Degradation of diuron by the electro-Fenton process
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The degradation of the herbicide diuron has been undertaken by electrochemical advanced oxidation in aqueous solution. This process generates catalytically hydroxyl radicals that are strong oxidizing reagents for the oxidation of organic substances. Hydroxyl radicals degrade diuron in less than 10 min. Kinetic results evidence a pseudo-first-order degradation, with a rate constant of reaction between diuron and hydroxyl radicals of 4.8x109 M−1 s−1. Several degradation products were identified by chromatography-mass spectrometry (LC-MS). The mineralization degree of a 1.7x10−4 M diuron solution reached 93% at 1,000 coulombs.
KeywordsDiuron Electro-Fenton Hydroxyl radical Mineralization Mass spectrometry
- Djebbar K, Sehili T, Mazellier P, De Laat J (2003) Phototransformation of diuron in aqueous solution by UV irradiation in the absence and in the presence of H2O2. Environ Tech 24:479–489Google Scholar
- Oturan MA (2000) An ecologically effective water treatment technique using electrochemically generated hydroxyl radicals for in situ destruction of organic pollutants: application to herbicide 2,4-D. J Appl Electrochem 30:475–482Google Scholar
- Ramirez Zamora R, Seux R (1999) Identification of diuron radical oxidation by products. Rev Sci Eau 12:545–560Google Scholar
- Tomlin CDS (1997) The pesticide manual, 11th edn. British Crop Protection Council, Farnham, UKGoogle Scholar