Application of the electro-Fenton process to mesotrione aqueous solutions: Kinetics, degradation pathways, mineralization and evolution of the toxicity

Journal
Macedonian Journal of Chemistry and Chemical Engineering
Date Issued
2014-06-15
Author(s)
Murati, Minir
Oturan, Nihal
Petreska Stanoeva, Jasmina
Efremova Aaron, Snezhana
Aaron, Jean-Jacques
Oturan, Mehmet A.
DOI
10.20450/mjcce.2014.407
Abstract
<jats:p><p>The kinetics and the mechanism of degradation of the mesotrione herbicide by three electrochemical advanced oxidation processes (EAOPs) systems, namely electro-Fenton (EF) with Pt anode (EF-Pt), anodic oxidation with BDD anode (AO) and EF-boron doped diamond anode (EF-BDD), were investigated in acidic aqueous solutions. The degradation of mesotrione obeyed apparent first-order reaction kinetics, and its absolute rate constant value with hydroxyl radicals at pH 3.0, determined by the competitive kinetics method, was found to be 8.20 × 10<sup>8</sup> L mol<sup>–1</sup> s<sup>–1</sup>. Fourteen different mesotrione degradation products were separated and/or identified using HPLC / MS<sup>n</sup> analyses. A rationalized scheme was proposed for the reaction pathways of mesotrione degradation in the EF process. The mesotrione mineralization yield values ranged between about 58 and 97% for a 6-h electrolysis time, according to the type of EAOP system and the electrolysis current intensity value. The evolution of the toxicity of mesotrione aqueous solutions with electrolysis time (t) was investigated during treatment by the EF-Pt and EF-BDD systems. Toxicity was measured with the Microtox® method, based on the luminescence inhibition of marine bacteria Vibrio fischeri. The curves % inhibition vs. time were found to depend on the toxicity of formed mesotrione degradation products.</p></jats:p>
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M. Murati, N. Oturan, Z. Zdravkovski, J. Petreska Stanoeva, S. Efremova Aaron, J.J. Aaron, M.A. Oturan, Application of the electro-Fenton process to mesotrione aqueous 2143. B. Balabanova, T. Stafilov, R. Šajn, K. Bačeva, Variability assessment of metals distributions due to anthropogenic and geogenic impact in the lead-zinc mine and flotation „zletovo” environs (moss biomonitoring), Geologica Macedonica, 28(2) 101–114 (2014) 290 solutions: kinetics, degradation pathways, mineralization, and evolution of toxicity, Macedonian Journal of Chemistry and Chemical Engineering, 33, 121–137 (2014).
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