Improvement of the photocatalytic activity of magnetite by Mn-incorporation

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dc.contributor.authorCarvalho, Hudson W. P. [UNESP]
dc.contributor.authorHammer, Peter [UNESP]
dc.contributor.authorPulcinelli, Sandra Helena [UNESP]
dc.contributor.authorSantilli, Celso Valentim [UNESP]
dc.contributor.authorMolina, Eduardo F. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-12-03T13:08:38Z
dc.date.available2014-12-03T13:08:38Z
dc.date.issued2014-02-01
dc.description.abstractMn-incorporated Fe3O4 photocatalysts were prepared by a simple co-precipitation method. Photocatalytic discoloration of Methylene Blue (MB) was used to evaluate the performance of these catalysts. The DSC results have shown that the insertion of Mn into Fe3O4 lattice has increased converting Fe3O4 to gamma-Fe2O3. This is accompanied by a decrease of surface area and of crystallinity, as detected by XRD. The analysis of the chemical environment by XPS has shown that Mn2+ replaces Fe2+ preferentially in the octahedral sites while Mn3+ replaces Fe3+ of inverse spinel sites. The Mn-incorporated samples were significantly more efficient in MB discoloration assisted by UVA irradiation and H2O2. It was also found that ascorbic acid prevents H2O2 decomposition, by scavenging preferentially (OOH)-O-center dot radicals produced at Mn sites. Finally, the results reported here can contribute for a better comprehension of the activity of composite catalysts and the design of efficient systems for discoloration of organic pollutants. (C) 2013 Elsevier B.V. All rights reserved.en
dc.description.affiliationUNESP Univ Estadual Paulista, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP Univ Estadual Paulista, Inst Quim, BR-14800900 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 São Paulo (FAPESP)
dc.format.extent64-69
dc.identifierhttp://dx.doi.org/10.1016/j.mseb.2013.11.008
dc.identifier.citationMaterials Science And Engineering B-advanced Functional Solid-state Materials. Amsterdam: Elsevier Science Bv, v. 181, p. 64-69, 2014.
dc.identifier.doi10.1016/j.mseb.2013.11.008
dc.identifier.issn0921-5107
dc.identifier.lattes6466841023506131
dc.identifier.lattes9971202585286967
dc.identifier.lattes5584298681870865
dc.identifier.orcid0000-0002-8356-8093
dc.identifier.urihttp://hdl.handle.net/11449/111417
dc.identifier.wosWOS:000332445400009
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofMaterials Science and Engineering B: Advanced Functional Solid-state Materials
dc.relation.ispartofjcr3.316
dc.relation.ispartofsjr0,779
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectMagnetite catalysten
dc.subjectManganese dopingen
dc.subjectBonding structureen
dc.subjectPhotocatalytical activityen
dc.subjectColorant degradationen
dc.subjectXPSen
dc.titleImprovement of the photocatalytic activity of magnetite by Mn-incorporationen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes6466841023506131
unesp.author.lattes9971202585286967
unesp.author.lattes5584298681870865[4]
unesp.author.orcid0000-0002-8356-8093[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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