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Title: Degradation of the insecticide propoxur by electrochemical advanced oxidation processes using a boron-doped diamond/air-diffusion cell
Author: Guelfi, Diego Roberta de Vieira
Gozzi, Fábio
Sirés Sadornil, Ignacio
Brillas, Enric
Machulek Jr., Amílcar
De Oliveira, Silvio César
Keywords: Oxidació electroquímica
Electrolytic oxidation
Issue Date: 1-Mar-2017
Publisher: Springer Verlag
Abstract: A solution with 0.38 mM of the pesticide propoxur (PX) at pH 3.0 has been comparatively treated by electrochemical oxidation with electrogenerated H2O2 (EO-H2O2), electro-Fenton (EF) and photoelectro-Fenton (PEF). The trials were carried out with a 100 mL boron-doped diamond (BDD)/air-diffusion cell. The EO-H2O2 process had the lowest oxidation ability due to the slow reaction of intermediates with ¿OH produced from water discharge at the BDD anode. The EF treatment yielded quicker mineralization due to the additional ¿OH formed between added Fe2+ and electrogenerated H2O2. The PEF process was the most powerful since it led to total mineralization by the combined oxidative action of hydroxyl radicals and UVA irradiation. The PX decay agreed with a pseudo-first-order kinetics in EO-H2O2, whereas in EF and PEF it obeyed a much faster pseudo-first-order kinetics followed by a much slower one, which are related to the oxidation of its Fe(II) and Fe(III) complexes, respectively. EO-H2O2 showed similar oxidation ability within the pH range 3.0-9.0. The effect of current density and Fe2+ and substrate contents on the performance of the EF process was examined. Two primary aromatic products were identified by LC-MS during PX degradation.
Note: Versió postprint del document publicat a:
It is part of: Environmental Science and Pollution Research, 2017, vol. 24, num. 7, p. 6083-6095
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ISSN: 0944-1344
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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