Electrochemical oxidation of methyl orange azo dye at pilot flow plant using BDD technology |
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Authors: | Cecilia Ramírez Adriana Saldaña Berenice Hernández Roberto Acero Ricardo Guerra Sergi Garcia-Segura Enric Brillas Juan M Peralta-Hernández |
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Affiliation: | 1. Centro de Innovación Aplicada en Tecnologías Competitivas (CIATEC), Investigación Ambiental, Omega-201, Fraccionamiento Industrial Delta, 37545 León, Guanajuato, Mexico;2. Laboratori d’Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Spain |
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Abstract: | Solutions of methyl orange azo dye were degraded by electrochemical oxidation using a 3 L flow plant with a boron-doped diamond (BDD)/stainless steel cell operating at constant current density, ambient temperature and liquid flow rate of 12 L min?1. A 23 factorial design considering the applied current density, azo dye concentration and electrolysis time as variable independents was used to analyze the process by response surface methodology. LC–MS analysis revealed the formation of seven oxidation products from the cleavage of the N N group of the dye, followed by deamination, formation of a nitro group and/or desulfonation of the resulting aromatics. |
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