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Title: Degradation of herbicide S-metolachlor by electrochemical AOPs using a boron-doped diamond anode
Author: Guelfi, Diego Roberta de Vieira
Gozzi, Fábio
Machulek Jr., Amílcar
Sirés Sadornil, Ignacio
Brillas, Enric
De Oliveira, Silvio César
Keywords: Oxidació electroquímica
Depuració d'aigües residuals
Electrolytic oxidation
Purification of sewage
Issue Date: 2018
Publisher: Elsevier B.V.
Abstract: The degradation and mineralization ability of electrochemical processes like electro-oxidation with electrogenerated H2O2 (EO-H2O2), electro-Fenton (EF) and UVA-assisted photoelectro-Fenton (PEF) has been comparatively studied for solutions of the herbicide S-metolachlor. Solutions of 100 mL have been treated using an undivided cell equipped with an air-diffusion cathode and a boron-doped diamond (BDD) anode. The effect of pH, current density, and Fe2+ and S-metolachlor concentration has been thoroughly studied. The total organic carbon removal profiles have demonstrated the feasibility of almost overall mineralization by EF and PEF after 9 h at 300 mA. The herbicide decays in both treatments informed about the complexation of Fe(III) ions formed from Fenton's reaction, which decelerated S-metolachlor removal. However, the high oxidation power of BDD anode allowed the gradual mineralization of such complexes. The identification of chlorinated and non-chlorinated degradation byproducts by GC-MS has allowed the proposal of main degradation routes.
Note: Versió postprint del document publicat a:
It is part of: Catalysis Today, 2018, vol. 313, p. 182-188
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ISSN: 0920-5861
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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