Removal of methyl parathion from water by electrochemically generated Fenton's reagent.
The electro-Fenton process was used to assess the degradation of methyl parathion (MP) in aqueous solutions. This oxidation process allows the production of hydroxyls radicals which react on the organic compounds, leading to their mineralization. Degradation experiments were performed either in perchloric, sulphuric, hydrochloric and nitric acid media under current controlled electrolysis conditions at different pH. The pH effect as well as the nature of the medium (i.e., the nature of the ions present in medium) on the degradation and mineralization efficiency were studied. The mineralization of the initial pollutant was investigated by total organic carbon measurements which show a complete mineralization at pH 3 in perchloric medium. The absolute rate constant of MP hydroxylation reaction was determined as (4.20+/-0.11)x10(9)M(-1)s(-1). Complete degradation of MP and its metabolites occur in less than 45min. Degradation reaction intermediates such as aromatic compounds, carboxylic acids and inorganic ions were identified and a mineralization pathway is proposed.
Diagne
Mababa
M
Université de Marne la Vallée, Laboratoire des Géomatériaux et Géologie de l'Ingénieur, 5 Boulevard Descartes, Champs-sur-Marne, 77454 Marne-la-Vallée Cedex 2, France.
Oturan
Nihal
N
Oturan
Mehmet A
MA
D002244:Carbon / Q000032:analysis; D004572:Electrolysis; D006851:Hydrochloric Acid / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008743:Methyl Parathion / Q000737:chemistry*; D017942:Nitric Acid / Q000737:chemistry; D010472:Perchlorates / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
C045076:Fenton's reagent; D010472:Perchlorates; D013464:Sulfuric Acids; D014874:Water Pollutants, Chemical; D017942:Nitric Acid; D008743:Methyl Parathion; D002244:Carbon; D006861:Hydrogen Peroxide; D007501:Iron; C033158:sulfuric acid; D006851:Hydrochloric Acid