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Applications of photocatalytic reactions are now being developed widely for various purposes. These reactions have been especially successful in the remediation of groundwater and soil polluted with organic chlorine compounds. The degradation reactions of these compounds in the gas phase progress fast, but the reaction mechanism is not yet well understood. For example, some unusual phenomena, seen in the effect of the pre-illumination of photocatalysts and that of repeated reactions, have been reported, but the acceleration of the reactions has not been explained based on the surface reactions. For that reason, we studied photochemical reactions and compared them with photocatalytic reactions. We explain the large acceleration of photocatalytic degradation of trichloroethylene (TCE) in a repeated reaction by taking photochemical reaction into consideration. We also explain the very fast degradation reaction of TCE based on the present results.

Gas-Phase Photocatalytic Degradation of Trichloroethylene -Relation with Photochemical Reactions