Trichloroethylene degradation by photocatalysis in annular flow and annulus fluidized bed photoreactors.
The effects of trichloroethylene (TCE) gas flow rate, relative humidity, TiO(2) film thickness, and UV light intensity on photodegradation of TCE have been determined in an annular flow type photoreactor. Phosgene and dichloroacetyl chloride formation could be controlled as a function of TCE gas flow rate and photodegradation of TCE decreased with increasing relative humidity. The optimum thickness of TiO(2) film was found to be approximately 5 mum and the photocatalytic reaction rate of TCE increased with square root of UV light intensity. In addition, the effects of the initial TCE concentration, phase holdup ratio of gas and solid phases (epsilon(g)/epsilon(s)), CuO loading on the photodegradation of TCE have been determined in an annulus fluidized bed photoreactor. The TCE photodegradation decreased with increasing the initial TCE concentration. The optimum conditions of the phase holdup ratio (epsilon(g)/epsilon(s)) and CuO wt.% for the maximum photodegradation of TCE was found to be 2.1 and 1.1 wt.%, respectively. Therefore, an annulus fluidized bed photoreactor is an effective tool for TCE degradation over TiO(2)/silica gel with efficient utilization of photon energy.
Department of Chemical and Biomolecular Engineering, Energy and Environment Research Center, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yuson-gu, DaeJeon 305-701, South Korea.
Tak Hyoung
TH
Lim
Sang Done
SD
Kim
D000397:Air Pollution / Q000517:prevention & control*; D002384:Catalysis; D006813:Humidity; D007700:Kinetics; D013058:Mass Spectrometry; D013997:Time Factors; D014025:Titanium; D014241:Trichloroethylene / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays
C009495:titanium dioxide; D014241:Trichloroethylene; D014025:Titanium