We study the photolytic degradation of planar (PCB 2, PCB 12, PCB 13, PCB 15) and non-planar (PCB 8, PCB 29, PCB 31) polychlorobiphenyls in an aqueous alcohol under UV irradiation (=240-320nm) at ambient temperature and atmospheric pressure for 25h on nanocrystalline TiO2 and CdS/TiO2. It is found that a conversion of PCB 2 (12.5%), PCB 12 (42.3%) and PCB 29 (98.0%) is more intense in the presence of the CdS/TiO2 composite, whereas mixture of the congeners PCB 8, PCB 13, PCB 15 and the congener PCB 31 can be photolyzed better in the presence of TiO2 with conversion 35.2% and 96.1%, respectively. The different conversions of the PCB congeners are explained considering the structures of the chloroaromatic radicals formed in situ as a result of the primary photolysis process and are confirmed by means of estimation of dipole moments calculated for singlet states of PCBs.
1.Russian Acad Sci, I Ya Postovskii Inst Organ Synth, Ural Branch, Kovalevskoy St 22, Ekaterinburg 620990, Russia 2.Russian Acad Sci, Ural Branch, Inst Solid State Chem, Pervomaiskaya St 91, Ekaterinburg 620990, Russia
Recommended Citation:
Gorbunova, Tatiana I.,Kozhevnikova, Natalia S.,Vorokh, Andrey S.,et al. Photolysis of polychlorobiphenyls in the presence of nanocrystalline TiO2 and CdS/TiO2[J]. REACTION KINETICS MECHANISMS AND CATALYSIS,2019-01-01,126(2):1115-1134