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Nb-containing hematites Fe2-xNbxO3: The role of Nb5+ on the reactivity in presence of the H2O2 or ultraviolet light

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dc.contributor.authorSilva, Adilson C.
dc.contributor.authorOliveira, Diana Q. L.
dc.contributor.authorOliveira, Luiz C. A.
dc.contributor.authorAnastacio, Alexandre S.
dc.contributor.authorRamalho, Teodorico C.
dc.contributor.authorLopes, Joao H.
dc.contributor.authorCarvalho, Hudson W. P. [UNESP]
dc.contributor.authorTorres, Claudia E. Rodriguez
dc.contributor.institutionUniversidade Federal de Lavras (UFLA)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionNatl Univ La Plata
dc.date.accessioned2014-05-20T14:18:28Z
dc.date.available2014-05-20T14:18:28Z
dc.date.issued2009-03-31
dc.description.abstractA series of Nb-containing hematites, Fe-2-xNbxO3 (%Nb = 0.00, 1.49, 5.00 and 9.24) was prepared using the conventional co-precipitation method. Mossbauer and temperature-programmed reduction (TPR) measurements suggested the formation of the crystalline phase with partial substitution of Fe3+ by Nb5+ in the structure. N-2 adsorption/desorption revealed that the presence of Nb has a remarkable effect on the textural properties of the material with an increase in the BET surface area. The reactivity of Fe2-xNbxO3 was investigated using the oxidation of the methylene blue dye used as a model pollutant. The obtained results showed that the presence of Nb seems not to act directly promoting the H2O2 decomposition, but improving the dye oxidation. The analysis using the ESI-MS technique showed partial oxidation observed through different intermediates before the mineralization. This suggests the use of Nb-doped hematite as an efficient catalyst in degradation reactions in the presence of H2O2 or ultraviolet light. (C) 2009 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniversidade Federal de Lavras (UFLA), Dept Chem, BR-37200000 Lavras, MG, Brazil
dc.description.affiliationUniv Estadual Campinas, Dept Chem, Campinas, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Phys Chem, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationNatl Univ La Plata, Dept Phys, RA-1900 La Plata, Argentina
dc.description.affiliationUnespUniv Estadual Paulista, Dept Phys Chem, BR-14801970 Araraquara, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
dc.format.extent79-84
dc.identifierhttp://dx.doi.org/10.1016/j.apcata.2009.01.014
dc.identifier.citationApplied Catalysis A-general. Amsterdam: Elsevier B.V., v. 357, n. 1, p. 79-84, 2009.
dc.identifier.doi10.1016/j.apcata.2009.01.014
dc.identifier.issn0926-860X
dc.identifier.urihttp://hdl.handle.net/11449/25562
dc.identifier.wosWOS:000264558200011
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofApplied Catalysis A: General
dc.relation.ispartofjcr4.521
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectHematiteen
dc.subjectNiobiumen
dc.subjectOrganic oxidationen
dc.subjectESI-MSen
dc.titleNb-containing hematites Fe2-xNbxO3: The role of Nb5+ on the reactivity in presence of the H2O2 or ultraviolet lighten
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dspace.entity.typePublication
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentFísico-Química - IQARpt

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