Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes

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 R...

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Principais autores: Moura, Dayanne Chianca de, Brito, Chrystiane do Nascimento, Quiroz, Marco Antonio, Pergher, Sibele Berenice Castellã, Martinez-Huitle, Carlos Alberto
Formato: article
Idioma:English
Publicado em: Elsevier
Assuntos:
Oxygen evolution reaction
Polarization curves
Diamond electrode
Real effluent
Hydroxyl radicals
Active chlorine
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/29639
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spelling ri-123456789-296392021-09-27T14:01:27Z Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes Moura, Dayanne Chianca de Brito, Chrystiane do Nascimento Quiroz, Marco Antonio Pergher, Sibele Berenice Castellã Martinez-Huitle, Carlos Alberto Oxygen evolution reaction Polarization curves Diamond electrode Real effluent Hydroxyl radicals Active chlorine 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 2020-07-15T03:14:53Z 2020-07-15T03:14:53Z 2015-12 article 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: https://www.sciencedirect.com/science/article/abs/pii/S2214714414001299. Acesso em 14 jul. 2020. https://doi.org/10.1016/j.jwpe.2014.11.005 2214-7144 https://repositorio.ufrn.br/jspui/handle/123456789/29639 10.1016/j.jwpe.2014.11.005 en Attribution 3.0 Brazil Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ http://creativecommons.org/licenses/by/3.0/br/ application/pdf Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic Oxygen evolution reaction
Polarization curves
Diamond electrode
Real effluent
Hydroxyl radicals
Active chlorine
spellingShingle Oxygen evolution reaction
Polarization curves
Diamond electrode
Real effluent
Hydroxyl radicals
Active chlorine
Moura, Dayanne Chianca de
Brito, Chrystiane do Nascimento
Quiroz, Marco Antonio
Pergher, Sibele Berenice Castellã
Martinez-Huitle, Carlos Alberto
Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes
description 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
format article
author Moura, Dayanne Chianca de
Brito, Chrystiane do Nascimento
Quiroz, Marco Antonio
Pergher, Sibele Berenice Castellã
Martinez-Huitle, Carlos Alberto
author_facet Moura, Dayanne Chianca de
Brito, Chrystiane do Nascimento
Quiroz, Marco Antonio
Pergher, Sibele Berenice Castellã
Martinez-Huitle, Carlos Alberto
author_sort Moura, Dayanne Chianca de
title Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes
title_short Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes
title_full Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes
title_fullStr Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes
title_full_unstemmed Cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes
title_sort cl-mediated electrochemical oxidation for treating an effluent using platinum and diamond anodes
publisher Elsevier
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/29639
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