Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products

Here, we demonstrate the viability of a ZnO/TiO2/Ag2Se thin-film composite synthesized on FTO to degrade the drug naproxen in aqueous solutions by visible-light photoelectrocatalysis (PEC). The experiments were made with 100 mL of solutions containing 5 mg L−1 drug and 50 mM Na2SO4 at natural pH, us...

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Autores: Changanaqui, Katherina, Alarcón, Hugo, Brillas, Enric, Sirés Sadornil, Ignacio
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/161899
Acceso en línea:https://hdl.handle.net/2445/161899
Access Level:acceso abierto
Palabra clave:Oxidació electroquímica
Depuració de l'aigua
Contaminació de l'aigua
Medicaments
Electrolytic oxidation
Water purification
Water pollution
Drugs
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spelling Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-productsChanganaqui, KatherinaAlarcón, HugoBrillas, EnricSirés Sadornil, IgnacioOxidació electroquímicaDepuració de l'aiguaContaminació de l'aiguaMedicamentsElectrolytic oxidationWater purificationWater pollutionDrugsHere, we demonstrate the viability of a ZnO/TiO2/Ag2Se thin-film composite synthesized on FTO to degrade the drug naproxen in aqueous solutions by visible-light photoelectrocatalysis (PEC). The experiments were made with 100 mL of solutions containing 5 mg L−1 drug and 50 mM Na2SO4 at natural pH, using a cell equipped with a Pt wire as cathode and the composite as photoanode exposed to a 36Wblue LED lamp. Total degradation was achieved after 210 min of electrolysis at anodic potential of +1.0 V/Ag|AgCl. This resulted from the oxidative action of hydroxyl radicals formed via direct anodic water discharge and through mediated water oxidation by photogenerated holes. The degradation rate decreased at higher naproxen concentration, but the treatment efficiency became higher due the deceleration of the parasitic reactions involving hydroxyl radicals. In chloride medium, the photoanode showed a large ability to produce active chlorine, which contributed to the oxidation of the target molecule. LC-QToF-MS analysis of treated solutions revealed the generation of four primary naphthalenic by-products, from which the initial degradation route of naproxen is proposed.Elsevier B.V.2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/161899Articles publicats en revistes (Ciència dels Materials i Química Física)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1016/j.jelechem.2020.114192Journal of Electroanalytical Chemistry, 2020, vol. 867, num. 114192https://doi.org/10.1016/j.jelechem.2020.114192cc-by-nc-nd (c) Elsevier B.V., 2020http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1618992026-05-27T06:46:51Z
dc.title.none.fl_str_mv Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products
title Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products
spellingShingle Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products
Changanaqui, Katherina
Oxidació electroquímica
Depuració de l'aigua
Contaminació de l'aigua
Medicaments
Electrolytic oxidation
Water purification
Water pollution
Drugs
title_short Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products
title_full Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products
title_fullStr Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products
title_full_unstemmed Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products
title_sort Blue LED light-driven photoelectrocatalytic removal of naproxen fromwater: Kinetics and primary by-products
dc.creator.none.fl_str_mv Changanaqui, Katherina
Alarcón, Hugo
Brillas, Enric
Sirés Sadornil, Ignacio
author Changanaqui, Katherina
author_facet Changanaqui, Katherina
Alarcón, Hugo
Brillas, Enric
Sirés Sadornil, Ignacio
author_role author
author2 Alarcón, Hugo
Brillas, Enric
Sirés Sadornil, Ignacio
author2_role author
author
author
dc.subject.none.fl_str_mv Oxidació electroquímica
Depuració de l'aigua
Contaminació de l'aigua
Medicaments
Electrolytic oxidation
Water purification
Water pollution
Drugs
topic Oxidació electroquímica
Depuració de l'aigua
Contaminació de l'aigua
Medicaments
Electrolytic oxidation
Water purification
Water pollution
Drugs
description Here, we demonstrate the viability of a ZnO/TiO2/Ag2Se thin-film composite synthesized on FTO to degrade the drug naproxen in aqueous solutions by visible-light photoelectrocatalysis (PEC). The experiments were made with 100 mL of solutions containing 5 mg L−1 drug and 50 mM Na2SO4 at natural pH, using a cell equipped with a Pt wire as cathode and the composite as photoanode exposed to a 36Wblue LED lamp. Total degradation was achieved after 210 min of electrolysis at anodic potential of +1.0 V/Ag|AgCl. This resulted from the oxidative action of hydroxyl radicals formed via direct anodic water discharge and through mediated water oxidation by photogenerated holes. The degradation rate decreased at higher naproxen concentration, but the treatment efficiency became higher due the deceleration of the parasitic reactions involving hydroxyl radicals. In chloride medium, the photoanode showed a large ability to produce active chlorine, which contributed to the oxidation of the target molecule. LC-QToF-MS analysis of treated solutions revealed the generation of four primary naphthalenic by-products, from which the initial degradation route of naproxen is proposed.
publishDate 2020
dc.date.none.fl_str_mv 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/2445/161899
url https://hdl.handle.net/2445/161899
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.jelechem.2020.114192
Journal of Electroanalytical Chemistry, 2020, vol. 867, num. 114192
https://doi.org/10.1016/j.jelechem.2020.114192
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier B.V., 2020
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., 2020
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 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: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 15.301603

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