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Title: Electrospun polyimide-based thin-film composite membranes for organic solvent nanofiltration
Authors: You, Xiaofei
Chong, Jeng Yi
Goh, Keng Siang
Tian, Miao
Chew, Jia Wei
Wang, Rong
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: You, X., Chong, J. Y., Goh, K. S., Tian, M., Chew, J. W. & Wang, R. (2021). Electrospun polyimide-based thin-film composite membranes for organic solvent nanofiltration. Journal of Membrane Science, 640, 119825-.
Journal: Journal of Membrane Science 
Abstract: Electrospun polymeric membranes are promising substrates for thin-film composite (TFC) membranes due to their unique interconnected pores and high porosity. However, it is still challenging to fabricate desirable electrospun substrates for organic solvent nanofiltration (OSN) owing to the relatively complex processing procedures and the organic operating environment. In this work, solvent-resistant electrospun polyimide (PI) nanofiber substrates were successfully fabricated through electrospinning followed by chemical cross-linking and heat-pressing. The cross-linking step improved the solvent tolerance of the membranes, while the heat-pressing step reduced the substrate pore size and surface roughness. However, it was found that heat-pressing at high temperatures (>140 °C) could degrade the cross-linking of PI, undermining their solvent-resistant property. A polyamide thin film layer was then synthesized on the solvent-resistant electrospun nanofibrous substrates via interfacial polymerization using reactant monomers m-phenylenediamine (MPD) and trimesoyl chloride (TMC). The TFC membranes exhibited excellent acetonitrile and acetone permeabilities of 31.28 ± 1.93 and 26.58 ± 1.13 L m−2 h−1 bar−1, respectively, with acid fuchsin (585 Da) and methyl orange (327 Da) rejections of 98.55 ± 1.24% and 92.42 ± 1.66%, respectively, in acetone. This study successfully demonstrated the potential use of electrospun PI nanofibers substrates for TFC membranes in OSN.
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2021.119825
Rights: © 2021 Elsevier B.V. All rights reserved. This paper was published in Journal of Membrane Science and is made available with permission of Elsevier B.V.
Fulltext Permission: embargo_20231222
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
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