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Article: Comparison of the degradations of diphenamid by homogeneous photolysis and heterogeneous photocatalysis in aqueous solution

TitleComparison of the degradations of diphenamid by homogeneous photolysis and heterogeneous photocatalysis in aqueous solution
Authors
Issue Date2010
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphere
Citation
Chemosphere, 2010, v. 80 n. 4, p. 366-374 How to Cite?
AbstractIn this work, the homogeneous and heterogeneous degradations of diphenamid (DPA) in aqueous solution were conducted by direct photolysis with UVC (254nm) and by photocatalysis with TiO2/UVA (350nm), and the experimental results were compared. It was found that the homogeneous photolysis by UVC irradiation alone was quite efficient to degrade DPA up to 100% after 360min, but was very inefficient to mineralize its intermediates in terms of dissolved organic carbon reduction of only 8%. In contrast, the heterogeneous photocatalysis with TiO2/UVA showed relatively a lower degree of DPA degradation (51%), but a higher degree of its mineralization (11%) after 360min. These results reveal that the photocatalysis process has relatively poor selectivity to degrade different compounds including various intermediates from the DPA degradation, which is beneficial to its mineralization. In addition, over 20 intermediates were identified by LC-MS and 1H NMR analyses. Based on the identified intermediates, the reaction mechanisms and the detailed pathways of the DPA degradation by photolysis and photocatalysis were proposed, and are presented in this paper. © 2010 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/157590
ISSN
2015 Impact Factor: 3.698
2015 SCImago Journal Rankings: 1.536
ISI Accession Number ID
Funding AgencyGrant Number
Research Committee of 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 Ph.D. Scholarship for H.C. Liang.

References

 

DC FieldValueLanguage
dc.contributor.authorLiang, HCen_US
dc.contributor.authorLi, XZen_US
dc.contributor.authorYang, YHen_US
dc.contributor.authorSze, KHen_US
dc.date.accessioned2012-08-08T08:51:31Z-
dc.date.available2012-08-08T08:51:31Z-
dc.date.issued2010en_US
dc.identifier.citationChemosphere, 2010, v. 80 n. 4, p. 366-374en_US
dc.identifier.issn0045-6535en_US
dc.identifier.urihttp://hdl.handle.net/10722/157590-
dc.description.abstractIn this work, the homogeneous and heterogeneous degradations of diphenamid (DPA) in aqueous solution were conducted by direct photolysis with UVC (254nm) and by photocatalysis with TiO2/UVA (350nm), and the experimental results were compared. It was found that the homogeneous photolysis by UVC irradiation alone was quite efficient to degrade DPA up to 100% after 360min, but was very inefficient to mineralize its intermediates in terms of dissolved organic carbon reduction of only 8%. In contrast, the heterogeneous photocatalysis with TiO2/UVA showed relatively a lower degree of DPA degradation (51%), but a higher degree of its mineralization (11%) after 360min. These results reveal that the photocatalysis process has relatively poor selectivity to degrade different compounds including various intermediates from the DPA degradation, which is beneficial to its mineralization. In addition, over 20 intermediates were identified by LC-MS and 1H NMR analyses. Based on the identified intermediates, the reaction mechanisms and the detailed pathways of the DPA degradation by photolysis and photocatalysis were proposed, and are presented in this paper. © 2010 Elsevier Ltd.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphereen_US
dc.relation.ispartofChemosphereen_US
dc.subject.meshCatalysisen_US
dc.subject.meshDiphenylacetic Acids - Chemistry - Radiation Effectsen_US
dc.subject.meshEnvironmental Remediationen_US
dc.subject.meshPhotolysisen_US
dc.subject.meshTitanium - Chemistryen_US
dc.subject.meshUltraviolet Raysen_US
dc.subject.meshWater - Chemistryen_US
dc.subject.meshWater Pollutants, Chemical - Chemistry - Radiation Effectsen_US
dc.titleComparison of the degradations of diphenamid by homogeneous photolysis and heterogeneous photocatalysis in aqueous solutionen_US
dc.typeArticleen_US
dc.identifier.emailSze, KH:khsze@hku.hken_US
dc.identifier.authoritySze, KH=rp00785en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.chemosphere.2010.04.054en_US
dc.identifier.pmid20494398-
dc.identifier.scopuseid_2-s2.0-77953612518en_US
dc.identifier.hkuros173295-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77953612518&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume80en_US
dc.identifier.issue4en_US
dc.identifier.spage366en_US
dc.identifier.epage374en_US
dc.identifier.isiWOS:000279447400002-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLiang, HC=24468524300en_US
dc.identifier.scopusauthoridLi, XZ=8046503000en_US
dc.identifier.scopusauthoridYang, YH=7409391816en_US
dc.identifier.scopusauthoridSze, KH=7006735061en_US
dc.identifier.citeulike7267279-

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