Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion

The degradation of 2.5 L of Acid Yellow 36 solutions at pH 3.0 by electro-oxidation (EO) has been studied in a flow plant with a reactor containing an Ir-Sn-Sb oxide anode and a stainless steel cathode. The anode was prepared onto Ti by the Pechini method and characterized by SEM-EDX and XRD. It sho...

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Autores: Aguilar, Zaira G., Brillas, Enric, Salazar, Mercedes, Nava, José L., Sirés Sadornil, Ignacio
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2017
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/153318
Acceso en línea:https://hdl.handle.net/2445/153318
Access Level:acceso abierto
Palabra clave:Oxidació electroquímica
Depuració de l'aigua
Electrolytic oxidation
Water purification
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spelling Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ionAguilar, Zaira G.Brillas, EnricSalazar, MercedesNava, José L.Sirés Sadornil, IgnacioOxidació electroquímicaDepuració de l'aiguaElectrolytic oxidationWater purificationThe degradation of 2.5 L of Acid Yellow 36 solutions at pH 3.0 by electro-oxidation (EO) has been studied in a flow plant with a reactor containing an Ir-Sn-Sb oxide anode and a stainless steel cathode. The anode was prepared onto Ti by the Pechini method and characterized by SEM-EDX and XRD. It showed a certain ability to electrocatalyze both, the generation of adsorbed ¿OH from water oxidation in sulfate medium and, more largely, the production of active chlorine in a mixed electrolyte containing Cl- ion. The EO treatment of the dye solution in the latter medium led to a rapid decolorization because active chorine destroyed the colored by-products formed, but color removal was much slower in pure NaClO4 or Na2SO4 due to the limited formation of ¿OH. In contrast, greater mineralization was obtained in both pure electrolytes since the by-products formed in the presence of Cl- became largely persistent. The effect of liquid flow rate, current density and dye content on the EO performance in the mixed electrolyte was examined. The drop of absorbance and dye concentration obeyed a pseudo-first-order kinetics. Interestingly, the decolorization rate, dye concentration decay and TOC removal were enhanced upon catalysis with 1.0 mM Fe2+. Such better performance can be accounted for by the formation of ¿OH in the bulk from the electro-Fenton-like reaction between electrogenerated HClO and added Fe2+. Even larger mineralization was achieved by the photoelectro-Fenton-like process upon irradiation of the solution with UVA light due to photolysis of some refractory intermediates. Maleic and acetic acids were detected as final short-chain linear carboxylic acids. The loss of Cl- and the formation of ClO3-, ClO4-, SO42-, NO3- and NH4+ were evaluated as well.Elsevier B.V.2020202020172020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion9 p.application/pdfhttps://hdl.handle.net/2445/153318Articles publicats en revistes (Ciència dels Materials i Química Física)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.apcatb.2017.01.006Applied Catalysis B-Environmental, 2017, vol. 206, p. 44-52https://doi.org/10.1016/j.apcatb.2017.01.006cc-by-nc-nd (c) Elsevier B.V., 2017http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1533182026-05-29T05:05:01Z
dc.title.none.fl_str_mv Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion
title Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion
spellingShingle Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion
Aguilar, Zaira G.
Oxidació electroquímica
Depuració de l'aigua
Electrolytic oxidation
Water purification
title_short Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion
title_full Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion
title_fullStr Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion
title_full_unstemmed Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion
title_sort Evidence of Fenton-like reaction with active chlorine during the electrocatalytic oxidation of Acid Yellow 36 azo dye with Ir-Sn-Sb oxide anode in the presence of iron ion
dc.creator.none.fl_str_mv Aguilar, Zaira G.
Brillas, Enric
Salazar, Mercedes
Nava, José L.
Sirés Sadornil, Ignacio
author Aguilar, Zaira G.
author_facet Aguilar, Zaira G.
Brillas, Enric
Salazar, Mercedes
Nava, José L.
Sirés Sadornil, Ignacio
author_role author
author2 Brillas, Enric
Salazar, Mercedes
Nava, José L.
Sirés Sadornil, Ignacio
author2_role author
author
author
author
dc.subject.none.fl_str_mv Oxidació electroquímica
Depuració de l'aigua
Electrolytic oxidation
Water purification
topic Oxidació electroquímica
Depuració de l'aigua
Electrolytic oxidation
Water purification
description The degradation of 2.5 L of Acid Yellow 36 solutions at pH 3.0 by electro-oxidation (EO) has been studied in a flow plant with a reactor containing an Ir-Sn-Sb oxide anode and a stainless steel cathode. The anode was prepared onto Ti by the Pechini method and characterized by SEM-EDX and XRD. It showed a certain ability to electrocatalyze both, the generation of adsorbed ¿OH from water oxidation in sulfate medium and, more largely, the production of active chlorine in a mixed electrolyte containing Cl- ion. The EO treatment of the dye solution in the latter medium led to a rapid decolorization because active chorine destroyed the colored by-products formed, but color removal was much slower in pure NaClO4 or Na2SO4 due to the limited formation of ¿OH. In contrast, greater mineralization was obtained in both pure electrolytes since the by-products formed in the presence of Cl- became largely persistent. The effect of liquid flow rate, current density and dye content on the EO performance in the mixed electrolyte was examined. The drop of absorbance and dye concentration obeyed a pseudo-first-order kinetics. Interestingly, the decolorization rate, dye concentration decay and TOC removal were enhanced upon catalysis with 1.0 mM Fe2+. Such better performance can be accounted for by the formation of ¿OH in the bulk from the electro-Fenton-like reaction between electrogenerated HClO and added Fe2+. Even larger mineralization was achieved by the photoelectro-Fenton-like process upon irradiation of the solution with UVA light due to photolysis of some refractory intermediates. Maleic and acetic acids were detected as final short-chain linear carboxylic acids. The loss of Cl- and the formation of ClO3-, ClO4-, SO42-, NO3- and NH4+ were evaluated as well.
publishDate 2017
dc.date.none.fl_str_mv 2017
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/153318
url https://hdl.handle.net/2445/153318
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.apcatb.2017.01.006
Applied Catalysis B-Environmental, 2017, vol. 206, p. 44-52
https://doi.org/10.1016/j.apcatb.2017.01.006
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier B.V., 2017
http://creativecommons.org/licenses/by-nc-nd/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier B.V., 2017
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 9 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Ciència dels Materials i Química Física)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812429

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