Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/41167
Registro completo de metadados
Campo DCValorIdioma
dc.creatorCarvalho, Hudson W. P.-
dc.creatorRocha, Marcus V. J.-
dc.creatorHammer, Peter-
dc.creatorRamalho, Teodorico C.-
dc.date.accessioned2020-05-24T21:22:02Z-
dc.date.available2020-05-24T21:22:02Z-
dc.date.issued2013-02-
dc.identifier.citationCARVALHO, H. W. P. et al. TiO2-Cu photocatalysts: a study on the long- and short-range chemical environment of the dopant. Journal of Materials Science, [S.l.], v. 48, p. 3904-3912, 2013. DOI: 10.1007/s10853-013-7192-1.pt_BR
dc.identifier.urihttps://link.springer.com/article/10.1007/s10853-013-7192-1pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/41167-
dc.description.abstractIn this study, the short- and long-range chemical environments of Cu dopant in TiO2 photocatalyst have been investigated. The Cu-doped and undoped TiO2 specimens were prepared by the sol–gel approach employing CuSO4·5H2O and Ti(O-iPr)4 precursors and subjecting the dried gels to thermal treatment at 400 and 500 °C. The photocatalytic activity, investigated by methylene blue degradation under sunlight irradiation, showed a significantly higher efficiency of Cu-doped samples than that of pure TiO2. The X-ray diffraction results showed the presence of anatase phase for samples prepared at 400 and 500 °C. No crystalline CuSO4 phase was detected below 500 °C. It was also found that doping decreases the crystallite size in the (004) and (101) directions. Infrared spectroscopy results indicated that the chemical environment of sulfate changes as a function of thermal treatment, and UV–vis spectra showed that the band gap decreases with thermal treatment and Cu doping, showing the lowest value for the 400 °C sample. X-ray absorption fine structure measurements and analysis refinements revealed that even after thermal treatment and photocatalytic assays, the Cu2+ local order is similar to that of CuSO4, containing, however, oxygen vacancies. X-ray photoelectron spectroscopy data, limited to the near surface region of the catalyst, evidenced, besides CuSO4, the presence of Cu1+ and CuO phases, indicating the active role of Cu in the TiO2 lattice.pt_BR
dc.languageen_USpt_BR
dc.publisherSpringerpt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceJournal of Materials Sciencept_BR
dc.subjectTiO2pt_BR
dc.subjectMethylene bluept_BR
dc.subjectPhotocatalytic activitypt_BR
dc.subjectCoordination shellpt_BR
dc.subjectTiO2 Latticept_BR
dc.titleTiO2-Cu photocatalysts: a study on the long- and short-range chemical environment of the dopantpt_BR
dc.typeArtigopt_BR
Aparece nas coleções:DQI - Artigos publicados em periódicos

Arquivos associados a este item:
Não existem arquivos associados a este item.


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.