Titanate nanotubes produced from microwave-assisted hydrothermal synthesis: Photocatalytic and structural properties

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dc.contributor.authorManfroi, Daniela C. [UNESP]
dc.contributor.authorAnjos, Ademir dos
dc.contributor.authorCavalheiro, Alberto A.
dc.contributor.authorPerazolli, Leinig A. [UNESP]
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.authorZaghete, Maria A. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionCtr Pesquisa & Tecnol Recursos Nat CPTREN
dc.date.accessioned2015-03-18T15:53:22Z
dc.date.available2015-03-18T15:53:22Z
dc.date.issued2014-11-01
dc.description.abstractTitanate nanotubes were successfully synthesized using the microwave-assisted hydrothermal method from commercial TiO2-anatase powder. Several samples were obtained at varying temperatures and time. Powder samples containing titanate nanotube (Na2Ti6O13) single phase were obtained at 130 degrees C for 4 h and 150 degrees C for 2 h, demonstrating the kinetics dependence of reaction temperature. Through XRD analysis and electron diffraction pattern, the nanotube structures were found to be composed of a short range ordering, thus giving rise to a broad XRD peak profile. The higher time and temperature (150 degrees C for 4 h) led to the formation of more organized structures. The nanotubes UV-vis spectra showed a band gap of 3.90 eV and a shoulder on the curve which led to another band gap value 3.25 eV. The photoluminescence spectrum emission peak presented a significant decrease, indicating the reduction of surface or structural defects of titanate nanotubes due to longer hydrothermal treatment duration. All structural, electronics and morphologics transformation led to an improvement on photocatalytic activities for nanotubes, especially the sample obtained at 150 degrees C for 1 h that rate of decolorization is 0.01879 min(-1), 2.25 times faster than TiO2-anatase (starting phase). (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.en
dc.description.affiliationUNESP, Inst Quim, Ctr Multidisciplinar Desenvolvimento Mat Ceram, BR-14801907 Araraquara, SP, Brazil
dc.description.affiliationCtr Pesquisa & Tecnol Recursos Nat CPTREN, BR-79950000 Navirai, MS, Brazil
dc.description.affiliationUnespUNESP, Inst Quim, Ctr Multidisciplinar Desenvolvimento Mat Ceram, BR-14801907 Araraquara, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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.sponsorshipIdFAPESP: 13/07296-2
dc.description.sponsorshipIdCNPq: 482943/2012-2
dc.format.extent14483-14491
dc.identifierhttp://dx.doi.org/10.1016/j.ceramint.2014.07.007
dc.identifier.citationCeramics International. Oxford: Elsevier Sci Ltd, v. 40, n. 9, p. 14483-14491, 2014.
dc.identifier.doi10.1016/j.ceramint.2014.07.007
dc.identifier.issn0272-8842
dc.identifier.urihttp://hdl.handle.net/11449/116472
dc.identifier.wosWOS:000341463500092
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofCeramics International
dc.relation.ispartofjcr3.057
dc.relation.ispartofsjr0,784
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectMicrowave hydrotermal synthesisen
dc.subjectTitanate nanotubesen
dc.subjectPhotoluminescenceen
dc.subjectPhotocatalysisen
dc.titleTitanate nanotubes produced from microwave-assisted hydrothermal synthesis: Photocatalytic and structural propertiesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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