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Metomyl degradation by electro-Fenton and electro-Fenton-like processes: a kinetics study of the effect of the nature and concentration of some transition metal ions as catalyst.

Authors
  • Oturan, Nihal1
  • Zhou, Minghua
  • Oturan, Mehmet A
  • 1 Université Paris-Est Marne-la-Vallée, Laboratoire Géomatériaux et Environnement, 5 Boulevard Descartes, Marne-la-Vallée Cedex 2, France. , (France)
Type
Published Article
Journal
The Journal of Physical Chemistry A
Publisher
American Chemical Society
Publication Date
Oct 07, 2010
Volume
114
Issue
39
Pages
10605–10611
Identifiers
DOI: 10.1021/jp1062836
PMID: 20828190
Source
Medline
License
Unknown

Abstract

The oxidative degradation of insecticide metomyl as active ingredient and of its commercial formulation Lanate 20 L by an electro-Fenton process using a carbon felt cathode and iron ions as catalyst was compared with different transition metal ions such as, cobalt, silver, and copper as catalyst to produce hydroxyl radicals. The effect of catalyst nature and concentration on the degradation kinetics and COD removal was investigated and optimized. For all metal ions under study as catalyst, there is an optimal concentration value for degradation kinetics and solution COD removal efficiency. Fe(III) was confirmed to be the most efficient catalyst among the metals ions tested. The metomyl oxidative degradation was found to obey apparent first-order reaction kinetics, and the absolute rate constant of the oxidation between metomyl and hydroxyl radicals at pH 3.0 was obtained by competitive kinetics method, being 5.42 × 10(9) L mol(-1) s(-1).

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