DETOXIFICATION OF TRICHLOROETHYLENE (TCE) USING SOLAR LIGHT/TiO2 IN A UV CONCENTRATING RADIATION SYSTEM

概要

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There has been considerable interest in photocatalytic oxidation of recalcitrant contaminants using titanium dioxide (TiO2) in recent years. A solar-driven, photocatalyzed detoxification system using TiO2 was constructed, and this system was applied for the degradation of trichloroethylene (TCE) contaminated water. The results showed that, with both UV light illumination and TiO2 present, TCE was more effectively degraded than with either UV or TiO2 alone. A 50ppm of TCE could be completely degraded in 3 to 4 hours of solar light illumination. Photocatalytic degradation of TCE increased linearly with increasing sunlight intensity. The degradation of TCE also increased with increasing TiO2 dose, however, the degradation efficiency reached a plateau over 0.2 wt% of TiO2 dose. The mass balance study showed that about 80% of chloride was recovered as TCE degradation byproducts. Finally, the experiment was performed in order to examine the deactivation of TiO2 due to the adsorption of TCE during consecutive runs, but no reduction in the activity of TiO2 was observed after the deionized water regeneration.
Japan Society on Water Environmentの論文