Lim Tak Hyoung, Kim Sang Done
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.
Chemosphere. 2004 Jan;54(3):305-12. doi: 10.1016/S0045-6535(03)00753-7.
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.
在环形流动型光反应器中，已测定了三氯乙烯（TCE）气体流速、相对湿度、TiO₂膜厚度和紫外光强度对TCE光降解的影响。光气和二氯乙酰氯的生成可作为TCE气体流速的函数进行控制，且TCE的光降解随相对湿度的增加而降低。发现TiO₂膜的最佳厚度约为5μm，TCE的光催化反应速率随紫外光强度的平方根增加。此外，在环形流化床光反应器中，已测定了初始TCE浓度、气固相含率比（εg/εs）、CuO负载量对TCE光降解的影响。TCE光降解随初始TCE浓度的增加而降低。发现TCE最大光降解的最佳气固相含率比（εg/εs）和CuO重量百分比分别为2.1和1.1 wt.%。因此，环形流化床光反应器是一种利用光子能量高效降解TiO₂/硅胶上TCE的有效工具。
