蒸汽诱导相分离法制备PVDF多孔膜及其膜蒸馏性能研究
Study on the preparation of PVDF porous membranes by vapor-induced phase separation and its membrane distillation performance
马忠 1陈晓蓉 1彭艳 1蒋帅 1刘鑫如 1周守勇 1李梅生 1赵宜江1
作者信息
- 1. 淮阴师范学院化学化工学院,江苏省环境功能材料工程研究中心,淮安 223300
- 折叠
摘要
制备具有优异抗润湿性能的膜蒸馏(MD)用膜是膜分离领域的一个挑战.本文以聚偏氟乙烯(PVDF)为膜材料,N,N-二甲基甲酰胺(DMF)为溶剂,1,2-丙二醇为添加剂,采用蒸汽诱导相分离法(VIPS)制备了高疏水性PVDF多孔膜.考察了暴露时间、相对湿度以及蒸汽温度等工艺参数对PVDF多孔膜结构与性能的影响.结果表明,当暴露时间为1 min,相对湿度为85％,蒸汽温度为60 ℃时,PVDF多孔膜表面呈现出微/纳米分级结构,静态水接触角为141°,孔隙率约为78％.在使用含有表面活性剂的盐溶液作为进料液的DCMD实验中,所制备的PVDF疏水膜表现出20 L/(m2·h)的稳定水通量和接近100％的盐截留率.
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,relative humidity,and vapor temperature of the VIPS process were 1 minute,85％,and 60 ℃,respectively,the surface of the as-prepared PVDF porous membrane exhibited a micro/nano hierarchical structure,with a water contact angle of 141° and a porosity of about 78％.In the DCMD experiment using high salinity water containing surfactants as the feed solution,our membrane exhibited a stable water flux of 20 L/(m2·h)and a salt rejection rate of almost 100％.
关键词
膜蒸馏/聚偏氟乙烯/蒸汽诱导相分离/膜结构/膜润湿Key words
membrane distillation/polyvinylidene fluoride/vapor-induced phase separation/membrane structure/membrane wetting引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据