Effect of lanthanum and lead doping on the microstructure and visible light photocatalysis of bismuth titanate prepared by the oxidant peroxide method (OPM)

Autor(es)

Nogueira, Andre E. ^[1] ; Lima, Alan R. F. ^[1] ; Longo, Elson ^[2] ; Leite, Edson R. ^[1] ; Camargo, Emerson R. ^[1]

Afiliação do(s) autor(es)

^[1] UFSCar Univ Fed Sao Carlos, LIEC Lab Interdisciplinar Eletroquim & Ceram, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

^[2] UNESP Univ Estadual Paulista, Inst Quim Araraquara, BR-14801907 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 312, p. 55-63, NOV 1 2015.
• Citações Web of Science: 5

Resumo

Pure (Bi12TiO20) and La- and Pb-doped (Bi12-xLaxTiO20 e Bi12-xPbxTiO20, with ``x{''} up to 1.50) bismuth titanates were prepared by the oxidant peroxide method (OPM) and used for photodegradation of rhodamine b (RhB). The synthesized materials samples were characterized by X-ray diffraction (XRD), UV vis diffuse reflectance spectra (DRS), X-ray photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), X-ray fluorescence (XRF) and N-2 physical adsorption. Rietveld refinements showed samples consisting mainly of sillenite structure with small amounts of a perovskite secondary phase in the La- and Pb-doped materials. The photocatalytic properties of all materials were evaluated by the discoloration of RhB solution under ultraviolet (UV) and visible irradiation, where the bismuth titanate obtained by the OPM route showed higher photocatalytic activity than the commercial TiO2. Furthermore, it was observed that the insertion of different ions in the bismuth titanate structure changes the band gap energy in different ways, which consequently altered the photocatalytic activities of the materials. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/07067-0 - Fotocatalisadores baseados em titanato de bismuto sintetizadas pelo método dos complexos oxidantes de peróxido (OPM)
• Beneficiário: Emerson Rodrigues de Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/20129-0 - Propriedades fotocatalíticas do titanato de bismuto obtido pela rota dos complexos oxidantes de peróxido (OPM)
• Beneficiário: André Esteves Nogueira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs