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Article: Effects of dissolved oxygen, pH, and anions on the 2,3-dichlorophenol degradation by photocatalytic reaction with anodic TiO2 nanotube films

TitleEffects of dissolved oxygen, pH, and anions on the 2,3-dichlorophenol degradation by photocatalytic reaction with anodic TiO2 nanotube films
Authors
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphere
Citation
Chemosphere, 2008, v. 73 n. 5, p. 805-812 How to Cite?
AbstractIn this study, the highly-ordered TiO2 nanotube (TNT) arrays on titanium sheets were prepared by an anodic oxidation method. Under UV illumination, the TNT films demonstrated the higher photocatalytic activity in terms of 2,3-dichlorophenol (2,3-DCP) degradation in aqueous solution than the conventional TiO2 thin films prepared by a sol-gel method. The effects of dissolved oxygen (DO) and pH on the photocatalytic degradation of 2,3-DCP were investigated. The results showed that the role of DO in the 2,3-DCP degradation with the TNT film was significant. It was found that 2,3-DCP in alkaline solution was degraded and dechlorinated faster than that in acidic solution whereas dissolved organic carbon removal presented an opposite order in dependence of pH. In the meantime, some main intermediate products from 2,3-DCP degradation were identified by a 1H NMR technique to explore a possible degradation pathway. A major intermediate, 2-chlororesorcinol, was identified from the 2,3-DCP decomposition as a new species compared to the findings in previous reports. Photocatalytic deactivation was also evaluated in the presence of individual anions (NO3 -, Cl-, SO4 2 -, and H2 PO4 -). The inhibition degree of photocatalytic degradation of 2,3-DCP caused by these anions can be ranked from high to low as SO4 2 - > Cl- >H2 PO4 - >NO3 - . The observed inhibition effect can be attributed to the competitive adsorption and the formation of less reactive radicals during the photocatalytic reaction. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58410
ISSN
2015 Impact Factor: 3.698
2015 SCImago Journal Rankings: 1.536
ISI Accession Number ID
Funding AgencyGrant Number
The Hong Kong Polytechnic University
Funding Information:

The authors wish to acknowledge the support of the Research Committee of The Hong Kong Polytechnic University in providing a PhD scholarship for H.C. Liang.

References

 

DC FieldValueLanguage
dc.contributor.authorLiang, Hcen_HK
dc.contributor.authorLi, Xzen_HK
dc.contributor.authorYang, Yhen_HK
dc.contributor.authorSze, Khen_HK
dc.date.accessioned2010-05-31T03:29:48Z-
dc.date.available2010-05-31T03:29:48Z-
dc.date.issued2008en_HK
dc.identifier.citationChemosphere, 2008, v. 73 n. 5, p. 805-812en_HK
dc.identifier.issn0045-6535en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58410-
dc.description.abstractIn this study, the highly-ordered TiO2 nanotube (TNT) arrays on titanium sheets were prepared by an anodic oxidation method. Under UV illumination, the TNT films demonstrated the higher photocatalytic activity in terms of 2,3-dichlorophenol (2,3-DCP) degradation in aqueous solution than the conventional TiO2 thin films prepared by a sol-gel method. The effects of dissolved oxygen (DO) and pH on the photocatalytic degradation of 2,3-DCP were investigated. The results showed that the role of DO in the 2,3-DCP degradation with the TNT film was significant. It was found that 2,3-DCP in alkaline solution was degraded and dechlorinated faster than that in acidic solution whereas dissolved organic carbon removal presented an opposite order in dependence of pH. In the meantime, some main intermediate products from 2,3-DCP degradation were identified by a 1H NMR technique to explore a possible degradation pathway. A major intermediate, 2-chlororesorcinol, was identified from the 2,3-DCP decomposition as a new species compared to the findings in previous reports. Photocatalytic deactivation was also evaluated in the presence of individual anions (NO3 -, Cl-, SO4 2 -, and H2 PO4 -). The inhibition degree of photocatalytic degradation of 2,3-DCP caused by these anions can be ranked from high to low as SO4 2 - > Cl- >H2 PO4 - >NO3 - . The observed inhibition effect can be attributed to the competitive adsorption and the formation of less reactive radicals during the photocatalytic reaction. © 2008 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphereen_HK
dc.relation.ispartofChemosphereen_HK
dc.subject.meshAnions - chemistryen_HK
dc.subject.meshCatalysisen_HK
dc.subject.meshChlorophenols - chemistryen_HK
dc.subject.meshHydrogen-Ion Concentrationen_HK
dc.subject.meshNanotubes - chemistryen_HK
dc.subject.meshOxygen - chemistryen_HK
dc.subject.meshPhotochemistryen_HK
dc.subject.meshPhotosensitizing Agents - chemistryen_HK
dc.subject.meshTitanium - chemistryen_HK
dc.titleEffects of dissolved oxygen, pH, and anions on the 2,3-dichlorophenol degradation by photocatalytic reaction with anodic TiO2 nanotube filmsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0045-6535&volume=73&spage=805&epage=812&date=2008&atitle=Effects+of+Dissolved+Oxygen,+pH,+and+Anions+on+the+2,3-Dichlorophenol+Degradation+by+Photocatalytic+Reaction+with+Anodic+TiO2+Nanotube+Filmsen_HK
dc.identifier.emailSze, Kh:khsze@hku.hken_HK
dc.identifier.authoritySze, Kh=rp00785en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.chemosphere.2008.06.007en_HK
dc.identifier.pmid18640697-
dc.identifier.scopuseid_2-s2.0-51349097702en_HK
dc.identifier.hkuros161867en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-51349097702&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume73en_HK
dc.identifier.issue5en_HK
dc.identifier.spage805en_HK
dc.identifier.epage812en_HK
dc.identifier.isiWOS:000260090400025-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLiang, Hc=24468524300en_HK
dc.identifier.scopusauthoridLi, Xz=8046503000en_HK
dc.identifier.scopusauthoridYang, Yh=7409391816en_HK
dc.identifier.scopusauthoridSze, Kh=7006735061en_HK

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