Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode

The chemical oxygen demand (COD) is a widely used parameter to evaluate the quality of water for industrial applications. Currently, the standardized method for COD analysis employs expensive and harmful reagents that require a special treatment for disposal upon use. The photoelectrocatalytic COD d...

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Autores: García-Ramírez, P., Pineda-Arellano, C.A., Millán-Ocampo, D.E., Álvarez-Gallegos, A., Sirés Sadornil, Ignacio, Silva-Martínez, Susana
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/206822
Acceso en línea:https://hdl.handle.net/2445/206822
Access Level:acceso abierto
Palabra clave:Fotocatàlisi
Electroquímica
Potassi
Photocatalysis
Electrochemistry
Potassium
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spelling Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanodeGarcía-Ramírez, P.Pineda-Arellano, C.A.Millán-Ocampo, D.E.Álvarez-Gallegos, A.Sirés Sadornil, IgnacioSilva-Martínez, SusanaFotocatàlisiElectroquímicaPotassiPhotocatalysisElectrochemistryPotassiumThe chemical oxygen demand (COD) is a widely used parameter to evaluate the quality of water for industrial applications. Currently, the standardized method for COD analysis employs expensive and harmful reagents that require a special treatment for disposal upon use. The photoelectrocatalytic COD detection, based on the photocatalytic activity of a reduced TiO<sub>2</sub> nanotube array photoanode (Ti|NT-TiO<sub>2</sub>) under supply of a low bias potential, represents a fast, cheap and eco-friendly alternative to the standard COD method (COD<sub>STD</sub>). Here, Ti|NT-TiO<sub>2</sub> was synthesized by the anodization method followed by heat treatment and electrochemical reduction. Potassium hydrogen phthalate, glucose and acetic acid were used as model organic compounds. The photoelectrocatalytic detection of COD (COD<sub>PEC</sub>) is based on the photoelectrocatalytic oxidation of target compounds on the surface of the reduced Ti|NT-TiO<sub>2</sub> under UV illumination. Photocurrent transients were recorded using chronocoulometry, and the net charge (Δ<em>q</em>) was plotted as a function of the theoretical COD (COD<sub>TH</sub>). A linear relationship was found between these two parameters regardless of the model compound. That relationship was used to determine the COD<sub>PEC</sub> for acetylsalicylic acid and Terasil Blue dye solutions at concentrations within the range of 0–15 mg L<sup>-1</sup>. A good agreement between COD<sub>PEC</sub> and COD<sub>STD</sub> was achieved. The limit of detection of the method was 3.6 mg L<sup>-1</sup> COD, with the linear range established from 0 to 50 mg L<sup>-1</sup>.Elsevier Ltd2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/206822Articles publicats en revistes (Ciència dels Materials i Química Física)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1016/j.electacta.2023.143710Electrochimica Acta, 2023, vol. 476, p. 1-9https://doi.org/10.1016/j.electacta.2023.143710cc-by-nc-nd (c) García-Ramírez, P. et al., 2023http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2068222026-05-27T06:46:51Z
dc.title.none.fl_str_mv Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode
title Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode
spellingShingle Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode
García-Ramírez, P.
Fotocatàlisi
Electroquímica
Potassi
Photocatalysis
Electrochemistry
Potassium
title_short Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode
title_full Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode
title_fullStr Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode
title_full_unstemmed Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode
title_sort Photoelectrocatalytic chemical oxygen demand analysis using a TiO<sub>2</sub> nanotube array photoanode
dc.creator.none.fl_str_mv García-Ramírez, P.
Pineda-Arellano, C.A.
Millán-Ocampo, D.E.
Álvarez-Gallegos, A.
Sirés Sadornil, Ignacio
Silva-Martínez, Susana
author García-Ramírez, P.
author_facet García-Ramírez, P.
Pineda-Arellano, C.A.
Millán-Ocampo, D.E.
Álvarez-Gallegos, A.
Sirés Sadornil, Ignacio
Silva-Martínez, Susana
author_role author
author2 Pineda-Arellano, C.A.
Millán-Ocampo, D.E.
Álvarez-Gallegos, A.
Sirés Sadornil, Ignacio
Silva-Martínez, Susana
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Fotocatàlisi
Electroquímica
Potassi
Photocatalysis
Electrochemistry
Potassium
topic Fotocatàlisi
Electroquímica
Potassi
Photocatalysis
Electrochemistry
Potassium
description The chemical oxygen demand (COD) is a widely used parameter to evaluate the quality of water for industrial applications. Currently, the standardized method for COD analysis employs expensive and harmful reagents that require a special treatment for disposal upon use. The photoelectrocatalytic COD detection, based on the photocatalytic activity of a reduced TiO<sub>2</sub> nanotube array photoanode (Ti|NT-TiO<sub>2</sub>) under supply of a low bias potential, represents a fast, cheap and eco-friendly alternative to the standard COD method (COD<sub>STD</sub>). Here, Ti|NT-TiO<sub>2</sub> was synthesized by the anodization method followed by heat treatment and electrochemical reduction. Potassium hydrogen phthalate, glucose and acetic acid were used as model organic compounds. The photoelectrocatalytic detection of COD (COD<sub>PEC</sub>) is based on the photoelectrocatalytic oxidation of target compounds on the surface of the reduced Ti|NT-TiO<sub>2</sub> under UV illumination. Photocurrent transients were recorded using chronocoulometry, and the net charge (Δ<em>q</em>) was plotted as a function of the theoretical COD (COD<sub>TH</sub>). A linear relationship was found between these two parameters regardless of the model compound. That relationship was used to determine the COD<sub>PEC</sub> for acetylsalicylic acid and Terasil Blue dye solutions at concentrations within the range of 0–15 mg L<sup>-1</sup>. A good agreement between COD<sub>PEC</sub> and COD<sub>STD</sub> was achieved. The limit of detection of the method was 3.6 mg L<sup>-1</sup> COD, with the linear range established from 0 to 50 mg L<sup>-1</sup>.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/206822
url https://hdl.handle.net/2445/206822
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1016/j.electacta.2023.143710
Electrochimica Acta, 2023, vol. 476, p. 1-9
https://doi.org/10.1016/j.electacta.2023.143710
dc.rights.none.fl_str_mv cc-by-nc-nd (c) García-Ramírez, P. et al., 2023
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) García-Ramírez, P. et al., 2023
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier Ltd
publisher.none.fl_str_mv Elsevier Ltd
dc.source.none.fl_str_mv Articles publicats en revistes (Ciència dels Materials i Química Física)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,298079

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