Busca avançada
Ano de início
Entree
(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.)

Investigation of the photocatalytic activity of titanium dioxide films under visible light measured by electrospray mass spectrometry

Texto completo
Autor(es):
Souza, Diego H. P. [1] ; Guimaraes, Robson R. [1] ; Correra, Thiago C. [1] ; Zamarion, Vitor M. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: NEW JOURNAL OF CHEMISTRY; v. 42, n. 22, p. 18259-18268, NOV 21 2018.
Citações Web of Science: 0
Resumo

We report, for the first time, the photocatalytic activity of pure TiO2 P-25 in the form of thin homogeneous mesoporous films under visible light activation. The study was accomplished by analyzing the photodegradation rate of two water contaminant molecules, 2-naphthol and methyl orange, via an electrospray mass spectrometry technique with the use of ammonium hexafluorophosphate as an internal standard. The employed methodology can also be used to run different semiquantitative assays and study other film mediated photocatalytic processes. It was observed that TiO2 films can easily promote photooxidation of 2-naphthol under the incidence of visible light and in the presence of oxygen gas by showing almost complete photodegradation after about 6 hours of reaction. Photooxidation of methyl orange was also observed, yet the decay rate was slower. This process was also confirmed through identification of by-products of the reaction via mass spectrometry and through the decay of the absorbance peak at 468 nm via UV-vis spectrophotometry. This photoactivity of pure TiO2 P-25 films under visible light is attributed to its narrower band gap that occurs because of the thermal treatment that titania undergoes in the process of synthesis of the films. The use of these films as photocatalysts is an advantage since they work as a heterogenous catalyst in the absence of UV radiation. (AU)

Processo FAPESP: 14/15962-5 - Mecanismos de reação de sistemas catalíticos assimétricos por espectrometria de massas e espectroscopia vibracional de íons na fase gasosa
Beneficiário:Thiago Carita Correra
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 17/09469-2 - Desenvolvimento de sistemas plasmônico-quirais para utilização como sensores, propagação de luz e informação molecular
Beneficiário:Vitor de Moraes Zamarion
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 16/18354-1 - Estudos de labilidade / inércia na superfície de nanopartículas plasmônicas visando o desenvolvimento de sistemas para reconhecimento e transferência de informação molecular
Beneficiário:Diego Holanda Pereira de Souza
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 15/08539-1 - EMU concedido no processo 2014/15962-5: espectrômetro de massas tipo íon TRAP modificado para realização de espectroscopia vibracional no infravermelho (IRMPD)
Beneficiário:Thiago Carita Correra
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários