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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Synthesis of g-C3N4/Nb2O5 heterostructures and their application in the removal of organic pollutants under visible and ultraviolet irradiation

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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: 14/09014-7 - Estudo do potencial de nano-heteroestruturas de óxidos de cobre e nióbio para aplicação em fotossíntese artificial
Beneficiário:André Esteves Nogueira
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
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
Linha de fomento: 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
Linha de fomento: Bolsas no Brasil - Doutorado