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dc.contributor.authorChong, Jeng Yien_US
dc.contributor.authorWang, Rongen_US
dc.identifier.citationChong, J. Y. & Wang, R. (2019). From micro to nano : polyamide thin film on microfiltration ceramic tubular membranes for nanofiltration. Journal of Membrane Science, 587, 117161-.
dc.description.abstractInterfacial polymerization is an effective technique to synthesize high performance polyamide thin film membranes. However, it is still very challenging to apply this technique on ceramic hollow fibres or tubular membranes, especially when the substrate pore size is in the microfiltration range. In this study, we demonstrated that thin polyamide layer can be synthesized directly on microfiltration ceramic tubular membranes with a surface pore size of 0.1–0.2 μm via interfacial polymerization without an intermediate layer. A thin polyamide layer with a thickness 30–40 nm was coated on the inner surface of the ceramic substrate by circulating the monomers of branched polyethyleneimine (PEI), piperazine (PIP), and trimesoyl chloride (TMC) through the membrane lumen. The thin film layer showed good integration with the ceramic substrate and could withstand high pressure of at least 10 bar. The mechanical property of the polyamide layer was examined using AFM and the modulus was measured. The thin film composite membranes demonstrated excellent nanofiltration performance with a pure water permeability of 16–18 LMH bar−1 and a molecular weight cut-off of ∼250 Da. The membranes also showed good salt rejections (>90%) to CaCl2, MgCl2 and MgSO4, and still maintained high rejections of MgCl2 and sucrose at elevated temperature of 80 °C. The use of highly inert ceramic substrates has enabled the application of polyamide membranes under more challenging conditions.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2019 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.en_US
dc.subjectEngineering::Environmental engineeringen_US
dc.titleFrom micro to nano : polyamide thin film on microfiltration ceramic tubular membranes for nanofiltrationen_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.description.versionAccepted versionen_US
dc.subject.keywordsInterfacial Polymerizationen_US
dc.subject.keywordsPolyamide Thin Filmen_US
dc.description.acknowledgementThe authors gratefully acknowledge the funding support from the Singapore Economic Development Board to the Singapore Membrane Technology Centre.en_US
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