Picture of a sphere with binary code

Making Strathclyde research discoverable to the world...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. It exposes Strathclyde's world leading Open Access research to many of the world's leading resource discovery tools, and from there onto the screens of researchers around the world.

Explore Strathclyde Open Access research content

The alteration of the structural properties and photocatalytic activity of TiO2 following exposure to non-linear irradiation sources

Lee, Soo-Keun and Robertson, Peter K.J. and Mills, Andrew and McStay, Daniel and Elliott, N. and McPhail, Donald (2003) The alteration of the structural properties and photocatalytic activity of TiO2 following exposure to non-linear irradiation sources. Applied Catalysis B: Environmental, 44 (2). pp. 173-184. ISSN 0926-3373

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

When TiO2 powder was irradiated with a laser light (>0.8 MW peak pulse power (PPP) at 355 nm) a visible change in its colour from white to dark blue was observed. The initial rate of change of the total colour difference was related to the laser light intensity and the longer the irradiation time the more substantial the colour change. The result of X-ray diffraction (XRD) studies showed that the crystal structure of the TiO2 developed a more rutile form after laser exposure. ESR studies indicated that the colour change was associated with the generation of Ti(III) species in the photocatalyst. Electron microscopic studies showed that more spherical shaped particles of TiO2 were observed after laser treatment although the average particle size remained largely unchanged. No significant changes in the band gap or the surface area of the laser modified TiO2 were observed. The laser modified photocatalyst showed no enhancement in activity for the destruction of methylene blue, rhodamine B and stearic acids, indicating that the rutile/anatase ratio is unimportant in the destruction of the test pollutants used in this work, via TiO2 photocatalysis.