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Study on the preparation and desalination performance of sulfonic acid-functionalized double-layer COF membranes

Authors： LIU Enbin1, WANG Haitao1, CHANG Na2, LI Zhonghua3,
ZHAO Yingying4, LIU Zihao1, XU Yinong3, LIU Peng3, CHEN Donggen3

Units： 1. College of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China;
2. College of Chemical Engineering and Technology, Tiangong University , Tianjin 300387, China;
3. Zhejiang Jinmo Environmental Technology Co., Ltd., Shaoxing 312000, China;
4. College of Materials Science and Engineering, Tiangong University, Tianjin 300387, China

KeyWords： covalent organic frameworks; interfacial polymerization; vacuum filtration; desalination

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2026, 46(4):12-23

Abstract：

Covalent organic frameworks (COFs), featuring precisely tunable pore sizes, highly ordered channels, and excellent chemical stability, have emerged as promising candidates for next-generation desalination membranes. In this study, TpPa-SO3H was employed as the core material, and by integrating vacuum-assisted filtration with interfacial polymerization, a double-layer COF membrane was successfully constructed on a polysulfone (PSf) substrate. Characterization confirmed the stable deposition of TpPa-SO3H nanosheets and the formation of a continuous and dense separation layer, endowing the membrane with excellent hydrophilicity and strong negative surface charge. The optimized membrane exhibited a water permeance of 24.93 L/(m2·h·MPa) and a Na2SO4 rejection of 93.40%, with stable performance over 72 h. The enhanced desalination performance is attributed to the synergistic effect of size sieving and electrostatic interactions, providing an effective strategy for the development of high-performance COF-based desalination membranes.

Funds：

山东省重点研发计划项目（2022CXGC020416）

AuthorIntro：

刘恩彬（2000-），男，河北邢台人，硕士研究生，主要研究方向为共价有机框架膜材料的制备与性能研究. *通讯作者,刘鹏，E-mail：liup@jinmo.com.cn；陈董根，E-mail：chendg@jinmo.com.cn

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