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Article: Tailoring polyamide rejection layer with aqueous carbonate chemistry for enhanced membrane separation: Mechanistic insights, chemistry-structure-property relationship, and environmental implications

TitleTailoring polyamide rejection layer with aqueous carbonate chemistry for enhanced membrane separation: Mechanistic insights, chemistry-structure-property relationship, and environmental implications
Authors
KeywordsAmides
Solution chemistry
Organic polymers
Membranes
Nucleic acid structure
Issue Date2019
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journal/esthag
Citation
Environmental Science & Technology, 2019, v. 53 n. 16, p. 9764-9770 How to Cite?
AbstractSurface roughness and the associated nanosized voids inside the roughness structures have great influence on the separation performance of thin film composite polyamide reverse osmosis (RO) membranes. Inspired by the recent findings that these voids are formed due to the degassing of CO2 nanobubbles during interfacial polymerization, we systematically investigated the role of carbonate chemistry, particularly the solubility of CO2, in the aqueous m-phenylenediamine (MPD) solution for the first time. “Ridge-and-valley” roughness features were obtained when the pH of the MPD solution was between the two acidity constants of the carbonate system (i.e., 6.3 ≤ pH ≤ 10.3), under which condition HCO3– dominates over the other carbonate species. Increasing pH over this range led to both increased water permeability and better rejection of various solutes, thanks to the simultaneously enhanced effective filtration area and cross-linking degree of the polyamide layer. Further increase of pH to 12.5 resulted in more disparate rejection results due to membrane hydrolysis: rejection of neural solutes (B and As(III)) was compromised whereas that of charged solutes (NaCl and As(V)) was maintained. The mechanistic insights gained in the current study reveal the critical need to design RO membranes directly for end applications based on first principles.
Persistent Identifierhttp://hdl.handle.net/10722/285056
ISSN
2023 Impact Factor: 10.8
2023 SCImago Journal Rankings: 3.516
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorPeng, LE-
dc.contributor.authorYao, Z-
dc.contributor.authorLiu, X-
dc.contributor.authorDeng, B-
dc.contributor.authorGuo, H-
dc.contributor.authorTang, CY-
dc.date.accessioned2020-08-07T09:06:09Z-
dc.date.available2020-08-07T09:06:09Z-
dc.date.issued2019-
dc.identifier.citationEnvironmental Science & Technology, 2019, v. 53 n. 16, p. 9764-9770-
dc.identifier.issn0013-936X-
dc.identifier.urihttp://hdl.handle.net/10722/285056-
dc.description.abstractSurface roughness and the associated nanosized voids inside the roughness structures have great influence on the separation performance of thin film composite polyamide reverse osmosis (RO) membranes. Inspired by the recent findings that these voids are formed due to the degassing of CO2 nanobubbles during interfacial polymerization, we systematically investigated the role of carbonate chemistry, particularly the solubility of CO2, in the aqueous m-phenylenediamine (MPD) solution for the first time. “Ridge-and-valley” roughness features were obtained when the pH of the MPD solution was between the two acidity constants of the carbonate system (i.e., 6.3 ≤ pH ≤ 10.3), under which condition HCO3– dominates over the other carbonate species. Increasing pH over this range led to both increased water permeability and better rejection of various solutes, thanks to the simultaneously enhanced effective filtration area and cross-linking degree of the polyamide layer. Further increase of pH to 12.5 resulted in more disparate rejection results due to membrane hydrolysis: rejection of neural solutes (B and As(III)) was compromised whereas that of charged solutes (NaCl and As(V)) was maintained. The mechanistic insights gained in the current study reveal the critical need to design RO membranes directly for end applications based on first principles.-
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/10.1021/acs.est.9b03210-
dc.subjectAmides-
dc.subjectSolution chemistry-
dc.subjectOrganic polymers-
dc.subjectMembranes-
dc.subjectNucleic acid structure-
dc.titleTailoring polyamide rejection layer with aqueous carbonate chemistry for enhanced membrane separation: Mechanistic insights, chemistry-structure-property relationship, and environmental implications-
dc.typeArticle-
dc.identifier.emailGuo, H: guohao7@hku.hk-
dc.identifier.emailTang, CY: tangc@hku.hk-
dc.identifier.authorityTang, CY=rp01765-
dc.description.naturepostprint-
dc.identifier.doi10.1021/acs.est.9b03210-
dc.identifier.pmid31355642-
dc.identifier.scopuseid_2-s2.0-85070864250-
dc.identifier.hkuros312228-
dc.identifier.volume53-
dc.identifier.issue16-
dc.identifier.spage9764-
dc.identifier.epage9770-
dc.identifier.isiWOS:000482521600044-
dc.publisher.placeUnited States-
dc.identifier.issnl0013-936X-

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