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The Mechanistic and Oxidative Study of Methomyl and Parathion Degradation by Fenton Process
Abstract:The purpose of this study is to investigate the chemical degradation of the organophosphorus pesticide of parathion and carbamate insecticide of methomyl in the aqueous phase through Fenton process. With the employment of batch Fenton process, the degradation of the two selected pesticides at different pH, initial concentration, humic acid concentration, and Fenton reagent dosages was explored. The Fenton process was found effective to degrade parathion and methomyl. The optimal dosage of Fenton reagents (i.e., molar concentration ratio of H2O2 to Fe2+) at pH 7 for parathion degradation was equal to 3, which resulted in 50% removal of parathion. Similarly, the optimal dosage for methomyl degradation was 1, resulting in 80% removal of methomyl. This study also found that the presence of humic substances has enhanced pesticide degradation by Fenton process significantly. The mass spectroscopy results showed that the hydroxyl free radical may attack the single bonds with least energy of investigated pesticides to form smaller molecules which is more easily to degrade either through physio-chemical or bilolgical processes.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1071616Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1353
 R. S. Adams, "Factors influencing soil adsorption and bioactivity of pesticides," Residue Reviews, vol 47, pp. 1-54, 1973.
 W. D. Guenzi, J. L. Ahlrichs, M. E. Bloodworth, G. Chester, R. G. Nash, Pesticides in soil and water, Soil Science Society of America, Wisconsin, 562, 1974.
 E. Neyens, J. Baeyens, "A review of classic Fenton's peroxidation as an advanced oxidation technique," J. Hazard. Mater., vol. 98, pp. 33-55, 2003.
 R. J. Watts, M. D. Udell, P. A. Rauch, "Treatment of pentachlorophenolcontaminated soils using Fenton's reagent," Hazard. Waste Hazard. Mater., vol. 7, pp. 335-345, 1990.
 B. W. Tyre, R. J. Watts, G. C. Miller, "Treatment of four biorefractory contaminants in soil using catalyzed hydrogen peroxide," J. Environ. Qual., vol. 20, pp. 832-838, 1991.
 R. J. Watts, S. Kong, M. Dippre, W. T. Barnes, "Oxidation of sorbed hexachlorobenzene in soils using catalyzed hydrogen peroxide," J. Hazard. Mater., vol. 39, pp. 33-47, 1994.
 G. Chen, G. E. Hoag, P. Chedda, "The mechanism and applicability of in situ oxidation of trichloroethylene with Fenton's reagent," J. Hazard. Mater., vol. 87, pp. 171-86, 2001.
 D. D. Gates, R. L. Siegrist, "In-situ chemical oxidation of trichloroethylene using hydrogen peroxide," J. Environ. Eng.-Asce., vol. 121, pp. 639-44, 1995.
 B. Utset, J. Garcia, J. Casado, X. Domenech, J. Peral, "Replacement of H2O2 in Fenton and photo-Fenton reactions," Chemosphere, vol. 41, pp. 1187-92, 2000.
 G. W. vanLoon, S. J. Duffy, Environmental chemistry. New York: Oxford University Press, 2000. pp. 370-410.