Comparison of different chlorophenols degradation in aqueous solutions by gamma irradiation under reducing conditions

The reductive degradation of chlorophenols (CPs), including 2-CP, 4-CP and 2,4-DCP by gamma irradiation was investigated and compared. The results showed that the most efficient degradation took place with 2,4-DCP, followed by 2-CP and then 4-CP. This confirmed that the number and position of chlorine atoms existing in the benzene ring have significant impact on dechlorination and decomposition of CPs. The G-values of decomposition of CPs, the formation of intermediate products and chloride ion, and the degradation rate (KCPs and KCl−1KCl−1) were also determined.

► Reductive degradation of 2-CP, 4-CP and 2,4-DCP by γ radiation was compared.
► Number and position of chlorine affect their dechlorination and decomposition.
► G-values of CPs decomposition, intermediate formation and chloride release were determined.