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Preparation of PVDF superhydrophobic membrane and Preliminary study on air filtration

Authors： SHI Yanyang, CHEN Xiaole, MIAO Shanshan, FANG Qiang, WU Chunrui, LYU Xiaolong

Units： State Key Laboratory of Separation Membranes and Membrane Process, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China

KeyWords： polyvinylidene fluoride; Superhydrophobic film; Nonsolvent induced phase separation; air filtration

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(5):12-19

Abstract：

Improving the hydrophobicity of membrane surface is necessary to solve the membrane wetting phenomenon in air filtration process, while increasing the membrane porosity is a direct way to solve the excessive pressure drop in air filtration process. In this paper, PVDF superhydrophobic membranes were prepared using polyvinylidene fluoride (PVDF) as the membrane material, N,N-dimethylacetamide (DMAc) as the solvent and lithium chloride as the additive, and the effect of the additive lithium chloride on the contact angle and pressure drop of the membrane was investigated. The results showed that when the content of lithium chloride in the membrane was 3 wt.%, the surface contact angle of PVDF superhydrophobic membrane was 161°, the membrane cross-section formed a loose structure of particle accumulation, the porosity reached 83.1%, the gas flux was 52 mL/(m2·s·Pa), the pressure drop was 401 Pa, and the air filtration efficiency reached more than 90%.

Funds：

国家自然科学面上基金项目（52170047）

AuthorIntro：

史艳阳（1996-），河南商丘人，主要从事分离膜制备与应用，

Reference：

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