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Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Photocatalytic oxidation of deposited sulfur and gaseous sulfur dioxide by TiO2 films

Mills, A. and Crow, M. and Wang, Jishun and Parkin, I.P. and Boscher, N. (2007) Photocatalytic oxidation of deposited sulfur and gaseous sulfur dioxide by TiO2 films. Journal of Physical Chemistry C, 111 (14). pp. 5520-5525.

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Abstract

Thick (4 μm) films of anatase titania are used to photocatalyze the removal of deposited films of amorphous sulfur, 2.8 μm, thick and under moderate illumination conditions (I = 5.6 mW cm-2) on the open bench the process is complete within 8 or 18 h using UVC or UVA light, respectively. Using UVA light, 96% of the product of the photocatalytic removal of the film of sulfur is sulfur dioxide, SO2. The photonic efficiency of this process is 0.16%, which is much higher (>15 times) than that of the removal of soot by the same films, under similar experimental conditions. In contrast to the open bench work, in a closed system the photocatalytic activity of a titania film toward the removal of sulfur decreased with repeated use, due to the accumulation of sulfuric acid on its surface generated by the subsequent photocatalytic oxidation of the initial product, SO2. The H2SO4-inactivated films are regenerated by soaking in water. The problems of using titania films to remove SO2 from a gaseous environment are discussed briefly.