TiO2-Cu photocatalysts: a study on the long- and short-range chemical environment of the dopant

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorCarvalho, Hudson W. P.-
Autor(es): dc.creatorRocha, Marcus V. J.-
Autor(es): dc.creatorHammer, Peter-
Autor(es): dc.creatorRamalho, Teodorico C.-
Data de aceite: dc.date.accessioned2026-02-09T12:06:12Z-
Data de disponibilização: dc.date.available2026-02-09T12:06:12Z-
Data de envio: dc.date.issued2020-05-24-
Data de envio: dc.date.issued2020-05-24-
Data de envio: dc.date.issued2013-02-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/41167-
Fonte completa do material: dc.identifierhttps://link.springer.com/article/10.1007/s10853-013-7192-1-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1154361-
Descrição: dc.descriptionIn 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.-
Idioma: dc.languageen-
Publicador: dc.publisherSpringer-
Direitos: dc.rightsrestrictAccess-
???dc.source???: dc.sourceJournal of Materials Science-
Palavras-chave: dc.subjectTiO2-
Palavras-chave: dc.subjectMethylene blue-
Palavras-chave: dc.subjectPhotocatalytic activity-
Palavras-chave: dc.subjectCoordination shell-
Palavras-chave: dc.subjectTiO2 Lattice-
Título: dc.titleTiO2-Cu photocatalysts: a study on the long- and short-range chemical environment of the dopant-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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