| 초록 |
Removal of environmental pollutants by using photocatalysis has been a recent hot issue in the literatures. Trichloroethylene (TCE) has been a major air pollutant since it has toxicity, smog, and carcinogenic property. In the present study, the photocalytic degradation of TCE has been studied in an annulus fluidized bed reactor using TiO2/SiO2 photocatalyst. The effects of the initial TCE concentration, light intensity, and wavelength of the UV light on the photodegradation of TCE have been determined. It has been found that reactivity of TCE increases with decreasing the initial TCE concentration at a given gas velocity. The reaction rate increases with increasing light intensity and decreasing wavelength of the UV light. To improve the efficiency and throughput of TCE removal, a circulating fluidized bed (CFB) photo-reactor was designed to increase contacting among TCE, TiO2/SiO2 and UV light. The TCE degradation increases with increasing suitable gas velocity due to the increase of contacting among TCE, TiO2/SiO2 and UV light. The CFB photo-catalytic reactor provides higher photon-energy utilization compared to that in the annulus fluidized bed photoreactor. |
