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Photoelectrocatalytic Activity of Electrosynthesised Tungsten Trioxide- Titanium Dioxide Bi-Layer Coatings for the Photooxidation of Organics
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J. Georgieva
Published/Copyright:
November 30, 2016
Abstract
Bi-layer WO3/TiO2 coatings, as well as single component WO3 coatings, have been electrosynthesized on stainless steel 304 (SS) substrates from peroxytungstate and titanium oxosulfate acidic solutions by potentiostatic cathodic deposition. The resulting WO3/TiO2/SS and WO3/SS photoelectrodes have been screened for their photoresponse under ultraviolet (UV) and visible (vis) light illumination by means of photovoltammetry and photoamperometry in sulfate solutions containing model organic pollutants. Larger specimens were also evaluated for bulk electrically enhanced photooxidation of oxalate and 4-chlorophenol under constant applied potential. It was found that the photoelectrocatalytic activity of bi-layer TiO2/WO3/SS is higher than that of plain WO3/SS photoelectrodes under both UV and, most interestingly, vis light illumination. This is interpreted by reduced electron-hole recombination rates due to electron transfer from TiO2 to WO3 (during UV light activation) and hole transfer from WO3 to TiO2 (during UV and vis light activation).
Keywords: tungsten trioxide coatings; titanium dioxide coatings; stainless steel; photoelectrochemistry; photooxidation
Received: 2008-3-15
Revised: 2008-4-30
Accepted: 2008-4-30
Published Online: 2016-11-30
Published in Print: 2008-7-1
© 2016 by Walter de Gruyter Berlin/Boston
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Keywords for this article
tungsten trioxide coatings;
titanium dioxide coatings;
stainless steel;
photoelectrochemistry;
photooxidation
Articles in the same Issue
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- Photocatalytic Degradation of Methylene Blue on Fixed Powder Layers: Which Limitations are to be Considered?
- Surface Modification of TiO2 with Ascorbic Acid for Heterogeneous Photocatalysis: Theory and Experiment
- Vacuum-UV- (VUV-) Photochemically Initiated Oxidation of Dimethylamine in the Gas Phase
- Metal-Oxide Photoassisted Degradation of Binary Systems of Cationic / Anionic Surfactants and their Components in Aqueous Dispersions
- Photochromic and Photocatalytic Inorganic-Organic Multilayer Films based on Polyoxometalates and Poly(ethylenimine)
- Biodegradation of Photo-Fenton Pre-Treated Solutions of Sulfamethoxazole by Aerobic Communities. Molecular Biology Techniques Applied to the Determination of Existing Strains
- Oxidation of Pesticides in Water by Fenton and Photo-Fenton Reactions
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