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Article: Reaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes

TitleReaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodes
Authors
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
Citation
Water Research, 2005, v. 39 n. 10, p. 1972-1981 How to Cite?
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.
Persistent Identifierhttp://hdl.handle.net/10722/48526
ISSN
2014 Impact Factor: 5.528
2014 SCImago Journal Rankings: 2.692
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XYen_HK
dc.contributor.authorCui, YHen_HK
dc.contributor.authorFeng, YJen_HK
dc.contributor.authorXie, ZMen_HK
dc.contributor.authorGu, JDen_HK
dc.date.accessioned2008-05-22T04:16:16Z-
dc.date.available2008-05-22T04:16:16Z-
dc.date.issued2005en_HK
dc.identifier.citationWater Research, 2005, v. 39 n. 10, p. 1972-1981en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/48526-
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.en_HK
dc.format.extent298704 bytes-
dc.format.extent15414 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_HK
dc.relation.ispartofWater Researchen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAnodeen_HK
dc.subjectElectro-oxidationen_HK
dc.subjectElectrochemistryen_HK
dc.subjectFree radicalsen_HK
dc.subjectPhenolen_HK
dc.subjectWastewater treatmenten_HK
dc.titleReaction pathways and mechanisms of the electrochemical degradation of phenol on different electrodesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=39&issue=10&spage=1972&epage=1981&date=2005&atitle=Reaction+pathways+and+mechanisms+of+the+electrochemical+degradation+of+phenol+on+different+electrodesen_HK
dc.identifier.emailLi, XY: xlia@hkucc.hku.hken_HK
dc.identifier.emailGu, JD: jdgu@hkucc.hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.identifier.authorityGu, JD=rp00701en_HK
dc.description.naturepostprinten_HK
dc.identifier.doi10.1016/j.watres.2005.02.021en_HK
dc.identifier.pmid15882890en_HK
dc.identifier.scopuseid_2-s2.0-20344396124en_HK
dc.identifier.hkuros105072-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-20344396124&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume39en_HK
dc.identifier.issue10en_HK
dc.identifier.spage1972en_HK
dc.identifier.epage1981en_HK
dc.identifier.isiWOS:000230241200005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK
dc.identifier.scopusauthoridCui, YH=8963567900en_HK
dc.identifier.scopusauthoridFeng, YJ=7404543985en_HK
dc.identifier.scopusauthoridXie, ZM=36055453500en_HK
dc.identifier.scopusauthoridGu, JD=7403129601en_HK

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