Stabilization of composite hollow fiber nanofiltration membranes with a sulfonated poly(ether ether ketone) coating

• Published in: Desalination Vol. 355; pp. 83 - 90
• Main Authors: Song, Jianfeng, Li, Xue-Mei, Li, Zhansheng, Zhang, Mengxi, Yin, Yong, Zhao, Baolong, Kong, Dingfeng, Chen, Gang, He, Tao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2015
• Subjects: Coating; Cross-linking; Ethers; Fibers; Membranes; Nanofiltration; Rejection; Reptation; Stability; Sulfonated poly(ether ether ketone); Swelling; Nanofiltration; Stability; Sulfonated poly(ether ether ketone); Cross-linking; Reptation
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/j.desal.2014.10.011

Composite hollow fiber nanofiltration membrane coated with a thin layer of sulfonated poly(ether ether ketone) (SPEEK) can separate monovalent ions from multivalent ions with a low energy demand. It has found applications in desalination of glyphosate wastewater and removal of arsenic from drinking water. Before large scale application of such membranes, one of the main issues is the long time performance stability. This paper reports, for the first time, systematic investigations on the origins of the instability of the SPEEK composite membrane in aqueous phase. Membrane preparation parameters, the coating polymer concentration, the coating time, and the post-treatment temperature were correlated to the membrane stability. A reptation mechanism was proposed to explain the rejection decline and flux increase with time, based on swelling and dissolution of SPEEK. To reduce the swelling and loss of SPEEK, a PVA/SPEEK blend was used as the coating layer, which after cross-linking by glutaraldehyde, yielded a NF membrane with constant rejection during 2000h of operation. [Display omitted] •Origin of instability of SPEEK nanofiltration membranes is revealed.•Reptation rate of polymer chains determines membrane rejection.•Stable performance for SPEEK-PVA cross-linked membrane over 2000h was obtained.•Constraints help to reduce the loss rate of SPEEK.