Abstract
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 (λ = 240–320 nm) at ambient temperature and atmospheric pressure for 25 h 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.
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Acknowledgements
The work was supported by Ministry of Education and Science of the Russian Federation (No. 075-00578-19-00, No. 0397-2019-0003).
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Gorbunova, T.I., Kozhevnikova, N.S., Vorokh, A.S. et al. Photolysis of polychlorobiphenyls in the presence of nanocrystalline TiO2 and CdS/TiO2. Reac Kinet Mech Cat 126, 1115–1134 (2019). https://doi.org/10.1007/s11144-019-01543-7
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DOI: https://doi.org/10.1007/s11144-019-01543-7