Study on preparation and properties of green low-cost cation exchange membrane

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Abstract Matrix materials of traditional homogeneous cation exchange membrane (CEM) are side-chain sulfonated polymers. The preparation process of this kind of polymer is complex and the preparation reagent is highly toxic, which highlights the short board of preparing CEM from this kind of material. In this work, polyether sulfone (PES) was used as the skeleton matrix material of CEM, polymer sulfonated polyether sulfone (SPES) and sodium dodecyl sulfonate (SDS) were used as the matrix functional materials, and polyvinylpyrrolidone (PVP) was used as the hydrophilic regulator to prepare homogeneous CEM. The prepared CEM was applied to the desalination of brackish water to investigate its practicability. The research results show that SDS and SPES are stable in the prepared CEM. The surface and cross section structure of the prepared CEMS are regular and free of defects, and the compatibility of the matrix materials is good. CEM is used for the desalination of brackish water by electrodialysis (ED). The design initial salt concentration is 5 000 mg·L^-1. When the desalination rate reaches 90%, the energy consumption of the prepared CEM, domestic Tingrun commercial CEM, and commercial Astom CEM are 10.1, 11.7, and 9.2 kWh·m^-3, respectively. The current efficiency are 92.3%, 92.7% and 95.5%, respectively. The combination of SPES and SDS as the matrix functional material has more advantages than SPES or SDS alone as the matrix material. SPES and SDS can jointly control and optimize the mass transfer performance of CEM.

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	ZHAO Jinli
	WANG Jianyou
	ZHANG Yuzhong

Keywords： cation exchange membrane desalination of brackish water polyether sulfone synergism

Received 2022-12-14;

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Corresponding Authors: 王建友,教授,E-mail:wangjy72@nankai.edu.cn。 Email: wangjy72@nankai.edu.cn

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ZHAO Jinli, WANG Jianyou, ZHANG Yuzhong.Study on preparation and properties of green low-cost cation exchange membrane[J] Chemcial Industry and Engineering, 2023,V40(3): 32-40

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