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pp.775-782
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 1.35x10-3 J/s). The optimum concentrations of TiO2 and H2O2 on the photodegradation of pyrene, chrysene and benzo[a]pyrene were 1 g/L and 1.5 x 10-3 M, respectively. By these optimum concentrations, their rates increased with increasing the concentration of TiO2 and H2O2 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 TiO2 and H2O2 acts as an OH radical inhibitor. The photodegradation rates among the photodegradation processes such as UV, UV/TiO2, UV/H2O2, and UV/H2O2/TiO2 decreased in the following sequences: UV/H2O2/TiO2> UV/H2O2> UV/TiO2> UV.
