Please use this identifier to cite or link to this item: http://www.repositorio.cdtn.br:8080/jspui/handle/123456789/1281
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dc.contributor.authorCunha, Igor T.-
dc.contributor.authorTeixeira, Ivo F.-
dc.contributor.authorMesquita, João Paulo de-
dc.contributor.authorArdisson, José Domingos-
dc.contributor.authorBinatti, Ildefonso Ildefonso-
dc.contributor.authorPereira, Fabiano Vargas-
dc.contributor.authorLago, Rochel Montero-
dc.date.accessioned2018-02-06T11:36:19Z-
dc.date.available2018-02-06T11:36:19Z-
dc.date.issued2016-
dc.identifier.citationCunha, I.T., Teixeira, I.F., Mesquita, J.P., Ardisson, J.D., Binatti, I., Pereira, F.V., Lago, R.M. Cellulose nanocrystals assembled on the Fe3O4surface as precursor to prepare interfaced C/Fe3O4composites for the oxidation of aqueous sulfde Journal of the Brazilian Chemical Society, v.27, n.2, pp. 363-371, 2016.pt_BR
dc.identifier.issn01035053pt_BR
dc.identifier.urihttp://www.repositorio.cdtn.br:8080/jspui/handle/123456789/1281-
dc.description.abstractIn this work, composites based on carbon (1, 10 and 20 wt.%) interfaced with Fe3O4 (magnetite) have been studied as catalysts for the oxidation of aqueous sulfde. The composites were prepared by assembling cellulose nanocrystals surrounding Fe3O4 followed by a controlled thermal decomposition at 400, 600 and 800 °C. Mössbauer, X-ray diffractometry (XRD), Raman, thermogravimetry (TG), elemental analysis CHN, scanning electron microscopy (SEM/EDS), Fourier transform infrared spectroscopy (FTIR) and potentiometric titration indicated that at 400 and 600 °C the cellulose nanocrystals decompose to different carbon forms, i.e., flms, flaments and particles attached to the Fe3O4 crystals. At higher temperature, i.e., 800 °C, this carbon on the magnetite surface further reacted to produce Fe0. UV-Vis, Raman and electrospray ionization mass spectrometry (ESI-MS) measurements showed that these composites catalyze the oxidation of aqueous sulfde to convert S2- aq to polysulfdes Sn 2- (where n = 2-9) and also oxygen containing polysulfdes HOSn -. Simple kinetic experiments showed very low sulfde oxidation activities for pure Fe3O4 and pure carbon. On the other hand, the composites, especially with 10% C obtained at 600 °C, were remarkably active. These results are discussed in terms of a possible participation of oxygen based redox groups present on the carbon surface and an electron transfer from the carbon to the Fe3O4 phase.pt_BR
dc.format.extent363-371pt_BR
dc.language.isoen_USpt_BR
dc.rightsLpt_BR
dc.subjectCellulosept_BR
dc.subjectMicroscopypt_BR
dc.subjectNanostructurept_BR
dc.titleCellulose nanocrystals assembled on the Fe3O4 surface as precursor to prepare interfaced C/Fe3O4 composites for the oxidation of aqueous sulfdept_BR
dc.typeArtigo Periódicopt_BR
dc.coverageIpt_BR
dc.creator.affiliationUniversidade Federal de Minas Gerais, UFMG, Belo Horizonte, MG, Brasilpt_BR
dc.creator.affiliationUniversity of Oxford, Oxford, United Kingdompt_BR
dc.creator.affiliationUniversidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brasilpt_BR
dc.creator.affiliationCentro de Desenvolvimento da Tecnologia Nuclear, CDTN, Belo Horizonte, MG, Brasilpt_BR
dc.creator.affiliationCentro Federal de Educação Tecnológica de Minas Gerais, CEFET, Belo Horizonte, Brasilpt_BR
dc.creator.affiliationUniversidade Federal de Minas Gerais, UFMG, Belo Horizonte, MG, Brasilpt_BR
dc.creator.affiliationUniversidade Federal de Minas Gerais, UFMG, Belo Horizonte, MG, Brasilpt_BR
dc.identifier.fasciculo2pt_BR
dc.identifier.vol27pt_BR
dc.title.journalJournal of the Brazilian Chemical Societypt_BR
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