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dc.contributor.authorLi, Canen_US
dc.contributor.authorZhao, Yalien_US
dc.contributor.authorLai, Gwo Sungen_US
dc.contributor.authorWang, Rongen_US
dc.identifier.citationLi, C., Zhao, Y., Lai, G. S. & Wang, R. (2022). Investigation of aqueous and organic co-solvents roles in fabricating seawater reverse osmosis membrane. Journal of Membrane Science, 645, 120187-.
dc.description.abstractThe addition of co-solvents in aqueous or organic phases of interfacial polymerization is a feasible strategy to tune the performance of aromatic polyamide (PA) thin-film composite (TFC) membrane for brackish water desalination, however, limited progress has been made in developing co-solvent-tailored seawater reverse osmosis (SWRO) membrane. Herein, SWRO membranes were prepared by adding various types of aqueous and organic co-solvents to reveal their impacts on the formation of the PA crumples. It was found that the aqueous/organic co-solvents affected the solubility parameter distance and interfacial tension between two immiscible phases, facilitating the diamine diffusion rate and resulting in a significant change in PA structure. The PA layer with modulated microstructure and varied surface features such as widened void structure, rougher surface, better wettability, and controlled cross-linking degree can be derived from the high interfacial instability that existed between the co-solvent and initial PA film due to the close mutual affinity. Besides, the additional polyvinyl alcohol coating layer atop the PA membrane successfully further enhanced the membrane selectivity. Overall, the mechanistic insights attained in this study revealed the relationship of diamine diffusion, physicochemical properties of PA layer and membrane separation performance for co-solvent-assisted membrane fabrication to render resultant SWRO membrane with more comparable permselectivity. The optimized TFC-SWRO membranes exhibited pure water permeability of 2.2 and 3.2 L m−2 h−1 bar−1 upon the assistance of aqueous and organic co-solvents, respectively, while maintaining excellent NaCl rejection of approximately 99% under seawater desalination tests.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.description.sponsorshipPublic Utilities Board (PUB)en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2021 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Environmental engineeringen_US
dc.titleInvestigation of aqueous and organic co-solvents roles in fabricating seawater reverse osmosis membraneen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.contributor.researchSingapore Membrane Technology Centreen_US
dc.subject.keywordsInterfacial Polymerizationen_US
dc.description.acknowledgementThis research grant was supported by the Singapore National Research Foundation under its Urban Solutions & Sustainability Program and administered by PUB, Singapore’s National Water Agency (grant number: PUB-1801-0010). The Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University is grateful for the funding support from the Economic Development Board of Singapore.en_US
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