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Article: Intrinsic nanoscale structure of thin film composite polyamide membranes: Connectivity, defects, and structure-property correlation

TitleIntrinsic nanoscale structure of thin film composite polyamide membranes: Connectivity, defects, and structure-property correlation
Authors
KeywordsThickness
Layers
Structure activity relationship
Membranes
Transmission electron microscopy
Issue Date2020
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/esthag
Citation
Environmental Science & Technology, 2020, v. 54 n. 6, p. 3559-3569 How to Cite?
AbstractTransport of water, solutes, and contaminants through a thin film composite (TFC) membrane is governed by the intrinsic structure of its polyamide separation layer. In this work, we systematically characterized the nanoscale polyamide structure of four commercial TFC membranes to reveal the underlying structure–property relationship. For all the membranes, their polyamide layers have an intrinsic thickness in the range of 10–20 nm, which is an order of magnitude smaller than the more frequently reported apparent thickness of the roughness protuberances due to the ubiquitous presence of nanovoids within the rejection layers. Tracer filtration tests confirmed that these nanovoids are well connected to the pores in the substrates via the honeycomb-like opening of the backside of the polyamide layers such that the actual separation takes place at the frontside of the polyamide layer. Compared to SW30HR and BW30, loose membranes XLE and NF90 have thinner intrinsic thickness and greater effective filtration area (e.g., by the creation of secondary roughness features) for their polyamide layers, which correlates well to their significantly higher water permeability and lower salt rejection. With the aid of scanning electron microscopy, transmission electron microscopy, and tracer tests, the current study reveals the presence of nanosized defects in a polyamide film, which is possibly promoted by excessive interfacial degassing. The presence of such defects not only impairs the salt rejection but also has major implications for the removal of pathogens and micropollutants.
Persistent Identifierhttp://hdl.handle.net/10722/284806
ISSN
2023 Impact Factor: 10.8
2023 SCImago Journal Rankings: 3.516
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSong, X-
dc.contributor.authorGan, B-
dc.contributor.authorQi, S-
dc.contributor.authorGuo, H-
dc.contributor.authorTang, CY-
dc.contributor.authorZhou, Y-
dc.contributor.authorGao, C-
dc.date.accessioned2020-08-07T09:02:52Z-
dc.date.available2020-08-07T09:02:52Z-
dc.date.issued2020-
dc.identifier.citationEnvironmental Science & Technology, 2020, v. 54 n. 6, p. 3559-3569-
dc.identifier.issn0013-936X-
dc.identifier.urihttp://hdl.handle.net/10722/284806-
dc.description.abstractTransport of water, solutes, and contaminants through a thin film composite (TFC) membrane is governed by the intrinsic structure of its polyamide separation layer. In this work, we systematically characterized the nanoscale polyamide structure of four commercial TFC membranes to reveal the underlying structure–property relationship. For all the membranes, their polyamide layers have an intrinsic thickness in the range of 10–20 nm, which is an order of magnitude smaller than the more frequently reported apparent thickness of the roughness protuberances due to the ubiquitous presence of nanovoids within the rejection layers. Tracer filtration tests confirmed that these nanovoids are well connected to the pores in the substrates via the honeycomb-like opening of the backside of the polyamide layers such that the actual separation takes place at the frontside of the polyamide layer. Compared to SW30HR and BW30, loose membranes XLE and NF90 have thinner intrinsic thickness and greater effective filtration area (e.g., by the creation of secondary roughness features) for their polyamide layers, which correlates well to their significantly higher water permeability and lower salt rejection. With the aid of scanning electron microscopy, transmission electron microscopy, and tracer tests, the current study reveals the presence of nanosized defects in a polyamide film, which is possibly promoted by excessive interfacial degassing. The presence of such defects not only impairs the salt rejection but also has major implications for the removal of pathogens and micropollutants.-
dc.languageeng-
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/esthag-
dc.relation.ispartofEnvironmental Science & Technology-
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science & Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/acs.est.9b05892-
dc.subjectThickness-
dc.subjectLayers-
dc.subjectStructure activity relationship-
dc.subjectMembranes-
dc.subjectTransmission electron microscopy-
dc.titleIntrinsic nanoscale structure of thin film composite polyamide membranes: Connectivity, defects, and structure-property correlation-
dc.typeArticle-
dc.identifier.emailGuo, H: guohao7@hku.hk-
dc.identifier.emailTang, CY: tangc@hku.hk-
dc.identifier.authorityGuo, H=rp02772-
dc.identifier.authorityTang, CY=rp01765-
dc.description.naturepostprint-
dc.identifier.doi10.1021/acs.est.9b05892-
dc.identifier.pmid32101410-
dc.identifier.scopuseid_2-s2.0-85081700085-
dc.identifier.hkuros312251-
dc.identifier.volume54-
dc.identifier.issue6-
dc.identifier.spage3559-
dc.identifier.epage3569-
dc.identifier.isiWOS:000526416600051-
dc.publisher.placeUnited States-
dc.identifier.issnl0013-936X-

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