Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation

In this work, the removal of Procion Red MX-5B dye by electrochemical oxidation with boron doped diamond (BDD) anodes was investigated. The impact of current density, flow rate, initial pH, and supporting electrolyte was evaluated on dye and organic matter removal. Furthermore, the use of dimensiona...

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Authors: Cotillas, Salvador, Llanos López, Javier, Cañizares Cañizares, Pablo, Clematis, Davide, Ceerisola, Giacomo, Rodrigo Rodrigo, Manuel Andrés, Panizza, Marco
Format: article
Publication Date:2018
Country:España
Institution:Universidad de Castilla-La Mancha
Repository:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/17554
Online Access:http://hdl.handle.net/10578/17554
Access Level:Open access
Keyword:Electrolysis
Procion red dye
Hydroxyl radical
BDD
DSA
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spelling Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidationCotillas, SalvadorLlanos López, JavierCañizares Cañizares, PabloClematis, DavideCeerisola, GiacomoRodrigo Rodrigo, Manuel AndrésPanizza, MarcoElectrolysisProcion red dyeHydroxyl radicalBDDDSAIn this work, the removal of Procion Red MX-5B dye by electrochemical oxidation with boron doped diamond (BDD) anodes was investigated. The impact of current density, flow rate, initial pH, and supporting electrolyte was evaluated on dye and organic matter removal. Furthermore, the use of dimensionally stable anodes (DSA) was tested to evaluate process performance. Results show that after 240 min, it is possible to achieve full dye and COD (Chemical Oxygen Demand) removal, regardless of applied current density. This is due to the generation of powerful oxidants – i.e. hydroxyl radicals and peroxodisulfate–, which attack the organic matter in the wastewater, promoting its complete degradation. However, process efficiency increases when using lower current densities (10 mA cm−2): electric charges of about 5 Ah dm−3 are sufficient to fully remove both dye and COD, while charges higher than 15 Ah dm−3 are required when working at higher current densities (>30 mA cm−2). This fact is related to the production of large amounts of hydroxyl radicals, which are wasted in other reactions at higher current densities. On the other hand, higher flow rates (300 dm3 h−1) promote Procion Red MX-5B and organic matter degradation, due to improved mass transfer within the system. Regarding the impact of initial pH on dye removal, no significant differences were observed. Conversely, COD is clearly affected by this parameter: it is only possible to fully remove the organic matter when working at natural pH. Finally, with DSA anodes, higher dye removal efficiencies are attained than with BDD electrodes, when 100 mg dm−3 chlorides are added to the supporting electrolyte. Likewise, higher chloride concentration (100–1000 mg dm−3) was observed to enhance process efficiency when using DSA as anode material. However, during electrolysis with both BDD and DSA, chloride ions in the supporting electrolyte promote the production of intermediate organochlorinated compounds. Therefore, under these conditions, no full organic matter removal can be achieved, regardless of the anode material employed.Elsevier201820182018info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://hdl.handle.net/10578/17554reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésinfo:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/175542026-05-27T07:36:41Z
dc.title.none.fl_str_mv Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation
title Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation
spellingShingle Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation
Cotillas, Salvador
Electrolysis
Procion red dye
Hydroxyl radical
BDD
DSA
title_short Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation
title_full Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation
title_fullStr Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation
title_full_unstemmed Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation
title_sort Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation
dc.creator.none.fl_str_mv Cotillas, Salvador
Llanos López, Javier
Cañizares Cañizares, Pablo
Clematis, Davide
Ceerisola, Giacomo
Rodrigo Rodrigo, Manuel Andrés
Panizza, Marco
author Cotillas, Salvador
author_facet Cotillas, Salvador
Llanos López, Javier
Cañizares Cañizares, Pablo
Clematis, Davide
Ceerisola, Giacomo
Rodrigo Rodrigo, Manuel Andrés
Panizza, Marco
author_role author
author2 Llanos López, Javier
Cañizares Cañizares, Pablo
Clematis, Davide
Ceerisola, Giacomo
Rodrigo Rodrigo, Manuel Andrés
Panizza, Marco
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Electrolysis
Procion red dye
Hydroxyl radical
BDD
DSA
topic Electrolysis
Procion red dye
Hydroxyl radical
BDD
DSA
description In this work, the removal of Procion Red MX-5B dye by electrochemical oxidation with boron doped diamond (BDD) anodes was investigated. The impact of current density, flow rate, initial pH, and supporting electrolyte was evaluated on dye and organic matter removal. Furthermore, the use of dimensionally stable anodes (DSA) was tested to evaluate process performance. Results show that after 240 min, it is possible to achieve full dye and COD (Chemical Oxygen Demand) removal, regardless of applied current density. This is due to the generation of powerful oxidants – i.e. hydroxyl radicals and peroxodisulfate–, which attack the organic matter in the wastewater, promoting its complete degradation. However, process efficiency increases when using lower current densities (10 mA cm−2): electric charges of about 5 Ah dm−3 are sufficient to fully remove both dye and COD, while charges higher than 15 Ah dm−3 are required when working at higher current densities (>30 mA cm−2). This fact is related to the production of large amounts of hydroxyl radicals, which are wasted in other reactions at higher current densities. On the other hand, higher flow rates (300 dm3 h−1) promote Procion Red MX-5B and organic matter degradation, due to improved mass transfer within the system. Regarding the impact of initial pH on dye removal, no significant differences were observed. Conversely, COD is clearly affected by this parameter: it is only possible to fully remove the organic matter when working at natural pH. Finally, with DSA anodes, higher dye removal efficiencies are attained than with BDD electrodes, when 100 mg dm−3 chlorides are added to the supporting electrolyte. Likewise, higher chloride concentration (100–1000 mg dm−3) was observed to enhance process efficiency when using DSA as anode material. However, during electrolysis with both BDD and DSA, chloride ions in the supporting electrolyte promote the production of intermediate organochlorinated compounds. Therefore, under these conditions, no full organic matter removal can be achieved, regardless of the anode material employed.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10578/17554
url http://hdl.handle.net/10578/17554
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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