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Type: Artigo de periódico
Title: Photoelectrochemical and Photocatalytic Properties of TiO2, WO3 and WO3-TiO2 Porous Films in the Photodegradation of Rhodamine 6G in Aqueous Solution
Author: Oliveira, HG
Fitzmorris, BC
Longo, C
Zhang, JZ
Abstract: The photoelectrochemical properties of TiO2, WO3 and WO3-TiO2 bilayer porous films deposited on transparent electrodes have been investigated and correlated to the photocatalytic activity for Rhodamine 6G (R6G) degradation in aqueous solution under polychromatic irradiation. The WO3 film, consisting of flakes of 70 nm diameter nanoparticles, exhibited relatively poor activity in R6G photodegradation, which was attributed to low surface coverage. The TiO2 film, consisting of agglomerated spherical particles (25 nm in diameter) of both anatase and rutile phases based on Raman measurement, showed much better photocatalytic activity. The WO3-TiO2 bilayer, consisting of a TiO2 film deposited on the surface of a WO3 film, exhibited morphology similar to that of the TiO2 film and improved efficiency for R6G photodegradation. The degradation process followed pseudo-first order kinetics for the initial 3 hours for all three film electrodes, with apparent rate constants of 0.37, 2.3, and 2.8 min(-1). The improved performance of the WO3-TiO2 bilayer film electrode is attributed to enhanced light harvesting and reduced charge recombination.
Subject: WO3
Rhodamine 6G
Country: EUA
Editor: Amer Scientific Publishers
Rights: fechado
Identifier DOI: 10.1166/sam.2012.1337
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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