Composite nanofiltration membranes via the co-deposition and cross-linking of catechol/polyethylenimine. Issue 41 (7th April 2016)

• Record Type: Journal Article
• Authors: Qiu, Wen-Ze; Lv, Yan; Du, Yong; Yang, Hao-Cheng; Xu, Zhi-Kang
• Is Part Of: RSC advances. Volume 6:Issue 41(2016)
• Page Start: 34096
• Page End: 34102
• Publication Date: 2016-04-07
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra04074h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Composite NF membranes are fabricated based on the co-deposition of CCh/PEI. The optimized membranes possess high rejection of multivalent ions with acceptable flux and show excellent operational stability over long-term filtration process. Abstract : High performance nanofiltration (NF) membranes are facilely fabricated via the co-deposition of catechol (CCh) and polyethylenimine (PEI) on the surface of a polysulfone (PSf) ultrafiltration membrane, with subsequent cross-linking by glutaraldehyde (GA). The surface properties of the studied membranes have been investigated in detail by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning election microscopy, atomic force microscopy, zeta potential, and water contact angle. The NF performance of the membranes are dependent on the CCh/PEI ratio, co-deposition time and cross-linking condition. Results reveal that the optimum membrane yields a rejection of 88% and a permeation flux of 25 L m −2 h −1 when filtrating the 1000 mg L −1 MgCl2 solution at 0.6 MPa. And the negatively charged membrane surface is related to the following salt rejection sequence: MgSO4 > Na2 SO4 > MgCl2 > CaCl2 > NaCl. Meanwhile, the membranes show excellent operation stability during a 240 h consistent filtration test.