Abstract
In this study, it was shown that a possible explanation of increasing photocatalytic activity with temperature may be the fact that with increasing water temperature, the amount of hydroxyl radicals in water also increases, because the ionic product of water increases with an increase in temperature. For measurements of the amount of hydroxyl radicals, the fluorescence technique was used. Terephthalic acid was used as a hydroxyl radical scavenger. After inducing of TiO2, positive holes in the valance band may react with OH ions and produce •OH radicals, a strong oxidizing agent.
Highlights
The photocatalyst, for example, titanium dioxide (TiO2) absorbs light with suitable wavelength in photocatalysis
The values of ionic product of water at different temperatures are presented in Table 1 [12]
The ionic product of water increases with temperature rise what is correlated with the increase of hydroxyl anions concentration in water
Summary
The photocatalyst, for example, titanium dioxide (TiO2) absorbs light with suitable wavelength in photocatalysis. Keywords Photocatalysis Á Ionic product of water Á Hydroxyl radicals Á Temperature M. Janus Department of Sanitary Engineering, West Pomeranian University of Technology, Al. Piastow 50, 70-310 Szczecin, Poland
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