Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation

Autores
Senn, Alejandro Marcelo; Quici, Natalia
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Dissolved inorganic nitrogen (DIN) species are key components of the nitrogen cycle and are the main nitrogen pollutants in groundwater. This study investigated the interconversion and removal of the principal DIN compounds ((Formula presented.), (Formula presented.) and (Formula presented.)) via UV light irradiation using a medium-pressure mercury lamp. The experiments were carried out systematically at relatively low nitrogen concentrations (1.5 mM) at varying pHs in the presence and absence of oxygen to compare the reaction rates and suggest the reaction mechanisms. (Formula presented.) was fully converted into (Formula presented.) at a pH > 3 in both oxic and anoxic conditions, and the reaction was faster when the pH was increased following a first-order kinetic at pH 11 (k = 0.12 min−1, R2 = 0.9995). (Formula presented.) was partially converted into (Formula presented.) only at pH 3 and in the presence of oxygen and was stable at an alkaline pH. This interconversion of (Formula presented.) and (Formula presented.) did not yield nitrogen loss in the solution. The addition of formic acid as an electron donor led to the reduction of (Formula presented.) to (Formula presented.). Conversely, (Formula presented.) was converted into (Formula presented.), (Formula presented.) and to an unidentified subproduct in the presence of (Formula presented.) at pH 10. Finally, it was demonstrated that (Formula presented.) and (Formula presented.) react via UV irradiation with stoichiometry 1:1 at pH 10 with the total loss of nitrogen in the solution. With these results, a strategy to remove DIN compounds via UV irradiation was proposed with the eventual use of solar light.
Fil: Senn, Alejandro Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Seguridad Nuclear y Ambiente. Gerencia de Química (CAC); Argentina
Fil: Quici, Natalia. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Tecnológica Nacional; Argentina
Materia
INORGANIC NITROGEN
NITROGEN REMOVAL
PHOTOLYSIS
REACTIVE NITROGEN SPECIES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/220957

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spelling Interconversion and Removal of Inorganic Nitrogen Compounds via UV IrradiationSenn, Alejandro MarceloQuici, NataliaINORGANIC NITROGENNITROGEN REMOVALPHOTOLYSISREACTIVE NITROGEN SPECIEShttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2Dissolved inorganic nitrogen (DIN) species are key components of the nitrogen cycle and are the main nitrogen pollutants in groundwater. This study investigated the interconversion and removal of the principal DIN compounds ((Formula presented.), (Formula presented.) and (Formula presented.)) via UV light irradiation using a medium-pressure mercury lamp. The experiments were carried out systematically at relatively low nitrogen concentrations (1.5 mM) at varying pHs in the presence and absence of oxygen to compare the reaction rates and suggest the reaction mechanisms. (Formula presented.) was fully converted into (Formula presented.) at a pH > 3 in both oxic and anoxic conditions, and the reaction was faster when the pH was increased following a first-order kinetic at pH 11 (k = 0.12 min−1, R2 = 0.9995). (Formula presented.) was partially converted into (Formula presented.) only at pH 3 and in the presence of oxygen and was stable at an alkaline pH. This interconversion of (Formula presented.) and (Formula presented.) did not yield nitrogen loss in the solution. The addition of formic acid as an electron donor led to the reduction of (Formula presented.) to (Formula presented.). Conversely, (Formula presented.) was converted into (Formula presented.), (Formula presented.) and to an unidentified subproduct in the presence of (Formula presented.) at pH 10. Finally, it was demonstrated that (Formula presented.) and (Formula presented.) react via UV irradiation with stoichiometry 1:1 at pH 10 with the total loss of nitrogen in the solution. With these results, a strategy to remove DIN compounds via UV irradiation was proposed with the eventual use of solar light.Fil: Senn, Alejandro Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Seguridad Nuclear y Ambiente. Gerencia de Química (CAC); ArgentinaFil: Quici, Natalia. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Tecnológica Nacional; ArgentinaMDPI2023-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/220957Senn, Alejandro Marcelo; Quici, Natalia; Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation; MDPI; ChemEngineering; 7; 5; 8-2023; 1-112305-7084CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2305-7084/7/5/79info:eu-repo/semantics/altIdentifier/doi/10.3390/chemengineering7050079info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:16:13Zoai:ri.conicet.gov.ar:11336/220957instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:16:13.749CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation
title Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation
spellingShingle Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation
Senn, Alejandro Marcelo
INORGANIC NITROGEN
NITROGEN REMOVAL
PHOTOLYSIS
REACTIVE NITROGEN SPECIES
title_short Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation
title_full Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation
title_fullStr Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation
title_full_unstemmed Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation
title_sort Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation
dc.creator.none.fl_str_mv Senn, Alejandro Marcelo
Quici, Natalia
author Senn, Alejandro Marcelo
author_facet Senn, Alejandro Marcelo
Quici, Natalia
author_role author
author2 Quici, Natalia
author2_role author
dc.subject.none.fl_str_mv INORGANIC NITROGEN
NITROGEN REMOVAL
PHOTOLYSIS
REACTIVE NITROGEN SPECIES
topic INORGANIC NITROGEN
NITROGEN REMOVAL
PHOTOLYSIS
REACTIVE NITROGEN SPECIES
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Dissolved inorganic nitrogen (DIN) species are key components of the nitrogen cycle and are the main nitrogen pollutants in groundwater. This study investigated the interconversion and removal of the principal DIN compounds ((Formula presented.), (Formula presented.) and (Formula presented.)) via UV light irradiation using a medium-pressure mercury lamp. The experiments were carried out systematically at relatively low nitrogen concentrations (1.5 mM) at varying pHs in the presence and absence of oxygen to compare the reaction rates and suggest the reaction mechanisms. (Formula presented.) was fully converted into (Formula presented.) at a pH > 3 in both oxic and anoxic conditions, and the reaction was faster when the pH was increased following a first-order kinetic at pH 11 (k = 0.12 min−1, R2 = 0.9995). (Formula presented.) was partially converted into (Formula presented.) only at pH 3 and in the presence of oxygen and was stable at an alkaline pH. This interconversion of (Formula presented.) and (Formula presented.) did not yield nitrogen loss in the solution. The addition of formic acid as an electron donor led to the reduction of (Formula presented.) to (Formula presented.). Conversely, (Formula presented.) was converted into (Formula presented.), (Formula presented.) and to an unidentified subproduct in the presence of (Formula presented.) at pH 10. Finally, it was demonstrated that (Formula presented.) and (Formula presented.) react via UV irradiation with stoichiometry 1:1 at pH 10 with the total loss of nitrogen in the solution. With these results, a strategy to remove DIN compounds via UV irradiation was proposed with the eventual use of solar light.
Fil: Senn, Alejandro Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Seguridad Nuclear y Ambiente. Gerencia de Química (CAC); Argentina
Fil: Quici, Natalia. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Tecnológica Nacional; Argentina
description Dissolved inorganic nitrogen (DIN) species are key components of the nitrogen cycle and are the main nitrogen pollutants in groundwater. This study investigated the interconversion and removal of the principal DIN compounds ((Formula presented.), (Formula presented.) and (Formula presented.)) via UV light irradiation using a medium-pressure mercury lamp. The experiments were carried out systematically at relatively low nitrogen concentrations (1.5 mM) at varying pHs in the presence and absence of oxygen to compare the reaction rates and suggest the reaction mechanisms. (Formula presented.) was fully converted into (Formula presented.) at a pH > 3 in both oxic and anoxic conditions, and the reaction was faster when the pH was increased following a first-order kinetic at pH 11 (k = 0.12 min−1, R2 = 0.9995). (Formula presented.) was partially converted into (Formula presented.) only at pH 3 and in the presence of oxygen and was stable at an alkaline pH. This interconversion of (Formula presented.) and (Formula presented.) did not yield nitrogen loss in the solution. The addition of formic acid as an electron donor led to the reduction of (Formula presented.) to (Formula presented.). Conversely, (Formula presented.) was converted into (Formula presented.), (Formula presented.) and to an unidentified subproduct in the presence of (Formula presented.) at pH 10. Finally, it was demonstrated that (Formula presented.) and (Formula presented.) react via UV irradiation with stoichiometry 1:1 at pH 10 with the total loss of nitrogen in the solution. With these results, a strategy to remove DIN compounds via UV irradiation was proposed with the eventual use of solar light.
publishDate 2023
dc.date.none.fl_str_mv 2023-08
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/220957
Senn, Alejandro Marcelo; Quici, Natalia; Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation; MDPI; ChemEngineering; 7; 5; 8-2023; 1-11
2305-7084
CONICET Digital
CONICET
url http://hdl.handle.net/11336/220957
identifier_str_mv Senn, Alejandro Marcelo; Quici, Natalia; Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation; MDPI; ChemEngineering; 7; 5; 8-2023; 1-11
2305-7084
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/doi/10.3390/chemengineering7050079
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
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