| Texto completo | |
| Autor(es): |
de Sousa, P. B.
;
Nogueira, I. C.
;
Gusmao, G. O. M.
;
Gusmao, S. B. S.
;
Lopes, F. H. P.
;
Sousa, B. S.
;
Sczancoski, J. C.
;
Gouveia, A. F.
;
Cavalcante, L. S.
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 33, n. 28, p. 26-pg., 2022-09-18. |
| Resumo | |
In this paper, the solid solutions of strontium molybdate-tungstate [Sr(Mo1-xWx)O-4] crystals with (x = 0, 0.25, 0.50, 0.75, and 1) were synthesized by the sonochemical method. Their structure, morphology, optical, and sonophotocatalytic properties were performed in function of the replacement of Mo6+ by W6+ cations into the lattice. Their structure and elemental composition were characterized using X-ray diffraction, Rietveld refinement, micro-Raman, energy-dispersive X-ray, and Fourier-transform infrared spectroscopies proving that all samples are monophasic, crystalline, and exhibit a scheelite-type tetragonal structure. Field-emission scanning electron microscopy images revealed the octahedral and dumbbell-like morphologies for SrMoO4 and SrWO4 crystals. Moreover, it is noted to pass through spindle-like morphology for the microcrystals containing both Mo6+ and W6+ cations (x = 0.25, 0.50, and 0.75). Ultraviolet-visible diffuse reflectance spectroscopy showed a directly proportional increase in the optical band gap (E-gap) values from 4.27 to 5.01 eV. These data indicate an increase in the intermediary electronic levels between valance and conduction bands with the increase in the concentration of W6+ cations in the lattice. Finally, we have obtained good sonophotocatalytic performances for SrMoO4 crystals (90%), and mainly to Sr(Mo0.25W0.75)O-4 crystals (98%) in the degradation of Rhodamine B dye until 240 min under UV-C light. (AU) | |
| 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: | 19/01732-1 - Atividade fotocatalítica de semicondutores multifuncionais: influência da morfologia e injeção de elétrons |
| Beneficiário: | Amanda Fernandes Gouveia |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 12/14004-5 - Investigação das propriedades fotoluminescentes e fotocatalíticas de pós de BaWO4 e BaMoO4 puros e dopados com Mn, Cu e Zn |
| Beneficiário: | Júlio César Sczancoski |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |