A glass-supported pure anatase film with an extremely high photocatalytic activity has been prepared. Photocatalytic properties of the film were investigated by measuring the degradation of gaseous acetaldehyde under relatively strong (black fluorescent light) and weak (white fluorescent light) UV light irradiations. It was found that the photocatalytic efficiency was higher than that of Degussa P25, one of the most efficient commercial TiO2 powders.
Efficient TiO2 powder and film photocatalysts with the rutile structure were prepared. Their photocatalytic properties were assessed by measuring the photooxidative decomposition of gaseous acetaldehyde. The rutile powder showed much higher photoactivity than Degussa P-25 powder, both in degradation rate and in quantum efficiency. Moreover, the rutile film prepared by sintering the rutile sol at 450 °C also showed rather high photocatalytic activity.
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