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Article: Reaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes
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TitleReaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes
 
AuthorsLi, XY1
Cui, YH2
Feng, YJ2
Xie, ZM1
Gu, JD1
 
KeywordsAnode
Electro-oxidation
Electrochemistry
Free radicals
Phenol
Wastewater treatment
 
Issue Date2005
 
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
 
CitationWater Research, 2005, v. 39 n. 10, p. 1972-1981 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.watres.2005.02.021
 
AbstractLaboratory experiments were carried out on the kinetics and pathways of the electrochemical (EC) degradation of phenol at three different types of anodes, Ti/SnO2-Sb, Ti/RuO2, and Pt. Although phenol was oxidised by all of the anodes at a current density of 20 mA/cm2 or a cell voltage of 4.6 V, there was a considerable difference between the three anode types in the effectiveness and performance of EC organic degradation. Phenol was readily mineralized at the Ti/SnO2-Sb anode, but its degradation was much slower at the Ti/RuO2 and Pt anodes. The analytical results of high-performance liquid chromatography (HPLC) and gas chromatography coupled with mass spectrometry (GC/MS) indicated that the intermediate products of EC phenol degradation, including benzoquinone and organic acids, were subsequently oxidised rapidly by the Ti/SnO2-Sb anode, but accumulated in the cells of Ti/RuO2 and Pt. There was also a formation of dark-coloured polymeric compounds and precipitates in the solutions electrolyzed by the Ti/RuO2 and Pt anodes, which was not observed for the Ti/SnO 2-Sb cells. It is argued that anodic property not only affects the reaction kinetics of various steps of EC organic oxidation, but also alters the pathway of phenol electrolysis. Favourable surface treatment, such as the SnO2-Sb coating, provides the anode with an apparent catalytic function for rapid organic oxidation that is probably brought about by hydroxyl radicals generated from anodic water electrolysis. © 2005 Elsevier Ltd. All rights reserved.
 
ISSN0043-1354
2013 Impact Factor: 5.323
2013 SCImago Journal Rankings: 3.026
 
DOIhttp://dx.doi.org/10.1016/j.watres.2005.02.021
 
ISI Accession Number IDWOS:000230241200005
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorLi, XY
 
dc.contributor.authorCui, YH
 
dc.contributor.authorFeng, YJ
 
dc.contributor.authorXie, ZM
 
dc.contributor.authorGu, JD
 
dc.date.accessioned2008-05-22T04:16:16Z
 
dc.date.available2008-05-22T04:16:16Z
 
dc.date.issued2005
 
dc.description.abstractLaboratory experiments were carried out on the kinetics and pathways of the electrochemical (EC) degradation of phenol at three different types of anodes, Ti/SnO2-Sb, Ti/RuO2, and Pt. Although phenol was oxidised by all of the anodes at a current density of 20 mA/cm2 or a cell voltage of 4.6 V, there was a considerable difference between the three anode types in the effectiveness and performance of EC organic degradation. Phenol was readily mineralized at the Ti/SnO2-Sb anode, but its degradation was much slower at the Ti/RuO2 and Pt anodes. The analytical results of high-performance liquid chromatography (HPLC) and gas chromatography coupled with mass spectrometry (GC/MS) indicated that the intermediate products of EC phenol degradation, including benzoquinone and organic acids, were subsequently oxidised rapidly by the Ti/SnO2-Sb anode, but accumulated in the cells of Ti/RuO2 and Pt. There was also a formation of dark-coloured polymeric compounds and precipitates in the solutions electrolyzed by the Ti/RuO2 and Pt anodes, which was not observed for the Ti/SnO 2-Sb cells. It is argued that anodic property not only affects the reaction kinetics of various steps of EC organic oxidation, but also alters the pathway of phenol electrolysis. Favourable surface treatment, such as the SnO2-Sb coating, provides the anode with an apparent catalytic function for rapid organic oxidation that is probably brought about by hydroxyl radicals generated from anodic water electrolysis. © 2005 Elsevier Ltd. All rights reserved.
 
dc.description.naturepostprint
 
dc.format.extent298704 bytes
 
dc.format.extent15414 bytes
 
dc.format.mimetypeapplication/pdf
 
dc.format.mimetypeapplication/pdf
 
dc.identifier.citationWater Research, 2005, v. 39 n. 10, p. 1972-1981 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.watres.2005.02.021
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.watres.2005.02.021
 
dc.identifier.epage1981
 
dc.identifier.hkuros105072
 
dc.identifier.isiWOS:000230241200005
 
dc.identifier.issn0043-1354
2013 Impact Factor: 5.323
2013 SCImago Journal Rankings: 3.026
 
dc.identifier.issue10
 
dc.identifier.openurl
 
dc.identifier.pmid15882890
 
dc.identifier.scopuseid_2-s2.0-20344396124
 
dc.identifier.spage1972
 
dc.identifier.urihttp://hdl.handle.net/10722/48526
 
dc.identifier.volume39
 
dc.languageeng
 
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofWater Research
 
dc.relation.referencesReferences in Scopus
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.subjectAnode
 
dc.subjectElectro-oxidation
 
dc.subjectElectrochemistry
 
dc.subjectFree radicals
 
dc.subjectPhenol
 
dc.subjectWastewater treatment
 
dc.titleReaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes
 
dc.typeArticle
 
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Author Affiliations
  1. The University of Hong Kong
  2. Harbin Institute of Technology