| Texto completo | |
| Autor(es): |
Carvalho, Kele T. G.
;
Nogueira, Andre E.
;
Lopes, Osmando F.
;
Byzynski, Gabriela
;
Ribeiro, Caue
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CERAMICS INTERNATIONAL; v. 43, n. 4, p. 3521-3530, MAR 2017. |
| Citações Web of Science: | 18 |
| Resumo | |
This paper describes the synthesis of a new series of g-C3N4/Nb2O5 heterostructures and their application in the removal of organic pollutants from water, as a combined strategy of photocatalysis and adsorption processes. The heterostructures were synthesized at different weight ratios through thermal oxidation and hydrothermal treatment, leading to an uniform assembly of Nb2O5 nanoparticles onto g-C3N4 surface. The heterostructures exhibited improved textural and electronic properties (narrowing in band gap) when compared to pure g-C3N4 and Nb2O5, respectively. Although adsorption capacities were shown to be influenced by Nb2O5 content, g-C3N4 was essential to increase the photocatalytic response of the g-C3N4/Nb2O5 heterostructures, which displayed an enhancement of photocatalytic performance on the degradation of methylene blue and rhodamine B dyes under visible and ultraviolet irradiation. The enhanced photoactivity was explained by the increase in the lifetime of the charge carries due to formation of heterojunctions between Nb2O5 and g-C3N4. A mechanistic investigation on the photocatalytic process was conducted by using different reactive scavenger species. The superoxide (O-2(-)) radical was found to be the main active specie on the dye photodegradation activated by visible radiation. (AU) | |
| Processo FAPESP: | 15/12304-0 - AVALIAÇÃO DA ATIVIDADE FOTOCATALÍTICA DE HETEROJUNÇÕES g-C3N4/Nb2O5 NO ABATIMENTO DE POLUENTES EM FASE GASOSA |
| Beneficiário: | Kele Tatiane Gomes Carvalho |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 13/13888-0 - Síntese de nano-heteroestruturas de BiVO4/óxidos de bismuto e avaliação de suas propriedades fotocatalíticas. |
| Beneficiário: | Osmando Ferreira Lopes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 14/09014-7 - Estudo do potencial de nano-heteroestruturas de óxidos de cobre e nióbio para aplicação em fotossíntese artificial |
| Beneficiário: | André Esteves Nogueira |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |