摘要
提高膜表面的疏水性是解决空气过滤过程中出现膜润湿现象的必要手段,而提高膜孔隙率是解决空气过滤过程中压降过大的直接方法.本文以聚偏氟乙烯(PVDF)为膜材料,N,N-二甲基乙酰胺(DMAc)为溶剂,氯化锂为添加剂,采用非溶剂致相分离方法制备PVDF超疏水膜,考察了添加剂氯化锂对膜接触角以及空气过滤过程压降的影响.结果表明,当铸膜液中氯化锂质量分数为3%时,PVDF超疏水膜的表面接触角为161°,膜截面形成颗粒堆积的疏松结构,孔隙率达到83.1%,气体通量为52 mL/(m^(2)·s·Pa),压降为401 Pa,空气的过滤效率达到90%以上.
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 mass fraction of lithium chloride in the casting solution was 3%,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/(m^(2)·s·Pa),the pressure drop was 401 Pa,and the air filtration efficiency reached more than 90%.
作者
史艳阳
陈小乐
苗闪闪
方强
武春瑞
吕晓龙
SHI Yanyang;CHEN Xiaole;MIAO Shanshan;FANG Qiang;WU Chunrui;LYU Xiaolong(State Key Laboratory of Separation Membranes and Membrane Process,School of Material Science and Engineering,Tiangong University,Tianjin 300387,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2023年第5期12-19,共8页
Membrane Science and Technology
基金
国家自然科学面上基金项目(52170047)。
关键词
聚偏氟乙烯
超疏水膜
非溶剂致相分离法
空气过滤
polyvinylidene fluoride
superhydrophobic film
nonsolvent induced phase separation
air filtration
