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Type: Artigo de periódico
Title: Photoelectrochemical And Photocatalytic Properties Of Tio 2, Wo 3and Wo 3-tio2 Porous Films In The Photodegradation Of Rhodamine 6g In Aqueous Solution
Author: Oliveira H.G.
Fitzmorris B.C.
Longo C.
Zhang J.Z.
Abstract: The photoelectrochemical properties of TiO 2, WO 3 and WO 3-TiO 2 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 WO 3 film, consisting of flakes of 70 nm diameter nanoparticles, exhibited relatively poor activity in R6G photodegradation, which was attributed to low surface coverage. The TiO 2 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 WO 3-TiO 2 bilayer, consisting of a TiO 2 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 .8 min-1. The improved performance of the WO 3-TiO 2 bilayer film electrode is attributed to enhanced light harvesting and reduced charge recombination. © 2012 by American 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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