聚偏氟乙烯基复合正渗透膜的制备与表征  

Preparation and Characterization of Composite Forward Osmosis Membranes Based on Polyvinylidene Fluoride Substrates

作　　者：凡祖伟 张如意[1] 王蕾 贾伟 徐愿坚 张卫东 FAN Zuwei;ZHANG Ruyi;WANG Lei;JIA Wei;XU Yuanjian;ZHANG Weidong(Beijing E＆E Technologies Group Corporation Limited, 100044;Beijing University of Chemical Technology, 100029： Beijing, China)

机构地区：[1]北京新源国能科技集团股份有限公司,100044 [2]北京化工大学,北京100029

出　　处：《水处理技术》2018年第7期58-61,73,共5页Technology of Water Treatment

基　　金：北京市科技计划项目(Z161100001216004;Z161100001216009)

摘　　要：采用溶液相转化法制备高孔隙率、大通量聚偏氟乙烯(PVDF)膜作为复合正渗透膜基膜,研究通过改变基膜制备过程中的凝固浴温度,以及在铸膜液中加入高亲水性的氧化石墨烯(GO)来优化基膜及其复合膜的结构与性能。结果表明,凝固浴温度为40℃、GO的质量分数为0.06%时,所得复合膜的正渗透性能较好,分离层朝向原料液和分离层朝向汲取液模式下的纯水通量分别为14.7、21.84 L/(m^2·h)。扫描电镜观察发现,基膜断面由较薄皮层和半开放膜内大孔组成,GO的加入使膜内大孔体积增大,而对复合膜表面的峰谷结构影响较小。As the substrate membranes of the composite forward osmosis（FO） membranes, polyvinylidene fluoride（PVDF） membranes with high porosity and high flux were prepared through solution phase-inversion method. The structure and performance of the substrate membranes and composite membranes were optimized by changing the coagulant temperature and adding high hydrophilic graphene oxide（GO） into the dope solution. The results showed that, the composite membrane had optimal FO performance with water flux of 14.7 and 21.84 L/（m^2·h） at AL-FS mode and AL-DS mode, respectively,when the coagulant temperature was 40 ℃ and the mass fraction of GO was 0.06%. Scanning electron microscope（SEM） results showed that the crosssection of the substrate membranes consisted of thin skin layer and semi-open macrovoid, and the addition of GO made the macrovoid larger but had little influence on the ridge-valley structure of the composite membrane surface.

关 键 词：聚偏氟乙烯复合正渗透膜 界面聚合 氧化石墨烯 

分 类 号：TQ028.8[化学工程]