Kinetic model and optimization of 2,4-D degradation by anodic Fenton treatment.
Anodic Fenton treatment (AFT) is a new technology derived from chemical Fenton treatment. It has several advantages as compared with classic Fenton treatment and electrochemical Fenton treatment. On the basis of assumptions about a second-order reaction between pesticides and hydroxyl radicals and about AFT technology, a new kinetic model was developed to accurately describe the degradation kinetics of 2,4-D and to quantitatively investigate the effect of operating conditions. 2,4-D (2,4-dichlorophenoxyacetic acid) was employed as a probe in this study to investigate the AFT system. It was found that an increased delivery rate of Fenton reagent increased the degradation rate of 2,4-D, but the efficiency was decreased. The effects of the H2O2:Fe2+ ratio, the temperature, the initial concentration of 2,4-D, and the presence of other organic compounds have also been investigated. Quantitative correlations have been established that allow the use of this technology as a controlled Fenton reaction to determine the reaction rate constants of other compounds with hydroxyl radicals easily and accurately.
Wang
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Graduate Field of Environmental Toxicology, TXA, Cornell University, Ithaca, New York 14853-4401, USA.
Lemley
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D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D012989:Soil Pollutants; D013696:Temperature; D014874:Water Pollutants, Chemical; D014876:Water Pollution / Q000517:prevention & control*
C045076:Fenton's reagent; D006540:Herbicides; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D015084:2,4-Dichlorophenoxyacetic Acid; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D007501:Iron