Experimental and theoretical study on the reactivity of maghemite doped with Cu2+ in oxidation reactions: structural and thermodynamic properties towards a Fenton catalyst

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorPires, Maíra dos Santos-
Autor(es): dc.creatorNogueira, Francisco G. E.-
Autor(es): dc.creatorTorres, Juliana A.-
Autor(es): dc.creatorLacerda, Lívia C. T.-
Autor(es): dc.creatorCorrêa, Silviana-
Autor(es): dc.creatorPereira, Márcio C.-
Autor(es): dc.creatorRamalho, Teodorico C.-
Data de aceite: dc.date.accessioned2026-02-09T12:47:38Z-
Data de disponibilização: dc.date.available2026-02-09T12:47:38Z-
Data de envio: dc.date.issued2019-09-26-
Data de envio: dc.date.issued2019-09-26-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/36948-
Fonte completa do material: dc.identifierhttps://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra11032k#!divAbstract-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1168401-
Descrição: dc.descriptionIn this work, a polymeric method was used to prepare undoped and Cu-doped iron oxide catalysts for the H2O2 decomposition reaction. These catalysts were characterized by powder X-ray diffractometry (XRD), scanning electronic microscopy (SEM) coupled to an energy dispersive X-ray spectrometer (EDX), and H2-Temperature Programmed Reduction (H2-TPR). The SEM images show an inhomogeneous particle cluster in both samples, tending to decrease in size with Cu-doping. EDX mapping reveals a good dispersion of Cu2+ in the iron oxide. In addition, Rietveld refinement of the XRD patterns reveals that the samples are constituted of hematite and maghemite, but only maghemite has octahedral Fe3+ ions isomorphically replaced by 2 wt% Cu2+. Cu-doping produces an active catalyst for H2O2 decomposition. Tests using phenol show the strong inhibition of H2O2 decomposition by the Cu-doped catalysts, suggesting that H2O2 may be decomposed via a radical mechanism. Furthermore, phenol degradation kinetics confirm that the doping of maghemite with Cu2+ brings about a significant improvement in catalytic activity. Theoretical calculations reveal that Cu-doping in maghemite produces low electronic density sites, favoring the interactions between the surface oxygens of H2O2 and Cu2+, thus improving the catalytic activity. This strategy can be extended to other materials to design active heterogeneous catalysts for environmental purposes.-
Idioma: dc.languageen-
Publicador: dc.publisherThe Royal Society of Chemistry-
Direitos: dc.rightsrestrictAccess-
???dc.source???: dc.sourceRSC Advances-
Palavras-chave: dc.subjectCu-doped iron oxide catalysts-
Palavras-chave: dc.subjectMaghemite doped-
Palavras-chave: dc.subjectCatalisadores de óxido de ferro dopados com cobre-
Palavras-chave: dc.subjectMagemita dopada-
Título: dc.titleExperimental and theoretical study on the reactivity of maghemite doped with Cu2+ in oxidation reactions: structural and thermodynamic properties towards a Fenton catalyst-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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