EFFECT OF HYDROGEN PEROXIDE, PERIODATE AND PERSULFATE ON PHOTOCATALYSIS OF 2- CHLOROBIPHENYL IN AQUEOUS TiO2 SUSPENSIONS

摘要

Decomposition of 2-chlorobiphenyl (2-CB) in the systems of UV/TiO2, UV/oxidant and UV/ TiO2/oxidant (i.e. H2O2, S2O~2-_8 and IO~-_4), were investigated. The addition of inorganic oxidants to the UV/TiO2 system showed no rate-enhancing effects for the degradation of 2-CB with oxidant concen- tration of 10-3 and 10-2 M and TiO2. concentration of 25 mg/l. The negative effect of oxidants on the heterogeneous oxidation was demonstrated. Homogeneous photooxidation seems to dominate over the parallel heterogeneous process when both TiO2 and oxidants are present.