γ辐照降解水溶液中氯酚的研究

研究了水溶液中氯酚(2-氯酚、3-氯酚、4-氯酚、2,4-二氯酚)的γ辐照降解.通过测定辐照前后氯酚、氯离子浓度以及TOC的变化,考察了不同氯酚、不同初始浓度,以及联合O3、H2O2对辐解效果的影响.结果表明,γ辐照可有效降解水溶液中的氯酚,降解过程符合准一级动力学方程;初始浓度为100mag·L-1,辐照剂量为8kGy时,2-CP、3-CP、4-CP、2,4-DCP的去除率分别为68.0%、97.5%、89.7%和100%,相应的脱氯率分别为60.2%、71.1%、64.3%、78.9%;辐照联合O3或H2O2可有效提高辐照降解氯酚的去除和矿化效率,具有明显"协同效应".

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.