Photocatalytic Degradation and Reaction Pathway Studies of Chlorinated Hydrocarbons in Gaseous Phase


1 Department of Chemistry,Kuwait University

2 Department of Chemistry,University of Mashad


TiO2 was doped with various types of rst row transition metals towards the degradation of
dichloromethane, chloroform, carbon tetrachloride and a mixture of carbon tetrachloride and chloroform.
Zn2+/Fe3+/TiO2 photocatalyst with the ratio of 0.0005: 0.0005: 1 was revealed as the best catalyst in
this study. 41.05% of dichloromethane, 49.45% of chloroform and 37.84% of carbon tetrachloride were
degraded by this catalyst in the presence of UV light (6 W, 354 nm), irradiated for 90 minutes, and oxidized
VOCs gases were analyzed using GC-FID. In this study, the new species of CHCl+2 , CH2Cl+, CCl+2 and
OCl+. CHCl+2 was detected to form from the photocatalytic degradation of chloroform while some new
fragments, such as OCl+, CHCl+2 and CH2Cl+, are observed during the photocatalytic degradation of
carbon tetrachloride.