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Influence of chelation on the Fenton-based electrochemical degradation of herbicide tebuthiuron.
Chemosphere. 2018 May; 199:709-717.C

Abstract

This study describes the performance of electro-Fenton (EF) and photoelectro-Fenton (PEF) processes to degrade the herbicide tebuthiuron (TBH) in 0.050 M Na2SO4 at pH = 3.0. Experiments were performed in an undivided cell equipped with a boron-doped diamond (BDD) or Pt anode and an air-diffusion cathode that produces H2O2. Physisorbed hydroxyl radicals (M(OH)) generated from water oxidation at the anode and/or free OH formed from Fenton's reaction acted as main oxidants. All processes became much more effective using a BDD anode because of the higher oxidation power of BDD(OH). Sulfate and nitrate were the predominant ions released during TBH destruction. In both, EF and PEF treatments, two distinct kinetic regimes were observed, the first one corresponding to the oxidation of free TBH by OH and the second one to that of the Fe(III)-TBH complex by M(OH). The effect of Fe2+ and TBH concentrations on the kinetics of both regions has been examined. Moreover, a poor mineralization was reached with Pt anode, whereas almost total mineralization was attained by EF and PEF with BDD. Both processes showed analogous mineralization rates because the intermediates produced could not be photodegraded by UVA light. Gas chromatography-mass spectrometry analysis of electrolyzed solutions revealed the generation of eight heteroaromatics along with 1,3-dimethylurea, which have been included in a reaction pathway proposed for the initial degradation of TBH.

Authors+Show Affiliations

Instituto de Química (INQUI), Universidade Federal de Mato Grosso do Sul, Av. Senador Filinto Muller, 1555, Caixa postal 549, MS 79070-900, Campo Grande, Brazil.Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain. Electronic address: i.sires@ub.edu.Instituto de Química (INQUI), Universidade Federal de Mato Grosso do Sul, Av. Senador Filinto Muller, 1555, Caixa postal 549, MS 79070-900, Campo Grande, Brazil.Instituto de Química (INQUI), Universidade Federal de Mato Grosso do Sul, Av. Senador Filinto Muller, 1555, Caixa postal 549, MS 79070-900, Campo Grande, Brazil.Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain. Electronic address: brillas@ub.edu.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29471241

Citation

Gozzi, Fábio, et al. "Influence of Chelation On the Fenton-based Electrochemical Degradation of Herbicide Tebuthiuron." Chemosphere, vol. 199, 2018, pp. 709-717.
Gozzi F, Sirés I, de Oliveira SC, et al. Influence of chelation on the Fenton-based electrochemical degradation of herbicide tebuthiuron. Chemosphere. 2018;199:709-717.
Gozzi, F., Sirés, I., de Oliveira, S. C., Machulek, A., & Brillas, E. (2018). Influence of chelation on the Fenton-based electrochemical degradation of herbicide tebuthiuron. Chemosphere, 199, 709-717. https://doi.org/10.1016/j.chemosphere.2018.02.060
Gozzi F, et al. Influence of Chelation On the Fenton-based Electrochemical Degradation of Herbicide Tebuthiuron. Chemosphere. 2018;199:709-717. PubMed PMID: 29471241.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of chelation on the Fenton-based electrochemical degradation of herbicide tebuthiuron. AU - Gozzi,Fábio, AU - Sirés,Ignasi, AU - de Oliveira,Silvio César, AU - Machulek,Amílcar,Jr AU - Brillas,Enric, Y1 - 2018/02/12/ PY - 2018/01/03/received PY - 2018/01/27/revised PY - 2018/02/08/accepted PY - 2018/2/23/pubmed PY - 2018/6/30/medline PY - 2018/2/23/entrez KW - Electro-Fenton KW - Electrochemical oxidation KW - Iron complexes KW - Oxidation products KW - Photoelectro-Fenton KW - Tebuthiuron SP - 709 EP - 717 JF - Chemosphere JO - Chemosphere VL - 199 N2 - This study describes the performance of electro-Fenton (EF) and photoelectro-Fenton (PEF) processes to degrade the herbicide tebuthiuron (TBH) in 0.050 M Na2SO4 at pH = 3.0. Experiments were performed in an undivided cell equipped with a boron-doped diamond (BDD) or Pt anode and an air-diffusion cathode that produces H2O2. Physisorbed hydroxyl radicals (M(OH)) generated from water oxidation at the anode and/or free OH formed from Fenton's reaction acted as main oxidants. All processes became much more effective using a BDD anode because of the higher oxidation power of BDD(OH). Sulfate and nitrate were the predominant ions released during TBH destruction. In both, EF and PEF treatments, two distinct kinetic regimes were observed, the first one corresponding to the oxidation of free TBH by OH and the second one to that of the Fe(III)-TBH complex by M(OH). The effect of Fe2+ and TBH concentrations on the kinetics of both regions has been examined. Moreover, a poor mineralization was reached with Pt anode, whereas almost total mineralization was attained by EF and PEF with BDD. Both processes showed analogous mineralization rates because the intermediates produced could not be photodegraded by UVA light. Gas chromatography-mass spectrometry analysis of electrolyzed solutions revealed the generation of eight heteroaromatics along with 1,3-dimethylurea, which have been included in a reaction pathway proposed for the initial degradation of TBH. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/29471241/Influence_of_chelation_on_the_Fenton_based_electrochemical_degradation_of_herbicide_tebuthiuron_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(18)30262-5 DB - PRIME DP - Unbound Medicine ER -