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芯液组成对PVC-PFSA中空纤维共混膜性能的影响

作者：程亮，许振良，魏永明，袁海宽

单位：华东理工大学化学工程研究所膜科学与工程研发中心

关键词：聚氯乙烯；全氟磺酸；芯液；共混超滤膜

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2011,31(1):72-76

摘要：

以聚氯乙烯(PVC)为膜材料，N,N-二甲基乙酰胺(DMAc)为溶剂，全氟磺酸(PFSA)为添加剂，采用湿法制备了性能较好的PVC中空纤维共混超滤膜。研究了芯液组成对PVC-PFSA中空纤维膜性能的影响，研究结果表明：纯水通量随全氟磺酸浓度的增加而增加，可达153 L•m-2•h-1•bar-1。（换算成Pa）通过调节芯液中DMAc的含量，可以有效调控PVC-PFSA中空纤维膜的内表面和断面结构。PFSA含量2.5%，随着芯液中DMAc含量的增加，PVC-PFSA中空纤维膜断面的双排指状孔逐渐向单排指状孔过渡，孔隙率增大。当DMAc含量增加到95%时，在PVC-PFSA中空纤维膜的内表面可以形成明显的多孔状结构，膜通量大幅度提高，可达118 L•m-2•h-1•bar-1

PVC-PFSA hollow fiber blend ultrafiltration membrane were prepared using polyvinyl chloride (PVC) as a membrane material, N, N-dimethylacetamide (DMAc) as solvent, and perfluorinated sulfonic acid (PFSA) as additive. The effects of bore fluid composition on the performance of PVC-PFSA hollow fiber composite membrane were investigated. The results show that pure water permeation flux increase with the PFSA concentration and reach to 153 L•m-2•h-1•bar-1. （换算成Pa）The microstructure of PVC-PFSA hollow fiber membrane could be effectively controlled by adjusting the content of DMAc in the bore solution. With the increase of DMAc content, double finger-shaped voids on the cross-section of PVC-PFSA hollow fiber membrane gradually transition to a single row of finger void, porosity increases at the same time. Porous sponge-like structure appeared on the inner surface when the DMAc content increased to 95%, and the membrane flux increased to 118 L•m-2•h-1•bar-1.

基金项目：

化学工程联合国家重点实验室项目

作者简介：

程亮（1977— ），北京市人，硕士究生，主要从事膜分离技术的研究工作。

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