Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices

Groundwater is one of the main freshwater resources on the Earth, but its contamination by NO3− and pesticides jeopardizes its suitability for consumption. In this work, the simultaneous electro-oxidation of insecticide imidacloprid (IMC) and electroreduction of NO3− in softened groundwater containi...

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Autores: Oriol, Roger, Bernicola, M.P., Brillas, Enric, Cabot Julià, Pere-Lluís, Sirés Sadornil, Ignacio
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2019
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:2445/147662
Acceso en línea:https://hdl.handle.net/2445/147662
Access Level:acceso abierto
Palabra clave:Oxidació electroquímica
Nitrats
Hidrologia d'aigües subterrànies
Electrolytic oxidation
Nitrates
Groundwater hydrology
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spelling Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matricesOriol, RogerBernicola, M.P.Brillas, EnricCabot Julià, Pere-LluísSirés Sadornil, IgnacioOxidació electroquímicaNitratsHidrologia d'aigües subterràniesElectrolytic oxidationNitratesGroundwater hydrologyGroundwater is one of the main freshwater resources on the Earth, but its contamination by NO3− and pesticides jeopardizes its suitability for consumption. In this work, the simultaneous electro-oxidation of insecticide imidacloprid (IMC) and electroreduction of NO3− in softened groundwater containing a large amount of Cl− has been addressed. The assays were carried out in a stirred undivided tank reactor containing either a boron-doped diamond (BDD) or IrO2 anode, and Fe cathode, which showed greater electrocatalytic activity than stainless steel to reduce NO3−. Comparative assays in simulated water mimicking the anionic composition of groundwater were made to assess the influence of natural organic matter (NOM) on the decontamination process. The BDD/Fe cell had much greater performance than the IrO2/Fe one, although the former produced larger amounts of ClO3− and ClO4−. In all cases, the NO3−, Cl− and IMC decays agreed with a (pseudo)-first-order kinetics. In the BDD/Fe cell, total NO3− removal was reached at j ≥ 10 mA cm−2 in softened groundwater, at similar rate in the presence and absence of IMC, but it was decelerated using the simulated matrix. The N-products formed upon NO3− electroreduction contributed to IMC degradation, but its decay was inhibited by NOM because of the partial consumption of oxidants like hydroxyl radical and active chlorine. Operating at 5 mA cm−2 for 240 min, total removal of the insecticide and 61.5% total organic carbon (TOC) decay were achieved, also attaining a low NO3− content that was suitable for humans. Eight heteroaromatic products were identified, allowing the proposal of a reaction sequence for IMC degradation in groundwater.Elsevier Ltd2020202120192020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion13 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/147662Articles 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.electacta.2019.05.002Electrochimica Acta, 2019, vol. 317, p. 753-765https://doi.org/10.1016/j.electacta.2019.05.002cc-by-nc-nd (c) Elsevier Ltd, 2019http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1476622026-05-29T05:05:01Z
dc.title.none.fl_str_mv Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices
title Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices
spellingShingle Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices
Oriol, Roger
Oxidació electroquímica
Nitrats
Hidrologia d'aigües subterrànies
Electrolytic oxidation
Nitrates
Groundwater hydrology
title_short Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices
title_full Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices
title_fullStr Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices
title_full_unstemmed Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices
title_sort Paired electro-oxidation of insecticide imidacloprid and electrodenitrification in simulated and real water matrices
dc.creator.none.fl_str_mv Oriol, Roger
Bernicola, M.P.
Brillas, Enric
Cabot Julià, Pere-Lluís
Sirés Sadornil, Ignacio
author Oriol, Roger
author_facet Oriol, Roger
Bernicola, M.P.
Brillas, Enric
Cabot Julià, Pere-Lluís
Sirés Sadornil, Ignacio
author_role author
author2 Bernicola, M.P.
Brillas, Enric
Cabot Julià, Pere-Lluís
Sirés Sadornil, Ignacio
author2_role author
author
author
author
dc.subject.none.fl_str_mv Oxidació electroquímica
Nitrats
Hidrologia d'aigües subterrànies
Electrolytic oxidation
Nitrates
Groundwater hydrology
topic Oxidació electroquímica
Nitrats
Hidrologia d'aigües subterrànies
Electrolytic oxidation
Nitrates
Groundwater hydrology
description Groundwater is one of the main freshwater resources on the Earth, but its contamination by NO3− and pesticides jeopardizes its suitability for consumption. In this work, the simultaneous electro-oxidation of insecticide imidacloprid (IMC) and electroreduction of NO3− in softened groundwater containing a large amount of Cl− has been addressed. The assays were carried out in a stirred undivided tank reactor containing either a boron-doped diamond (BDD) or IrO2 anode, and Fe cathode, which showed greater electrocatalytic activity than stainless steel to reduce NO3−. Comparative assays in simulated water mimicking the anionic composition of groundwater were made to assess the influence of natural organic matter (NOM) on the decontamination process. The BDD/Fe cell had much greater performance than the IrO2/Fe one, although the former produced larger amounts of ClO3− and ClO4−. In all cases, the NO3−, Cl− and IMC decays agreed with a (pseudo)-first-order kinetics. In the BDD/Fe cell, total NO3− removal was reached at j ≥ 10 mA cm−2 in softened groundwater, at similar rate in the presence and absence of IMC, but it was decelerated using the simulated matrix. The N-products formed upon NO3− electroreduction contributed to IMC degradation, but its decay was inhibited by NOM because of the partial consumption of oxidants like hydroxyl radical and active chlorine. Operating at 5 mA cm−2 for 240 min, total removal of the insecticide and 61.5% total organic carbon (TOC) decay were achieved, also attaining a low NO3− content that was suitable for humans. Eight heteroaromatic products were identified, allowing the proposal of a reaction sequence for IMC degradation in groundwater.
publishDate 2019
dc.date.none.fl_str_mv 2019
2020
2020
2021
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/2445/147662
url https://hdl.handle.net/2445/147662
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.electacta.2019.05.002
Electrochimica Acta, 2019, vol. 317, p. 753-765
https://doi.org/10.1016/j.electacta.2019.05.002
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier Ltd, 2019
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 Ltd, 2019
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 13 p.
application/pdf
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: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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