File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Surface modification of nanofiltration membranes to improve the removal of organic micropollutants: Linking membrane characteristics to solute transmission

TitleSurface modification of nanofiltration membranes to improve the removal of organic micropollutants: Linking membrane characteristics to solute transmission
Authors
KeywordsNanofiltration membrane
Surface modification
Organic micropollutants
Solute transport
Issue Date2021
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2021, v. 203, p. article no. 117520 How to Cite?
AbstractSurface modification of nanofiltration (NF) membranes has great potential to improve the removal of organic micropollutants (OMs) by NF membranes. This study used polydopamine (PDA) as a model coating to comprehensively link the changes in membrane properties with the changes in transmission of 34 OMs. The membrane characterization demonstrated that a thicker, denser, and more hydrophilic PDA coating can be achieved by increasing the PDA deposition time from 0.5 to 4 hours. Overall, the transmissions of target OMs were reduced by PDA-coated NF membranes compared to unmodified NF membranes. The neutral hydrophobic compounds showed lower transmissions for longer PDA coating (PDA4), while the neutral hydrophilic compounds tended to show lower transmissions for shorter PDA coating (PDA0.5). To explain this, competing effects provided by the PDA coatings are proposed including sealing defects, inducing cake-enhanced concentration polarization in the coating layer for neutral hydrophilic compounds, and weakened hydrophobic adsorption for neutral hydrophobic compounds. For charged compounds, PDA4 with the greatest negative charge among the PDA-coated membranes showed the lowest transmission. Depending on the molecular size and hydrophilicity of the compounds, the transmission of OMs by the PDA4 coating could be reduced by 70% with only a 26.4% decline in water permeance. The correlations and mechanistic insights provided by this work are highly useful for designing membranes with specific surface properties via surface modification to improve the removal of OMs without compromising water production.
Persistent Identifierhttp://hdl.handle.net/10722/306366
ISSN
2023 Impact Factor: 11.4
2023 SCImago Journal Rankings: 3.596
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHuang, S-
dc.contributor.authorMcDonald, JA-
dc.contributor.authorKuchel, RP-
dc.contributor.authorKhan, SJ-
dc.contributor.authorLeslie, G-
dc.contributor.authorTang, CY-
dc.contributor.authorMansouri, J-
dc.contributor.authorFane, AG-
dc.date.accessioned2021-10-20T10:22:36Z-
dc.date.available2021-10-20T10:22:36Z-
dc.date.issued2021-
dc.identifier.citationWater Research, 2021, v. 203, p. article no. 117520-
dc.identifier.issn0043-1354-
dc.identifier.urihttp://hdl.handle.net/10722/306366-
dc.description.abstractSurface modification of nanofiltration (NF) membranes has great potential to improve the removal of organic micropollutants (OMs) by NF membranes. This study used polydopamine (PDA) as a model coating to comprehensively link the changes in membrane properties with the changes in transmission of 34 OMs. The membrane characterization demonstrated that a thicker, denser, and more hydrophilic PDA coating can be achieved by increasing the PDA deposition time from 0.5 to 4 hours. Overall, the transmissions of target OMs were reduced by PDA-coated NF membranes compared to unmodified NF membranes. The neutral hydrophobic compounds showed lower transmissions for longer PDA coating (PDA4), while the neutral hydrophilic compounds tended to show lower transmissions for shorter PDA coating (PDA0.5). To explain this, competing effects provided by the PDA coatings are proposed including sealing defects, inducing cake-enhanced concentration polarization in the coating layer for neutral hydrophilic compounds, and weakened hydrophobic adsorption for neutral hydrophobic compounds. For charged compounds, PDA4 with the greatest negative charge among the PDA-coated membranes showed the lowest transmission. Depending on the molecular size and hydrophilicity of the compounds, the transmission of OMs by the PDA4 coating could be reduced by 70% with only a 26.4% decline in water permeance. The correlations and mechanistic insights provided by this work are highly useful for designing membranes with specific surface properties via surface modification to improve the removal of OMs without compromising water production.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres-
dc.relation.ispartofWater Research-
dc.subjectNanofiltration membrane-
dc.subjectSurface modification-
dc.subjectOrganic micropollutants-
dc.subjectSolute transport-
dc.titleSurface modification of nanofiltration membranes to improve the removal of organic micropollutants: Linking membrane characteristics to solute transmission-
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.watres.2021.117520-
dc.identifier.pmid34392040-
dc.identifier.scopuseid_2-s2.0-85112460825-
dc.identifier.hkuros326756-
dc.identifier.volume203-
dc.identifier.spagearticle no. 117520-
dc.identifier.epagearticle no. 117520-
dc.identifier.isiWOS:000697761300012-
dc.publisher.placeUnited Kingdom-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats