g-C3N4/Nb2O5 heterostructures tailored by sonochemical synthesis: Enhanced photocatalytic performance in oxidation of emerging pollutants driven by visible radiation

Autor(es)

da Silva, Gelson T. S. T. ; Carvalho, Kele T. G. ; Lopes, Osmando F. ; Ribeiro, Caue

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 216, p. 70-79, NOV 5 2017.
• Citações Web of Science: 35

Resumo

In this study, g-C3N4/Nb2O5 heterostructures were successfully prepared by a sonochemical method based on surface charge -induced heteroaggregation. Under visible irradiation, the heterostructured gC(3)N(4)/Nb2O5 samples exhibited higher activity in the photooxidation of the drug amiloride (AML) and rhodamine B dye (RhB), compared to the pure g-C3N4 and Nb2O5 phases. The enhanced photocatalytic activity of the heterostructures could be attributed to the effective formation of heterojunctions between the g-C3N4 and Nb2O5 semiconductors, causing the migration of photogenerated electrons and holes, hence increasing their lifetimes. Formation of the type -II heterostructure was confirmed by time -resolved photoluminescence, in which the 3CN:1Nb heterostructure showed the longest electron/hole pair lifetime. The 3CN:1Nb and 1CN:3Nb heterostructures exhibited high stability even after four cycles of reuse in RhB dye and drug AML oxidation, respectively. In summary, the combination of g-C3N4 with Nb2O5 to produce a type -II heterostructure is a good strategy to overcome important challenges in photocatalysis. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 16/09746-3 - Redução Eletro-/fotoeletrocatalítica de CO2: Eficiência, Seletividade e Cinética Oscilatória
• Beneficiário: Osmando Ferreira Lopes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/17639-4 - Obtenção de semicondutores nanoestruturados: correlação das propriedades fotocatalíticas com suas características estruturais
• Beneficiário: Waldir Avansi Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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