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Article: Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite

TitleDegradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite
Authors
Issue Date2012
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/est
Citation
Environmental Science And Technology, 2012, v. 46 n. 2, p. 852-859 How to Cite?
AbstractThe degradation of polyamide (PA) nanofiltration and reverse osmosis membranes by chlorine needs to be understood in order to develop chlorine-resistant membranes. Coated and uncoated fully aromatic (FA) and piperazine (PIP) semi-aromatic PA membranes were treated with hypochlorite solution and analyzed by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR). XPS results showed that in chlorine treated FA PA membranes the ratio of bound chlorine to surface nitrogen was 1:1 whereas it was only 1:6 in the case of PIP PA membranes. Surface oxygen of uncoated FA and PIP membranes increased with increasing hypochlorite concentration whereas it decreased for coated FA membranes. High resolution XPS data support that chlorination increased the number of carboxylic groups on the PA surface, which appear to form by hydrolysis of the amide bonds (C(O)-N). FTIR data indicated the disappearance of the amide II band (1541 cm -1) and aromatic amide peak (1609 cm -1) in both coated and uncoated chlorinated FA membranes, consistent with the N-chlorination suggested by the XPS results. Furthermore, the surface charge of chlorinated membranes at low pH (<6) became negative, consistent with amide-nitrogen chlorination. Chlorination appeared to both increase and decrease membrane hydrophobicity depending on chlorination exposure conditions, which implied that N-chlorination and hydrolysis may be competing processes. The effects of property changes on the membrane performance were also observed for NF90, BW30, and NF270 membranes. © 2012 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/185414
ISSN
2015 Impact Factor: 5.393
2015 SCImago Journal Rankings: 2.664
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorDo, VTen_US
dc.contributor.authorTang, CYen_US
dc.contributor.authorReinhard, Men_US
dc.contributor.authorLeckie, JOen_US
dc.date.accessioned2013-07-30T07:32:22Z-
dc.date.available2013-07-30T07:32:22Z-
dc.date.issued2012en_US
dc.identifier.citationEnvironmental Science And Technology, 2012, v. 46 n. 2, p. 852-859en_US
dc.identifier.issn0013-936Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/185414-
dc.description.abstractThe degradation of polyamide (PA) nanofiltration and reverse osmosis membranes by chlorine needs to be understood in order to develop chlorine-resistant membranes. Coated and uncoated fully aromatic (FA) and piperazine (PIP) semi-aromatic PA membranes were treated with hypochlorite solution and analyzed by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR). XPS results showed that in chlorine treated FA PA membranes the ratio of bound chlorine to surface nitrogen was 1:1 whereas it was only 1:6 in the case of PIP PA membranes. Surface oxygen of uncoated FA and PIP membranes increased with increasing hypochlorite concentration whereas it decreased for coated FA membranes. High resolution XPS data support that chlorination increased the number of carboxylic groups on the PA surface, which appear to form by hydrolysis of the amide bonds (C(O)-N). FTIR data indicated the disappearance of the amide II band (1541 cm -1) and aromatic amide peak (1609 cm -1) in both coated and uncoated chlorinated FA membranes, consistent with the N-chlorination suggested by the XPS results. Furthermore, the surface charge of chlorinated membranes at low pH (<6) became negative, consistent with amide-nitrogen chlorination. Chlorination appeared to both increase and decrease membrane hydrophobicity depending on chlorination exposure conditions, which implied that N-chlorination and hydrolysis may be competing processes. The effects of property changes on the membrane performance were also observed for NF90, BW30, and NF270 membranes. © 2012 American Chemical Society.en_US
dc.languageengen_US
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/esten_US
dc.relation.ispartofEnvironmental Science and Technologyen_US
dc.subject.meshFiltration - Instrumentation - Methodsen_US
dc.subject.meshHypochlorous Acid - Chemistryen_US
dc.subject.meshMembranes, Artificialen_US
dc.subject.meshMolecular Structureen_US
dc.subject.meshNanostructures - Chemistryen_US
dc.subject.meshNylons - Chemistryen_US
dc.subject.meshOsmosisen_US
dc.titleDegradation of polyamide nanofiltration and reverse osmosis membranes by hypochloriteen_US
dc.typeArticleen_US
dc.identifier.emailTang, CY: tangc@hku.hken_US
dc.identifier.authorityTang, CY=rp01765en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1021/es203090yen_US
dc.identifier.pmid22221176-
dc.identifier.scopuseid_2-s2.0-84855928258en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84855928258&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume46en_US
dc.identifier.issue2en_US
dc.identifier.spage852en_US
dc.identifier.epage859en_US
dc.identifier.isiWOS:000299136200038-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridDo, VT=54897725100en_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US
dc.identifier.scopusauthoridReinhard, M=7102724330en_US
dc.identifier.scopusauthoridLeckie, JO=7006717360en_US

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