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- Publisher Website: 10.1021/es203090y
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- PMID: 22221176
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Article: Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite
Title | Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite |
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Authors | |
Issue Date | 2012 |
Publisher | American 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? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/185414 |
ISSN | 2023 Impact Factor: 10.8 2023 SCImago Journal Rankings: 3.516 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Do, VT | en_US |
dc.contributor.author | Tang, CY | en_US |
dc.contributor.author | Reinhard, M | en_US |
dc.contributor.author | Leckie, JO | en_US |
dc.date.accessioned | 2013-07-30T07:32:22Z | - |
dc.date.available | 2013-07-30T07:32:22Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.citation | Environmental Science And Technology, 2012, v. 46 n. 2, p. 852-859 | en_US |
dc.identifier.issn | 0013-936X | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/185414 | - |
dc.description.abstract | The 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.language | eng | en_US |
dc.publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/est | en_US |
dc.relation.ispartof | Environmental Science and Technology | en_US |
dc.subject.mesh | Filtration - Instrumentation - Methods | en_US |
dc.subject.mesh | Hypochlorous Acid - Chemistry | en_US |
dc.subject.mesh | Membranes, Artificial | en_US |
dc.subject.mesh | Molecular Structure | en_US |
dc.subject.mesh | Nanostructures - Chemistry | en_US |
dc.subject.mesh | Nylons - Chemistry | en_US |
dc.subject.mesh | Osmosis | en_US |
dc.title | Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite | en_US |
dc.type | Article | en_US |
dc.identifier.email | Tang, CY: tangc@hku.hk | en_US |
dc.identifier.authority | Tang, CY=rp01765 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1021/es203090y | en_US |
dc.identifier.pmid | 22221176 | - |
dc.identifier.scopus | eid_2-s2.0-84855928258 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-84855928258&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 46 | en_US |
dc.identifier.issue | 2 | en_US |
dc.identifier.spage | 852 | en_US |
dc.identifier.epage | 859 | en_US |
dc.identifier.isi | WOS:000299136200038 | - |
dc.publisher.place | United States | en_US |
dc.identifier.scopusauthorid | Do, VT=54897725100 | en_US |
dc.identifier.scopusauthorid | Tang, CY=35489259800 | en_US |
dc.identifier.scopusauthorid | Reinhard, M=7102724330 | en_US |
dc.identifier.scopusauthorid | Leckie, JO=7006717360 | en_US |
dc.identifier.issnl | 0013-936X | - |