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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|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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