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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.)

Methylene blue photodegradation employing hexagonal prism-shaped niobium oxide as heterogeneous catalyst: Effect of catalyst dosage, dye concentration, and radiation source

Texto completo
Autor(es):
de Moraes, Nicolas Perciani [1] ; Silva, Fernanda Nascimento [1] ; Caetano Pinto da Silva, Maria Lucia [1] ; Bastos Campos, Tiago Moreira [2] ; Thim, Gilmar Patrocinio [2] ; Rodrigues, Liana Alvares [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, EEL, Dept Engn Quim, Estr Municipal Campinho S-N, BR-12602810 Lorena, SP - Brazil
[2] ITA, CTA, Praca Mal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Materials Chemistry and Physics; v. 214, p. 95-106, AUG 1 2018.
Citações Web of Science: 10
Resumo

This paper evaluates the feasibility of using niobium-based catalysts for the photodegradation of organic dyes. The metal oxides were prepared using niobium scraps and chips as precursors. The semiconductors were characterized by diffuse reflectance spectroscopy, scanning electron microscopy (SEM), X-ray diffraction, infrared and Raman spectroscopy. The as-prepared anhydrous niobium oxide has a pseudohexagonal structure, whereas the hydrated niobium oxide is an amorphous material. The specific surface area of the hydrated niobium oxide is found to be double the area of its calcined counterpart. The photocatalytic efficiency of the materials was evaluated by methylene blue (MB) decomposition, measured by UV-visible spectroscopy. The effects of catalyst dosage and initial dye concentration were investigated in both the adsorption and photocatalysis processes. Increasing the initial MB concentration leads to increase the amount of adsorbed MB but to decrease the photocatalytic efficiency for all materials. In contrast, both the amount of adsorbed dye and the photocatalytic efficiency increase with increasing the catalyst dosage (0.5-2 g L-1). The highest photodegradation efficiency is achieved using UVC radiation. The specific surface area as well as the amount of acid sites, adsorbed water, and OH surface groups on the catalyst surface demonstrates to be fundamental to the photocatalytic properties of the materials. Furthermore, the photocatalytic mechanism is controlled by superoxide and singlet oxygen species for the hydrated material, whereas the hydroxyl radical is the main active species in the photodegradation employing the anhydrous oxide. The hydrated material achieved a complete degradation of the methylene blue. (C) 2018 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 16/20920-5 - Fotocatálise heterogênea aplicada na degradação de poluentes orgânicos utilizando catalisador híbrido de óxido de zinco-xerogel de carbono
Beneficiário:Nicolas Perciani de Moraes
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 15/08995-7 - Preparação, modificação e avaliação catalítica de fotocatalisadores à base de Nb2O5
Beneficiário:Liana Alvares Rodrigues
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 16/04244-0 - Preparação, modificação e avaliação catalítica de fotocatalisadores híbridos TiO2/Xerogel de carbono
Beneficiário:Nicolas Perciani de Moraes
Linha de fomento: Bolsas no Brasil - Iniciação Científica