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espace at MMU > Research Institutes > Dalton Research Institute > Material Science > SEM and Raman study of thermally treated TiO2 anatase nanopowders: influence of calcination on photocatalytic activity

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Title: SEM and Raman study of thermally treated TiO2 anatase nanopowders: influence of calcination on photocatalytic activity
Authors: Mahdjoub, N.
Allen, Norman S.
Kelly, Peter
Vishnyakov, Vladimir
Citation: Journal of Photochemistry and Photobiology A: Chemistry, 2010, vol. 211, no. 1, pp. 59-64
Publisher: Elsevier
Issue Date: 2010
DOI: 10.1016/j.jphotochem.2010.02.002
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Abstract: Titania (TiO2) nanopowders called PC 500, synthesised by the sulphate process, were annealed in air at temperatures of up to 1022 K for 30 min. The X-ray Diffraction (XRD) indicates that the thermal annealing resulted in coarsening of the average crystallite size from 13 to 72 nm. However, Scanning Electron Microscopy (SEM) reveals persistence of platelet-like structures which survive up to temperatures around 900 K. This implies that the crystals at least partially grow within the plates in 2D confinement. This implies that direct usage of Scherrer equation in this case should be approached with care. Raman spectra peak positions and the Full-Width-at-Half-Maximum (FWHM) values changed considerably after calcinations crystal growth, while, material composition and oxygen content remain unchanged. The Raman peak behaviour can be cautiously attributed to the first order phonon confinement phenomena, but both, 2D and 3D models of confinement should be accounted. The highest photoactivity, as indicated by photoinduced degradation of a mono azo dye methyl-orange (C14H14N3SO3Na), was observed in material treated at 773 K.
Type: Article
Language: en
Description: Full-text of this article is not available in this e-prints service. This article was originally published following peer-review in Journal of Photochemistry and Photobiology, A: Chemistry, published by and copyright Elsevier.
Keywords: Titanium dioxide
Dye fading
ISSN: 1010-6030
Appears in Collections: Material Science

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