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Article: Superior nanofiltration membranes with gradient cross-linked selective layer fabricated via controlled hydrolysis

TitleSuperior nanofiltration membranes with gradient cross-linked selective layer fabricated via controlled hydrolysis
Authors
KeywordsNanofiltration
Membrane preparation
Hydrolysis
Polyamide
Permeability
Issue Date2020
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci
Citation
Journal of Membrane Science, 2020, v. 604, p. article no. 118067 How to Cite?
AbstractNanofiltration (NF) membranes with both high permeability and salt rejection are in dire need for water treatment. Generally, heat treatment is an essential step for fabricating polyamide NF membranes. Conventional heat treatment in an oven causes membrane pore shrinkage and over cross-linking, which often leads to a severe loss of permeation performance. Herein, we report a single-step method by heat-treating membranes in non-neutral solutions to avoid pore shrinkage and generate graded hydrolysis in membrane selective layer. As confirmed by the XPS result, the polyamide NF membrane fabricated via controlled hydrolysis possesses a gradient cross-linking degree vertically along the membrane surface. This optimal polyamide NF membrane had a superior pure water permeability (PWP) of 27.5 L m−2 h−1 bar−1 and high Na2SO4 rejection of 98.5%. Such controlled hydrolysis approach provides novel strategy for fabricating high performance polyamide membranes.
Persistent Identifierhttp://hdl.handle.net/10722/284803
ISSN
2019 Impact Factor: 7.183
2015 SCImago Journal Rankings: 2.042

 

DC FieldValueLanguage
dc.contributor.authorZhan, ZM-
dc.contributor.authorXu, ZL-
dc.contributor.authorZhu, KK-
dc.contributor.authorXue, SM-
dc.contributor.authorJi, CH-
dc.contributor.authorHuang, BQ-
dc.contributor.authorTang, CY-
dc.contributor.authorTang, YJ-
dc.date.accessioned2020-08-07T09:02:50Z-
dc.date.available2020-08-07T09:02:50Z-
dc.date.issued2020-
dc.identifier.citationJournal of Membrane Science, 2020, v. 604, p. article no. 118067-
dc.identifier.issn0376-7388-
dc.identifier.urihttp://hdl.handle.net/10722/284803-
dc.description.abstractNanofiltration (NF) membranes with both high permeability and salt rejection are in dire need for water treatment. Generally, heat treatment is an essential step for fabricating polyamide NF membranes. Conventional heat treatment in an oven causes membrane pore shrinkage and over cross-linking, which often leads to a severe loss of permeation performance. Herein, we report a single-step method by heat-treating membranes in non-neutral solutions to avoid pore shrinkage and generate graded hydrolysis in membrane selective layer. As confirmed by the XPS result, the polyamide NF membrane fabricated via controlled hydrolysis possesses a gradient cross-linking degree vertically along the membrane surface. This optimal polyamide NF membrane had a superior pure water permeability (PWP) of 27.5 L m−2 h−1 bar−1 and high Na2SO4 rejection of 98.5%. Such controlled hydrolysis approach provides novel strategy for fabricating high performance polyamide membranes.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci-
dc.relation.ispartofJournal of Membrane Science-
dc.subjectNanofiltration-
dc.subjectMembrane preparation-
dc.subjectHydrolysis-
dc.subjectPolyamide-
dc.subjectPermeability-
dc.titleSuperior nanofiltration membranes with gradient cross-linked selective layer fabricated via controlled hydrolysis-
dc.typeArticle-
dc.identifier.emailTang, CY: tangc@hku.hk-
dc.identifier.authorityTang, CY=rp01765-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.memsci.2020.118067-
dc.identifier.scopuseid_2-s2.0-85082410602-
dc.identifier.hkuros312246-
dc.identifier.volume604-
dc.identifier.spagearticle no. 118067-
dc.identifier.epagearticle no. 118067-
dc.publisher.placeNetherlands-

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