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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 312, p. 55-63, NOV 1 2015.
• Web of Science Citations: 5

Abstract

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)

• FAPESP's process: 12/07067-0 - Photocatalyst based in bismuth titanate synthesized by the oxidant peroxo method (OPM)
• Grantee: Emerson Rodrigues de Camargo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 10/20129-0 - Photocatalytic properties of bismuth titanate synthesized by the oxidant peroxide method (OPM)
• Grantee: André Esteves Nogueira
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC