity of conventional CEMs, this study employed a layer-by-layer self-assembly method, utilizing polydopamine (PDA) as an adhesive layer and introducing a composite layer of polyethyleneimine (PEI) and sulfonated metal-organic framework (UiO-66-SO3H). A PDA/PEI/UiO-66-SO3H triple synergistic modification strategy was proposed, leading to the fabrication of a selective cation exchange membrane. The microstructure, surface properties, and ion separation performance of the modified membrane were systematically investigated. Results indicated that UiO-66-SO3H nanoparticles could be stably and efficiently immobilized on the membrane surface, significantly enhancing membrane hydrophilicity and ion exchange capacity. The monovalent ion selectivity for Na+/Mg2+ increased remarkably from 2.12 to 32.83, and that for Li+/Mg2+ from 0.99 to 14.75, demonstrating excellent monovalent ion sieving capability. This strategy effectively integrates size sieving, electrostatic attraction, and regulation of ion hydration properties, with the synergistic enhancement mechanism identified as the key to achieving high monovalent selectivity in the modified membrane.
Last Update: 2026-08-01