| Texto completo | |
| Autor(es): |
Fernandes, Matheus Horstmann
;
Ramos, Bruno
;
da Silva, Andre Luiz
;
Bettini, Jefferson
;
Teixeira, Antonio Carlos Silva Costa
;
Gouvea, Douglas
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CERAMICS INTERNATIONAL; v. 51, n. 9, p. 14-pg., 2025-04-01. |
| Resumo | |
This paper focuses on optimizing the photocatalytic performance of anatase TiO2 nanoparticles by employing two key methodologies: additive segregation and transition metal doping. We investigate the effects of incorporating chromium (Cr), copper (Cu), iron (Fe), and manganese (Mn) into the semiconductor. Using selective dopant lixiviation and X-ray photoelectron spectroscopy (XPS), we confirm the surface segregation of the dopants, which significantly affects the catalytic activity of the nanoparticles. We systematically demonstrate that Cr-doped TiO2 enhances the catalytic oxidation of acetaminophen compared to pristine TiO2 and alternative dopants, particularly under low-energy light sources. This enhanced performance is attributed to the segregation of Cr ions on the semiconductor surface. Furthermore, photocatalytic assessments under UV and white light irradiation, along with catalysts subjected to dopant removal via selective lixiviation, consistently demonstrate a return to photocatalytic efficiencies mirroring those of the undoped sample. These findings underscore the major role of surface composition in dictating the photocatalytic capabilities of TiO2-based photocatalysts. (AU) | |
| Processo FAPESP: | 19/10109-6 - Controle das interfaces de nanopartículas de óxidos semicondutores para a fotossíntese artificial |
| Beneficiário: | Douglas Gouvêa |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |