New Photochemical and Electrochemical Methods for the Degradation of Pesticides in Aqueous media. Environmental Applications

Authors : Jean Jacques Aaron

Pages : 509-520

View : 14 | Download : 8

Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :The development of new electrochemical and photochemical methods for the decontamination of natural water containing significant concentrations of aromatic pesticides is described. The electrochemical method is based on the electro-Fenton process, i.e. the simultaneous reduction of O2 and Fe3+ ions. Hydroxyl (OH.) radicals are electrosynthesized in aqueous solutions, followed by complete mineralization of the initial pollutants. The photochemical methods involve either a direct photodegradation reaction of pesticides by UV light, or indirect photodegradation processes including H2O2 photolysis or photo-Fenton reagents (H2O2/ Fe3+ ). Examples of the application of these methods to chlorophenoxy acid herbicides and four aromatic pesticides (bendiocarb, pirimiphos-methyl, coumatetralyl, chlorophacinon) in aqueous media are given. Environmental applications are also presented. The performances of electrochemical and photochemical methods are compared.
Keywords : electro-Fenton method, photo-Fenton method, pesticides, water treatment.