[Radiolysis of chlorophenols in aqueous solution by gamma ray]

The radiolytic degradation of chlorophenols (CPs) in aqueous solutions by gamma-radiation was studied. The effects of absorbed dose, different type of chlorophenol and their initial concentration on the degradation and dechlorination of CPs were investigated. The experimental results showed that gamma-irradiation was able to degrade CPs in aqueous solution successfully, and the radiolytic degradation of CPs was in accordance with the pseudo-first-order kinetic model. When the initial concentration of CPs was 100 mg x L(-1) and the radiation dose was 8 kGy, the removal efficiencies of 2-CP, 3-CP, 4-CP, 2,4-DCP were 68.0%, 97.5%, 89.7% and 100% respectively. The corresponding dechlorination efficiencies were 60.2%, 71.1%, 64.3% and 78.9%, respectively. The combination of radiation and O3/H2O2 resulted in a synergistic effect, which remarkably increased the degradation and mineralization efficiency of CPs.