| Texto completo | |
| Autor(es): |
Rodrigues, Barbara Scola
;
Branco, Carolyne Martins
;
Domingos, Lucas Rafael de Moura
;
Gaubeur, Ivanise
;
Wang, Zhiyu
;
Chen, Changqiang
;
Sardela, Mauro R.
;
Souza, Juliana dos Santos
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of the American Ceramic Society; v. 107, n. 2, p. 14-pg., 2023-10-10. |
| Resumo | |
Given its favorable physical and chemical properties, Bismuth vanadate (BiVO4) is a commonly studied metal oxide semiconductor for photocatalytic applications. However, BiVO4 shows a high recombination rate of photogenerated charges and limited charge transport capacity, which can be addressed by doping it with tungsten. To develop a highly efficient tungsten-doped BiVO4-based (W-BiVO4) photocatalyst, it is necessary to control the dopant content, crystal structure, and morphology. These properties are, in turn, governed by the synthesis conditions. This work describes a pioneering method of microwave-assisted reflux synthesis of W-BiVO4, using ethanol as solvent and polyvinyl pyrrolidone (PVP) as a capping agent. Thus, it is possible to perform the synthesis procedure in only 30 min at 78degree celsius, obtaining extremely regular monoclinic W-BiVO4 nanosquares. Furthermore, the experiments showed that the most efficient photocatalyst contains 3% tungsten as the dopant. Moreover, the direct oxidation of rhodamine B by the photogenerated holes plays a crucial role in the degradation mechanism. Finally, we observed that although the addition of PVP promotes control of the morphology, it results in a poorly efficient material. This low efficiency may be related to the formation of a polymeric coating on the surface of the catalyst or to a high amount of oxygen defects. Finally, we show that the unique interaction of microwaves with the species present in the reaction media influences nanoparticle growth. (AU) | |
| Processo FAPESP: | 21/05958-4 - Modulação de propriedades físico-químicas de semicondutores metálicos através do controle dos parâmetros de síntese assistida por micro-ondas |
| Beneficiário: | Juliana dos Santos de Souza Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/26010-9 - Dispositivos fotoativos baseados em heterojunções de vanadato de bismuto e óxido de tungstênio sobre grafeno |
| Beneficiário: | Bárbara Scola Rodrigues |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 16/23878-0 - Consolidação e inovação da linha de pesquisa: desenvolvimento de métodos analíticos combinados a microextração em fase líquida |
| Beneficiário: | Ivanise Gaubeur |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 11/19730-3 - Emprego da extração em ponto nuvem (CPE) e da microextração líquido-líquido dispersiva (DLLME) no desenvolvimento de métodos analíticos para a pré-concentração e determinação espectrométrica de metais |
| Beneficiário: | Ivanise Gaubeur |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |