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Article: Sustaining fouling resistant membranes: Membrane fabrication, characterization and mechanism understanding of demulsification and fouling-resistance

TitleSustaining fouling resistant membranes: Membrane fabrication, characterization and mechanism understanding of demulsification and fouling-resistance
Authors
KeywordsSuperhydrophilicity
Antifouling
Polydopamine
Nanofibrous membrane
Oil/water separation
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci
Citation
Journal of Membrane Science, 2019, v. 581, p. 105-113 How to Cite?
AbstractAntifouling performance of membranes is the key obstacle limiting their practical applications for oil/water separation. In this study, a sustaining antifouling membrane was fabricated by constructing polydopamine (PDA) micro-/nano-spheres on a polyacrylonitrile (PAN) nanofibrous membrane. The secondary PDA nano-spheres not only strengthened the bonding of primary micro-spheres with the substrate, but also diversified the hierarchical structure and chemistry. The composite showed enhanced superhydrophilicity and underwater superoleophobicity. Permeability of PAN-PDAc membrane was maintained as high as 11666 ± 978 Lm−2h−1bar−1 with separation efficiency of higher than 99.9% over a 2-h continuous filtration. This permeability was about 2.7 times of pristine PAN membrane (4260 ± 430 Lm−2h−1bar−1). The extrusion and cutting demulsification on the confined space of PAN-PDA surface was proposed. Antifouling mechanism of the superhydrophilic membrane was first theoretically elucidated based on hydration ability and adhesion free energy with recourse to thermal analysis and Derjaguin-Landau-Verwey-Overbeek theory respectively. It was found that PDA micro-/nano-spheres mediated membrane showed strong hydration ability (higher fraction of non-freezable water) and weak adhesion towards toluene (low free energy of adhesion) compared to pristine PAN membrane. These findings would lead to a better understanding of antifouling demulsification mechanism and improved design of sustaining antifouling membranes for oil/water separation.
Persistent Identifierhttp://hdl.handle.net/10722/272855
ISSN
2019 Impact Factor: 7.183
2015 SCImago Journal Rankings: 2.042
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHe, B-
dc.contributor.authorDing, Y-
dc.contributor.authorWang, J-
dc.contributor.authorYao, Z-
dc.contributor.authorQing, W-
dc.contributor.authorZhang, Y-
dc.contributor.authorLiu, F-
dc.contributor.authorTang, C-
dc.date.accessioned2019-08-06T09:17:51Z-
dc.date.available2019-08-06T09:17:51Z-
dc.date.issued2019-
dc.identifier.citationJournal of Membrane Science, 2019, v. 581, p. 105-113-
dc.identifier.issn0376-7388-
dc.identifier.urihttp://hdl.handle.net/10722/272855-
dc.description.abstractAntifouling performance of membranes is the key obstacle limiting their practical applications for oil/water separation. In this study, a sustaining antifouling membrane was fabricated by constructing polydopamine (PDA) micro-/nano-spheres on a polyacrylonitrile (PAN) nanofibrous membrane. The secondary PDA nano-spheres not only strengthened the bonding of primary micro-spheres with the substrate, but also diversified the hierarchical structure and chemistry. The composite showed enhanced superhydrophilicity and underwater superoleophobicity. Permeability of PAN-PDAc membrane was maintained as high as 11666 ± 978 Lm−2h−1bar−1 with separation efficiency of higher than 99.9% over a 2-h continuous filtration. This permeability was about 2.7 times of pristine PAN membrane (4260 ± 430 Lm−2h−1bar−1). The extrusion and cutting demulsification on the confined space of PAN-PDA surface was proposed. Antifouling mechanism of the superhydrophilic membrane was first theoretically elucidated based on hydration ability and adhesion free energy with recourse to thermal analysis and Derjaguin-Landau-Verwey-Overbeek theory respectively. It was found that PDA micro-/nano-spheres mediated membrane showed strong hydration ability (higher fraction of non-freezable water) and weak adhesion towards toluene (low free energy of adhesion) compared to pristine PAN membrane. These findings would lead to a better understanding of antifouling demulsification mechanism and improved design of sustaining antifouling membranes for oil/water separation.-
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.subjectSuperhydrophilicity-
dc.subjectAntifouling-
dc.subjectPolydopamine-
dc.subjectNanofibrous membrane-
dc.subjectOil/water separation-
dc.titleSustaining fouling resistant membranes: Membrane fabrication, characterization and mechanism understanding of demulsification and fouling-resistance-
dc.typeArticle-
dc.identifier.emailTang, C: tangc@hku.hk-
dc.identifier.authorityTang, C=rp01765-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.memsci.2019.03.045-
dc.identifier.scopuseid_2-s2.0-85063322651-
dc.identifier.hkuros299797-
dc.identifier.volume581-
dc.identifier.spage105-
dc.identifier.epage113-
dc.identifier.isiWOS:000464546200011-
dc.publisher.placeNetherlands-
dc.identifier.issnl0376-7388-

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