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dc.creatorPires, Maíra dos Santos-
dc.creatorNogueira, Francisco G. E.-
dc.creatorTorres, Juliana A.-
dc.creatorLacerda, Lívia C. T.-
dc.creatorCorrêa, Silviana-
dc.creatorPereira, Márcio C.-
dc.creatorRamalho, Teodorico C.-
dc.date.accessioned2019-09-26T12:42:29Z-
dc.date.available2019-09-26T12:42:29Z-
dc.identifier.citationPIRES, M. dos S. et al. Experimental and theoretical study on the reactivity of maghemite doped with Cu2+ in oxidation reactions: structural and thermodynamic properties towards a Fenton catalyst. RSC Advances, [S. l.], v. 6, n. 84, p. 80830-80839, 2016. DOI: 10.1039/C6RA11032K.pt_BR
dc.identifier.urihttps://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra11032k#!divAbstractpt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/36948-
dc.description.abstractIn 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.pt_BR
dc.languageen_USpt_BR
dc.publisherThe Royal Society of Chemistrypt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceRSC Advancespt_BR
dc.subjectCu-doped iron oxide catalystspt_BR
dc.subjectMaghemite dopedpt_BR
dc.subjectCatalisadores de óxido de ferro dopados com cobrept_BR
dc.subjectMagemita dopadapt_BR
dc.titleExperimental and theoretical study on the reactivity of maghemite doped with Cu2+ in oxidation reactions: structural and thermodynamic properties towards a Fenton catalystpt_BR
dc.typeArtigopt_BR
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