摘要
In this paper, the oxidative degradation of 2, 4-dichlor- ophenoxyacetic acid （2, 4-D） using Mn2＋/H2O2 reagent under UV irradiation was studied. The results show that 2, 4-D was degraded more completely in Mn〉/H2O2 solution than traditional Fenton solutions. The effects of the concentration of Mn2＋, H2O2 and pH were also investigated. And under the optimal condition of CMn2＋ 1.48×10^-4mol/L, CH2O2 8.99×10^-5mol/L and pH 3.38, the formation of .OH was the most, both the decomposition rate of H202 and the degradation rate of 2, 4-D were the fastest. In addi- tion, the photoreaction process was monitored using spin-trapping electron paramagnetic resonance （EPR）, and the results indicated that the oxidative process was predominated mainly by the hydroxyl radical （＊ OH） gennerated in the system.
In this paper, the oxidative degradation of 2, 4-dichlor- ophenoxyacetic acid （2, 4-D） using Mn2＋/H2O2 reagent under UV irradiation was studied. The results show that 2, 4-D was degraded more completely in Mn〉/H2O2 solution than traditional Fenton solutions. The effects of the concentration of Mn2＋, H2O2 and pH were also investigated. And under the optimal condition of CMn2＋ 1.48×10^-4mol/L, CH2O2 8.99×10^-5mol/L and pH 3.38, the formation of .OH was the most, both the decomposition rate of H202 and the degradation rate of 2, 4-D were the fastest. In addi- tion, the photoreaction process was monitored using spin-trapping electron paramagnetic resonance （EPR）, and the results indicated that the oxidative process was predominated mainly by the hydroxyl radical （＊ OH） gennerated in the system.
基金
Supported by the National Basic Research Program of China (973 Program) (2008CB417206)
the National Natural Science Foundation of China (20877048)
Hydrology and National Key Laboratory Open Funds of Water Resources and Hydraulic Engineering Science(2006412311)
