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

Autor(es)

Carvalho, Kele T. G. ; Nogueira, Andre E. ; Lopes, Osmando F. ; Byzynski, Gabriela ; Ribeiro, Caue

• 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