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Title: Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes
Authors: Moura, Dayanne Chianca de
Brito, Chrystiane do Nascimento
Quiroz, Marco Antonio
Pergher, Sibele Berenice Castellã
Martinez-Huitle, Carlos Alberto
Keywords: Oxygen evolution reaction;Polarization curves;Diamond electrode;Real effluent;Hydroxyl radicals;Active chlorine
Issue Date: Dec-2015
Publisher: Elsevier
Citation: MOURA, Dayanne Chianca de; BRITO, Chrystiane do Nascimento; QUIROZ, Marco Antonio; PERGHER, Sibele Berenice Castellã; MARTINEZ-HUITLE, Carlos A. Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes. Journal Of Water Process Engineering, [s.l.], v. 8, p. 31-36, dez. 2015. ISSN 2214-7144. Disponível em: Acesso em 14 jul. 2020.
Portuguese Abstract: In this work, the role of chloride with respect to the oxygen evolution reaction by using BDD and Pt/Ti anodes was investigated to understand the performance of both anodes for the electrochemical treatment of a real sample of wastewater, with lower organic load, generated at Federal University of Rio Grande do Norte. Bulk experiments were performed under real discharged effluent conditions (pH and conductivity) in order to verify the applicability of direct and mediated electrochemical oxidation by applying 2.5 and 5.0 mA cm−2. Results clearly showed that, a partial elimination of chemical oxygen demand (COD) was achieved, depending on applied current density. Using Pt/Ti, by applying 2.5 and 5.0 mA cm−2, COD removal efficiencies of 25.2% and 30.49% were obtained. Under the same conditions, a minor COD removal was achieved by using BDD electrode. However, the removal efficiencies were improved when Cl-mediated oxidation approach was employed, obtaining 63.7% and 60% for Pt/Ti by applying 2.5 and 5.0 mA cm−2, respectively; while for BDD electrode, COD removals were about 15% and 47%, under the same conditions. These figures are in agreement with the polarization curves obtained, where it was possible to confirm that the concentration of halide in solution increases the importance of Cl2/oxy-chloro radicals system depending on the electrocatalytic material and this behavior plays an important role in relation with the oxygen evolution reaction, influencing on the efficiency of electrochemical approach adopted
ISSN: 2214-7144
Appears in Collections:IQ - Artigos publicados em periódicos

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