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Campo DC | Valor | Idioma |
---|---|---|
dc.creator | Carvalho, Hudson W. P. | - |
dc.creator | Rocha, Marcus V. J. | - |
dc.creator | Hammer, Peter | - |
dc.creator | Ramalho, Teodorico C. | - |
dc.date.accessioned | 2020-05-24T21:22:02Z | - |
dc.date.available | 2020-05-24T21:22:02Z | - |
dc.date.issued | 2013-02 | - |
dc.identifier.citation | CARVALHO, 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.uri | https://link.springer.com/article/10.1007/s10853-013-7192-1 | pt_BR |
dc.identifier.uri | http://repositorio.ufla.br/jspui/handle/1/41167 | - |
dc.description.abstract | In 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.language | en_US | pt_BR |
dc.publisher | Springer | pt_BR |
dc.rights | restrictAccess | pt_BR |
dc.source | Journal of Materials Science | pt_BR |
dc.subject | TiO2 | pt_BR |
dc.subject | Methylene blue | pt_BR |
dc.subject | Photocatalytic activity | pt_BR |
dc.subject | Coordination shell | pt_BR |
dc.subject | TiO2 Lattice | pt_BR |
dc.title | TiO2-Cu photocatalysts: a study on the long- and short-range chemical environment of the dopant | pt_BR |
dc.type | Artigo | pt_BR |
Aparece nas coleções: | DQI - Artigos publicados em periódicos |
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