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SEM and Raman study of thermally treated TiO2 anatase nanopowders: Influence of calcination on photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
27996 44055 2010 6 PDF Available
Title
SEM and Raman study of thermally treated TiO2 anatase nanopowders: Influence of calcination on photocatalytic activity
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.

Keywords
Titanium dioxide; Photocatalysis; Calcination; Dye fading; Raman
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SEM and Raman study of thermally treated TiO2 anatase nanopowders: Influence of calcination on photocatalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 211, Issue 1, 5 March 2010, Pages 59–64
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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
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