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Received September 14, 2001
Accepted October 13, 2001
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Effect of Humidity on the Photocatalytic Degradation of Trichloroethylene in Gas Phase over TiO2 Thin Films Treated by Different Conditions
NANOPAC Co.Ltd., 8F, Kyeonggi Venture Building Suwon Cente, 1017 Inge-dong, Paldal-gu, Suwon, Kyeonggi-do 442070, Korea
tklee@nano-pac.com
Korean Journal of Chemical Engineering, November 2001, 18(6), 935-940(6), 10.1007/BF02705622
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Abstract
The effect of humidity on the photocatalytic degradation reaction of trichloroethylene (TCE) in gas phase was investigated by using pretreated TiO2 sol-gel films. It was observed that the photocatalytic activity of the TiO2 films depended more greatly on the pretreatment conditions, for example, UV pre-illumination, than on the moisture content. When the relative humidity was over 50%, the reaction rates decreased regardless of treatment conditions of the photocatalyst. The photocatalytic decomposition rate of TCE increased with the increase of light intensity. However, the influence of humidity on the reaction rate was less significant under the increased light intensity The intermediates and byproducts of the reaction were not changed in different humidity conditions.
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Kim JS, Joo HK, Lee TK, Itoh K, Murabayashi M, J. Catal., 194(2), 484 (2000)
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Kutsuna S, Ebihara Y, Nakamura K, Ibusuki T, Atmospheric Environ., 27A, 599 (1993)
Matthews RW, J. Catal., 111, 264 (1988)
Jeon MS, Lee TK, Kim DH, Joo H, Kim HT, Sol. Energy Mater. Sol. Cells, 57(3), 217 (1999)
Murabayashi M, Itoh K, Kuroda S, Huda R, Masuda R, Takahashi W, Kawashima K, Denki Kagaku, 60, 741 (1992)
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Nimlos MR, Jacoby WA, Blake DM, Milne TA, Environ. Sci. Technol., 27, 732 (1993)
Ollis DF, Hsiao CY, Budiman L, Lee CL, J. Catal., 88, 89 (1984)
Ollis DF, Environ. Sci. Technol., 19, 480 (1985)
Ollis DF, Pelizzetti E, Serpone N, Environ. Sci. Technol., 25, 1523 (1991)
Tanguay JF, Suib SL, Coughlin RW, J. Catal., 117, 335 (1989)
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Yamazakinishida S, Cerveramarch S, Nagano KJ, Anderson MA, Hori K, J. Phys. Chem., 99(43), 15814 (1995)
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