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KMID : 1024520030120070775
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Journal of the Environmental Sciences
2003 Volume.12 No. 7 p.775 ~ p.782
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Photodegradation of Pyrene, Chrysene and Benzo[a]pyrene in Water (II)
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Kam Sang-Kyu
Kim Ji-Yong
Ju Chang-Sik
Lee Min-Gyu
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Abstract
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The photodegradations of pyrene, chrysene and benzo[a]pyrene that were similar in structure among polycyclic aromatic hydrocarbons (PAHs) were investigated with a low-pressure mercury lamp(the wavelength of 253.7 nm and UV output of 1.3510-3/J/s). The optimum concentrations of TiO and HO on the photodegradation of pyrene, chrysene and benzo[a]pyrene were 1 g/L and 1.510-3/ M, respectively. By these optimum concentrations, their rates increased with increasing the concentration of TiO and HO because the amounts of OH radical formed increased, but for the higher concentrations than the optimum, their rates decreased with increasing those concentrations because the white turbidity phenomena occurs in case of TiO and HO acts as an OH radical inhibitor. The photodegradation rates among the photodegradation processes such as UV, UV/TiO, UV/HO, and UV/HO/TiO decreased in the following sequences.: UV/HO/TiO> UV/HO> UV/TiO> UV.
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KEYWORD
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Photodegradation, Pyrene, Chrysene, Benzo[a]pyrene, PAHs
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