Abstract
Heterogeneous photochemical reactions of trichloroethene (C 2HCl 3) and tetrachloroethene (C 2Cl 4) on titanium dioxide (TiO 2) were investigated. Both C 2HCl 3 and C 2Cl 4 were rapidly transformed to COCl 2 and were mineralized to Cl 2, HCl or CO 2 on TiO 2 under photoillumination at room temperature. CO and CHCl 3 were formed from C 2HCl 3 alone and CCl 4 from C 2Cl 4 alone. The decay rates of C 2HCl 3 and C 2Cl 4 as well as the formation rates of products varied with reaction conditions of relative humidity, light intensity and concentrations of C 2HCl 3, C 2Cl 4 or O '. C 2HCl 3 and C 2Cl 4 displayed roughly the same decay rate under dry conditions. Under humid conditions, the reaction rates decreased, particularly for C 2Cl 4. In the heterogeneous photochemical reactions, O 2 −, Cl and OH are considered the active chemical species, from analogy with the data reported for the gas-phase and liquid-phase reactions.
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