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Photo-catalysis using titanium dioxide nanotube layers

Paper ID Volume ID Publish Year Pages File Format Full-Text
29086 44118 2008 5 PDF Available
Title
Photo-catalysis using titanium dioxide nanotube layers
Abstract

Photo-degradation of acid orange 7 in aqueous solution was used as a probe to assess the photo-catalytic activity of titanium dioxide nanotube layers under UV irradiation. The nanotube layers were prepared by anodization of Ti foil in 0.4 wt% hydrofluoric acid solution and then annealed at different temperatures between 300 °C and 600 °C for 1 h. The nanotube layers were characterized using X-ray diffraction and scanning electron microscopy. After the 500 °C anneal, the anatase and rutile mass fractions were measured to be about 55% and 45%, respectively. After annealing at 500 °C, the anatase crystallite size was maximum while the size and shape of the nanotubes remain unaffected. Such TiO2 nanotube layers showed strong photo-catalytic activity. During UV irradiation, we measured the total disappearance of the organic carbon and the formation of anion species to confirm the total mineralization of the acid orange 7.

Keywords
Titanium dioxide nanotubes; Anatase; Rutile; Photo-degradation; Acid orange 7 (AO7); Mineralization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 199, Issues 2–3, 25 September 2008, Pages 250–254
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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