Abstract

Photodegradations of gaseous isopropyl alcohol over UV irradiated films prepared from peroxo-modified anatase sol (PA sol) were studied. When the amount of the film formed by PA sol was 0.25mg/cm2, the film showed high photocatalytic activities, however, the activities for the films of 0.075mg/cm2 and 0.15mg/cm2 were low significantly. By use of PA sol added with TiO2 powder (Degussa P25), the pore size in the film increased, the transmittance of the film decreased over the visible and UV region, and their photocatalytic activities were improved remarkably. In case of coating of 0.075mg/cm2, the film prepared from PA sol adding 20mass% of TiO2 powder showed about twentyfold photocatalytic activities compared with a film without TiO2 powder. Maximum photocatalytic activity was achieved by use of the sample containing 60mass% of TiO22 powder.

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