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Photocatalytic properties of TiO2/WO3 coatings formed by plasma electrolytic oxidation of titanium in 12-tungstosilicic acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
46559 46441 2012 8 PDF Available
Title
Photocatalytic properties of TiO2/WO3 coatings formed by plasma electrolytic oxidation of titanium in 12-tungstosilicic acid
Abstract

In this paper, we have investigated photocatalytic properties of TiO2/WO3 coatings formed by plasma electrolytic oxidation (PEO) of titanium in 12-tungstosilicic acid water solution and compared with photocatalytic activity of pure TiO2 coatings. The photocatalytic activity of the coatings is evaluated by measuring the degradation of methyl orange under simulated sunlight conditions. Photocatalytic activity of TiO2/WO3 coatings varied with duration of PEO process and higher photoactivity is obtained for a shorter process time. Photocatalytic activity of TiO2/WO3 coatings is related to morphology and phase and elemental composition of coatings. The oxide coatings morphology is strongly dependent on PEO time. The elemental components of the coatings are Ti, W and O. The oxide coatings are partly crystallized and mainly composed of WO3 and anatase. Decrease in the number of microdischarge channels and agglomeration of particles on the surface leads to a decrease in photocatalytic activity. The reduction of the photocatalytic activity with increased time of PEO process is accompanied with the increase of WO3 concentration on the coatings’ surface. Diffuse reflectance spectroscopy has shown that coatings enriched with tungsten oxide exhibit significant red shift with respect to the pure TiO2 coatings. TiO2/WO3 coatings with improved catalytic activity, compared to pure TiO2 coatings, are grouped around energy band gap of 2.6 eV. The results of PL measurements of TiO2/WO3 coatings are in agreement with photocatalytic activities. The increase of PL intensity corresponds to decrease of photocatalytic activity of the coatings, indicating fast recombination of electron–hole pairs.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ Plasma electrolytic oxidation (PEO) of titanium in 12-tungstosilicic acid. ▸ Preparation of TiO2/WO3 coatings by PEO process. ▸ Photocatalytic activity (PA) of TiO2/WO3 coatings varies with duration of PEO. ▸ PA of TiO2/WO3 is related to morphology, phase and elemental composition of coatings. ▸ The increase of photoluminescence corresponds to decrease of PA of TiO2/WO3 coatings.

Keywords
Photocatalysis; Plasma electrolytic oxidation; TiO2/WO3; TiO2
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Photocatalytic properties of TiO2/WO3 coatings formed by plasma electrolytic oxidation of titanium in 12-tungstosilicic acid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 126, 25 September 2012, Pages 334–341
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us