| Texto completo | |
| Autor(es): Mostrar menos - |
Souza, Josiane C.
;
Lemos, Samantha C. S.
;
Assis, Marcelo
;
Fernandes, Carlos H. M.
;
Ribeiro, Lara K.
;
Nunez-de la Rosa, Yeison
;
Teodoro, Marcio D.
;
Gracia, Lourdes
;
Andres, Juan
;
Mascaro, Lucia H.
;
Longo, Elson
Número total de Autores: 11
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS OMEGA; v. 9, n. 33, p. 11-pg., 2024-08-07. |
| Resumo | |
Ag2CrO4 is a representative member of a family of Ag-containing semiconductors with highly efficient visible-light-driven responsive photocatalysts. The doping process with Eu3+ is known to effectively tune their properties, thus opening opportunities for investigations and application. Here, we report the enhancement of the photocatalytic activity and stability of Ag2CrO4 by introducing Eu(3+)cations. The structural, electronic, and photocatalytic properties of Ag2CrO4:xEu(3+ )(x = 0, 0.25, 0.5, 1%) synthesized using the coprecipitation method were systematically discussed, and their photodegradation activity against rhodamine B (RhB), ciprofloxacin hydrochloride monohydrate (CIP), and 4-nitrophenol (4-NP) was evaluated. Structural analyses reveal a short-range symmetry breaking in the Ag2CrO4 lattice after Eu3+ doping, influencing the material morphology, size, and electronic properties. XPS analysis confirmed the incorporation of Eu3+ and alteration of the surface oxygen species. Furthermore, photoluminescence measurements indicated that the doping process was responsible for reducing recombination processes. The sample doped with 0.25% Eu3+ exhibited superior photocatalytic performance compared to pure Ag2CrO4. Scavenger experiments revealed an increase in the degradation via center dot OH reactive species for the sample doped with 0.25% Eu3+. DFT calculations provided atomic-scale insights into the structural and electronic changes induced by the Eu(3+ )doping process in the Ag2CrO4 host lattice. This study confirms that Eu3+ doping alters the band structure, enabling different degradation paths and boosting the separation/transfer of photogenerated charges, thereby improving the overall photocatalytic performance. (AU) | |
| Processo FAPESP: | 23/12399-7 - Influência do doping de terras raras na estrutura do fotoânodo de BiVO4 para degradação de biomassa e geração de combustíveis |
| Beneficiário: | Lara Kelly Ribeiro da Silva |
| Modalidade de apoio: | Bolsas no Brasil - Programa Fixação de Jovens Doutores |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 22/10340-2 - EMU científico: aquisição de um sistema de fluorescência de alta resolução temporal, espacial, espectral e operando em amplo intervalo de temperatura |
| Beneficiário: | Gilmar Eugenio Marques |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Infraestrutura - Científico |