In-situ construction of antifouling separation layer via a reaction enhanced surface segregation method. (23rd November 2018)

• Record Type: Journal Article
• Authors: He, Mingrui; Su, Yanlei; Zhang, Runnan; Liu, Yanan; Zhang, Shiyu; Jiang, Zhongyi
• Is Part Of: Chemical engineering science. Volume 190(2018)
• Page Start: 89
• Page End: 97
• Publication Date: 2018-11-23
• Subjects: Reaction enhanced surface segregation -- Ultrafiltration membrane -- Separation layer -- In-situ construction -- Antifouling and separation performance; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2018.06.020
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: A reaction enhanced surface segregation method was first explored. An antifouling separation layer was in-situ constructed at membrane surface. The thickness and the effective pore size of the layer could be manipulated. The resulting membranes exhibited good ultrafiltration performance. Abstract: In this study, a reaction enhanced surface segregation method was explored for in-situ construction of antifouling separation layer on membrane surface. Polyvinyl pyrrolidine (PVP) is used as the surface segregation agent in the casting solution and polyacrylic acid (PAA) is used as the additive in the coagulation bath. During the membrane formation process, PVP and PAA spontaneously migrate to the surface of the polyvinylidene fluoride (PVDF) support in an opposite direction and form a crosslinked separation layer based on the hydrogen bonding interaction. The resultant layer has smaller effective pore size and higher hydrophilicity compared with the PVDF control membrane, which renders enhanced antifouling and separation performance. In the ultrafiltration of oil–water emulsion, the rejection was 100%, the initial water flux was 695 ± 33 L m −2 h −1 bar −1, and the FRR was 95.2%; meanwhile, in the ultrafiltration of BSA solution, the rejection was 90.3%, the initial water flux was 603 ± 18 L m −2 h −1 bar −1 and the FRR was 92.3%. This study offered a novel and facile method for antifouling membrane surface construction.