Studies on photocatalytic oxidation reaction of SO2 over TiO2.

The influence of the baked temperature for TiO2 ultrafine particles on the photocatalytic oxidation reaction of SO2 was investigated. The photocatalyt ic activity of TiO2 baked at 320 degrees C is higher than that at other tem peratures (480 degrees C, 550 degrees C). It may be explained by the surfac e state of TiO2, increasing the content of surface hydroxyl is helpful to e nhance the photocatalytic activity. Recording to the experimental results, the first order kinetic reaction and the mechanism of the reaction were sug gested, also the rate constants and half-life time were reported.