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Study on the preparation of PVDF porous membranes by vapor-induced phase separation and its membrane distillation performance

Authors： MA Zhong, CHEN Xiaorong, PENG Yan, JIANG Shuai, LIU Xinru, ZHOU Shouyong, LI Meisheng, ZHAO Yijiang

Units： School of Chemistry and Chemical Engineering, Jiangsu Engineering Laboratory for Environment Functional Materials, Huaiyin Normal University, Huaian 223300, China

KeyWords： Membrane distillation; Polyvinylidene fluoride; Vapor-induced phase separation; Membrane structure; Membrane wetting

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2024,44(1):56-62

Abstract：

Preparing membranes with excellent anti-wetting properties for membrane distillation (MD) is a challenge in the field of membrane separation. This article uses polyvinylidene fluoride (PVDF) as the membrane material, N,N-dimethylformamide (DMF) as the solvent, and 1,2-propanediol as the additive to prepare highly hydrophobic PVDF porous membranes through vapor-induced phase separation (VIPS) method. The effects of process parameters such as exposure time, relative humidity (RH), and vapor temperature on the structure and performance of PVDF porous membranes were studied. The results showed that when the exposure time was 1 minute, the relative humidity was 85%, and the vapor temperature was 60℃, the surface of PVDF porous membrane exhibited a micro/nano hierarchical structure, with a static water contact angle of 143° and a porosity of about 78%. In the MD experiment using high salinity water containing surfactants as the feed, the prepared PVDF hydrophobic membrane exhibited a stable water flux of 20 L m-2 h-1 and a salt rejection rate of nearly 100%.

Funds：

国家自然科学基金项目（52303125）

AuthorIntro：

马忠（1989－），男，江苏淮安人，博士，讲师，主要从事膜材料与过程研究，E-mail: mazhong@hytc.edu.cn

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