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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleNb-containing hematites Fe2-xNbxO3: The role of Nb5+ on the reactivity in presence of the H2O2 or ultraviolet lightpt_BR
dc.contributor.authorSilva, ACpt_BR
dc.contributor.authorOliveira, DQLpt_BR
dc.contributor.authorOliveira, LCApt_BR
dc.contributor.authorAnastacio, ASpt_BR
dc.contributor.authorRamalho, TCpt_BR
dc.contributor.authorLopes, JHpt_BR
dc.contributor.authorCarvalho, HWPpt_BR
dc.contributor.authorTorres, CERpt_BR
unicamp.author.emailluizoliveira@ufla.brpt_BR
unicamp.authorSilva, Adilson C. Oliveira, Diana Q. L. Oliveira, Luiz C. A. Anastacio, Alexandre S. Ramalho, Teodorico C. Univ Fed Lavras, Dept Chem, BR-37200000 Lavras, MG, Brazilpt_BR
unicamp.authorLopes, Joao H. Univ Estadual Campinas, Dept Chem, Campinas, SP, Brazilpt_BR
unicamp.authorCarvalho, Hudson W. P. Univ Estadual Paulista, Dept Phys Chem, BR-14801970 Araraquara, SP, Brazilpt_BR
unicamp.authorTorres, Claudia E. Rodriguez Natl Univ La Plata, Dept Phys, RA-1900 La Plata, Argentinapt_BR
dc.subjectHematitept_BR
dc.subjectNiobiumpt_BR
dc.subjectOrganic oxidationpt_BR
dc.subjectESI-MSpt_BR
dc.subject.wosOrganic Contaminantspt_BR
dc.subject.wosHydrogen-peroxidept_BR
dc.subject.wosWaste-waterpt_BR
dc.subject.wosAzo-dyept_BR
dc.subject.wosOxidationpt_BR
dc.subject.wosDegradationpt_BR
dc.subject.wosCatalystpt_BR
dc.subject.wosSystempt_BR
dc.subject.wosMechanismspt_BR
dc.subject.wosOxidespt_BR
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.pt
dc.relation.ispartofApplied Catalysis A-generalpt_BR
dc.relation.ispartofabbreviationAppl. Catal. A-Gen.pt_BR
dc.publisher.cityAmsterdampt_BR
dc.publisher.countryHolandapt_BR
dc.publisherElsevier Science Bvpt_BR
dc.date.issued2009pt_BR
dc.date.monthofcirculation11383pt_BR
dc.identifier.citationApplied Catalysis A-general. Elsevier Science Bv, v. 357, n. 1, n. 79, n. 84, 2009.pt_BR
dc.language.isoenpt_BR
dc.description.volume357pt_BR
dc.description.issuenumber1pt_BR
dc.description.firstpage79pt_BR
dc.description.lastpage84pt_BR
dc.rightsfechadopt_BR
dc.rights.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policypt_BR
dc.sourceWeb of Sciencept_BR
unicamp.cruespUNESPpt_BR
dc.identifier.issn0926-860Xpt_BR
dc.identifier.wosidWOS:000264558200011pt_BR
dc.identifier.doi10.1016/j.apcata.2009.01.014pt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)pt_BR
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)pt_BR
dc.description.sponsorship1Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)pt_BR
dc.description.sponsorship1Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.date.available2014-11-14T15:36:44Z
dc.date.available2015-11-26T17:15:35Z-
dc.date.accessioned2014-11-14T15:36:44Z
dc.date.accessioned2015-11-26T17:15:35Z-
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dc.description.provenanceMade available in DSpace on 2015-11-26T17:15:35Z (GMT). No. of bitstreams: 2 WOS000264558200011.pdf: 846420 bytes, checksum: b2e18891abf9ad1bdcda1669a43664fc (MD5) WOS000264558200011.pdf.txt: 23459 bytes, checksum: ff7e966ef1f20834b4b7722e2ccc1131 (MD5) Previous issue date: 2009en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/63449pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/63449
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/63449-
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