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Preparation and performance study of anion exchange membranes
based on PVA/EVOH/PEI ternary blend system

Authors： WANG Zhongli1, ZHAO Hua2

Units： 1. College of Environment and Life Health, Anhui Vocational and Technical College， Hefei 230061，China; 2. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230009,China

KeyWords： acid recovery; anion exchange membrane; polyvinyl alcohol; ethylene-vinyl alcohol; polyethyleneimine

ClassificationCode：TQ021.4

year,volume(issue):pagination： 2025,45(3):145-154

Abstract：

The discharge of acidic wastewater poses significant threats to soil and environmental quality, underscoring the urgent need for effective treatment strategies. Among various methods, diffusion dialysis (DD) is an important method for treating acidic wastewater, and its core lies in the preparation of anion exchange membranes (AEMs). This study successfully prepared a series of AEMs by mixing polyvinyl alcohol (PVA), ethylene vinyl alcohol copolymer (EVOH), and polyethyleneimine (PEI). The structure of the membrane was characterized using techniques such as Fourier transform infrared spectroscopy, scanning electron microscopy, and atomic force microscopy. In addition, its water absorption rate, swelling rate, thermal stability, chemical stability, and mechanical stability were tested. The experimental results showed that the acid dialysis coefficient (UH+) of the prepared membrane ranged from 11.8 to 44.5×10-3 m/h. The range of separation factor (S) values was from 23 to 57, all of which were superior to commercial DF-120B (UH+ is 4×10-3 m/h, S is 24.3) and DF-120 (UH+ is 9×10-3 m/h, S is 18). The membrane prepared in this study has good application prospects in acid recovery.

Funds：

安徽省高校科研项目重大项目（2024AH040121, 2023AH040197）

AuthorIntro：

王中立（1987-），男，安徽合肥人，副教授，硕士，研究方向为功能型高分子材料与应用

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