Photocatalytic degradation of methylene blue by TiO2-Cu thin films: Theoretical and experimental study

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dc.contributor.authorCarvalho, Hudson W. P. [UNESP]
dc.contributor.authorBatista, Ana P. L.
dc.contributor.authorHammer, Peter [UNESP]
dc.contributor.authorRamalho, Teodorico C.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de Lavras (UFLA)
dc.date.accessioned2014-05-20T14:18:42Z
dc.date.available2014-05-20T14:18:42Z
dc.date.issued2010-12-15
dc.description.abstractIn this work the effect of doping concentration and depth profile of Cu atoms on the photocatalytic and surface properties of TiO2 films were studied. TiO2 films of about 200 nn thickness were deposited on glass substrates on which a thin Cu layer (5 nm) was deposited. The films were annealed during 1 s to 100 degrees C and 400 degrees C, followed by chemical etching of the Cu film. The grazing incidence X-ray fluorescence measurements showed a thermal induced migration of Cu atoms to depths between 7 and 31 nm. The X-ray photoelectron spectroscopy analysis detected the presence of TiO2, Cu2O and Cu-0 phases and an increasing Cu content with the annealing temperature. The change of the surface properties was monitored by the increasing red-shift and absorption of the ultraviolet-visible spectra. Contact angle measurements revealed the formation of a highly hydrophilic surface for the film having a medium Cu concentration. For this sample photocatalytic assays, performed by methylene blue discoloration, show the highest activity. The proposed mechanism of the catalytic effect, taking place on Ti/Cu sites, is supported by results obtained by theoretical calculations. (C) 2010 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Inst Chem, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUniv São Paulo, Inst Chem, BR-05508000 São Paulo, Brazil
dc.description.affiliationUniversidade Federal de Lavras (UFLA), Dept Chem, BR-37200000 Lavras, MG, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Chem, BR-14801970 Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipLaboratório Nacional de Luz Síncrotron (LNLS)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
dc.description.sponsorshipCAPQ-DQI-UFLA
dc.format.extent273-280
dc.identifierhttp://dx.doi.org/10.1016/j.jhazmat.2010.08.033
dc.identifier.citationJournal of Hazardous Materials. Amsterdam: Elsevier B.V., v. 184, n. 1-3, p. 273-280, 2010.
dc.identifier.doi10.1016/j.jhazmat.2010.08.033
dc.identifier.issn0304-3894
dc.identifier.lattes6466841023506131
dc.identifier.orcid0000-0002-3823-0050
dc.identifier.urihttp://hdl.handle.net/11449/25649
dc.identifier.wosWOS:000284504800037
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Hazardous Materials
dc.relation.ispartofjcr6.434
dc.relation.ispartofsjr1,787
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectPhotocatalysisen
dc.subjectTiO2en
dc.subjectMethylene blueen
dc.subjectCuen
dc.subjectXPSen
dc.titlePhotocatalytic degradation of methylene blue by TiO2-Cu thin films: Theoretical and experimental studyen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes6466841023506131(3)
unesp.author.orcid0000-0002-3823-0050(3)
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Físico Química - IQ