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Title: Robust polyamide-PTFE hollow fibre membranes for harsh organic solvent nanofiltration
Authors: Francis, Verona Nithya
Chong, Jeng Yi
Yang, Guoying
Che, Lei
Wang, Rong
Keywords: Engineering::Environmental engineering
Issue Date: 2023
Source: Francis, V. N., Chong, J. Y., Yang, G., Che, L. & Wang, R. (2023). Robust polyamide-PTFE hollow fibre membranes for harsh organic solvent nanofiltration. Chemical Engineering Journal, 452(Part 2), 139333-.
Journal: Chemical Engineering Journal 
Abstract: Polymeric membranes have been extensively studied for organic solvent nanofiltration (OSN) but many fail to show sufficient chemical resistance in strong solvents like dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). This study focuses on harnessing the outstanding chemical resistance of polytetrafluoroethylene (PTFE), to develop polyamide-PTFE thin film composite (TFC) membranes that are resistant to such aprotic solvents. A defect-free polyamide thin film layer was successfully synthesized on the microfiltration PTFE hollow fibre substrates, overcoming challenges such as large and uneven pore size, and hydrophobicity of the PTFE substrates. A simple polydopamine (PDA) coating was carried out to improve the substrate's hydrophilicity prior to the polyamide synthesis via interfacial polymerization (IP). Polyethyleneimine (PEI) and trimesoyl chloride (TMC) were used as the monomers and a two-time IP method was employed to obtain a defect-free polyamide coating. The synthesized membranes showed high acetonitrile (ACN) and DMF permeabilities of 7.94 and 3.70 lm−2h−1bar−1, respectively, with acid fuchsin (585 Da) rejections of > 90 %. The molecular weight cut-off (MWCO) of the membranes could be further reduced to ∼300 Da by the addition of piperazine (PIP) monomers. The membranes also showed excellent stability and performance in a 72-hour OSN test performed in DMF indicating their great potential in effective molecular separation in harsh solvents. This study demonstrates how a simple modification and coating technique can transform commercially available microfiltration PTFE hollow fibres into durable and high value OSN membranes.
ISSN: 1385-8947
DOI: 10.1016/j.cej.2022.139333
Schools: School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Singapore Membrane Technology Centre 
Rights: © 2022 Elsevier B.V. All rights reserved. This paper was published in Chemical Engineering Journal and is made available with permission of Elsevier B.V.
Fulltext Permission: embargo_20250122
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
NEWRI Journal Articles

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