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Structure design and performance characterization of polysulfone based composite forward osmosis membrane

Authors： FAN Zuwei, KE Chao, ZHOU Jianqiang, ZHANG Ruyi, XU Yuanjian, ZHANG Weidong

Units： 1. R&D Department, Beijing E&E Technologies Group Corporation Limited, Beijing 100044, China; 2. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

KeyWords： polyester mesh; polysulfone; polyamide; composite forward osmosis membrane; dehydration

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2018,38(2):66-72

Abstract：

Polyester (PET) mesh reinforced polysulfone (PSF) substrate membrane was fabricated via continuous preparation technology, and the single-skinned substrate membrane was achieved by two-step coating method; then composite forward osmosis (FO) membrane was prepared through interfacial polymerization on the top surface of the substrate membrane. The substrate membranes with PET mesh had decreased macrovoid connectivity, porosity and pure water flux; on the other hand, they possessed greatly improved strength and tenacity. After introducing PET mesh into the substrate membrane, the composite membranes had increased degree of internal concentration polarization during FO process; the composite membrane with single-skinned substrate had lower mass transfer resistance due to the looser bottom surface and interfacial macrovoid induced by partly exposed PET mesh, whose FO water flux was about 50% higher than the double-skinned with 2 mol/L NaCl solution as the draw solution. This study proposed a novel method to improve the FO membrane performance, and the fabrication of single-skinned substrate through structural design not only improved the water flux of the composite membrane but also reduced the occurrence of dehydration.

Funds：

北京市科技计划项目（Z161100001216004）

AuthorIntro：

第一作者简介：凡祖伟（1988—），男，安徽阜阳人，博士（后），工程师，从事聚合物膜材料、水环境污染控制技术等研发工作，E-mail：fanzwgoon@163.com

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