Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants

Autores
Pajares, Adriana Mabel; Bregliani, Mabel Margarita; Natera, Jose Eduardo; Criado, Susana Noemi; Miskoski, Sandra; Escalada, Juan Pablo; Garcia, Norman Andino
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Kinetic and mechanistic aspects on the photooxidation of 3-hydroxypyridine (3-OHP) and phenol (PhOH), taken as model compounds for hydroxyaromatic water-contaminants, was studied. A mixture of the naturally occurring visible-light absorbers humic acid (HA) and vitamin B2 (riboflavin, Rf) was employed as a photosensitizing agent. The work was done in pH 7 aqueous solution, in the presence of 0.04 mM Rf and 50 μg/ml HA and employing photoirradiation wavelengths higher than 360 nm, a range where 3-OHP and PhOH are transparent. The mechanism involved in the photooxidation was mainly evaluated through oxygen consumption measurements. The mixture HA + Rf generates O2(1Δg) and O2-, the latter especially in the presence of electron donors such as the hydorxyaromatic compounds. The rates of oxygen consumption were taken as a measure of the overall oxidation rate of the contaminant model compounds. The photooxidation of 3-OHP at pH 7, sensitized by low Rf and HA concentrations, and standarized by comparison with the photooxidation rate of the known oxidizable target furfuryl alcohol, is an efficient process. PhOH is only degradable in the alkaline range of pH. A moderate decrease in the rate of oxygen consumption by 3-OHP upon Rf + HA sensitization was observed as compared to the simple addition of the oxygen uptake rates for 3-OHP upon individual Rf and HA sensitization. It is attributed to a catalytic decomposition of O2- by HA, which competes with 3-OHP by the oxidative species, inhibiting this oxygen-consumer channel, especially active in the presence of the pyridine derivative. Noticeable photofading of the sensitizers was detected when photolyzed in the absence of the contaminants, within typical irradiation times employed for the hydroxyaromatics degradation.
Fil: Pajares, Adriana Mabel. Universidad Nacional de la Patagonia Austral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Bregliani, Mabel Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral; Argentina
Fil: Natera, Jose Eduardo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Criado, Susana Noemi. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Miskoski, Sandra. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Escalada, Juan Pablo. Universidad Nacional de la Patagonia Austral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Garcia, Norman Andino. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
HUMIC ACID
HYDROXYAROMATICS
PHOTOOXIDATION
PHOTOSENSITIZATION
RIBOFLAVIN
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/188619
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminantsPajares, Adriana MabelBregliani, Mabel MargaritaNatera, Jose EduardoCriado, Susana NoemiMiskoski, SandraEscalada, Juan PabloGarcia, Norman AndinoHUMIC ACIDHYDROXYAROMATICSPHOTOOXIDATIONPHOTOSENSITIZATIONRIBOFLAVINhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Kinetic and mechanistic aspects on the photooxidation of 3-hydroxypyridine (3-OHP) and phenol (PhOH), taken as model compounds for hydroxyaromatic water-contaminants, was studied. A mixture of the naturally occurring visible-light absorbers humic acid (HA) and vitamin B2 (riboflavin, Rf) was employed as a photosensitizing agent. The work was done in pH 7 aqueous solution, in the presence of 0.04 mM Rf and 50 μg/ml HA and employing photoirradiation wavelengths higher than 360 nm, a range where 3-OHP and PhOH are transparent. The mechanism involved in the photooxidation was mainly evaluated through oxygen consumption measurements. The mixture HA + Rf generates O2(1Δg) and O2-, the latter especially in the presence of electron donors such as the hydorxyaromatic compounds. The rates of oxygen consumption were taken as a measure of the overall oxidation rate of the contaminant model compounds. The photooxidation of 3-OHP at pH 7, sensitized by low Rf and HA concentrations, and standarized by comparison with the photooxidation rate of the known oxidizable target furfuryl alcohol, is an efficient process. PhOH is only degradable in the alkaline range of pH. A moderate decrease in the rate of oxygen consumption by 3-OHP upon Rf + HA sensitization was observed as compared to the simple addition of the oxygen uptake rates for 3-OHP upon individual Rf and HA sensitization. It is attributed to a catalytic decomposition of O2- by HA, which competes with 3-OHP by the oxidative species, inhibiting this oxygen-consumer channel, especially active in the presence of the pyridine derivative. Noticeable photofading of the sensitizers was detected when photolyzed in the absence of the contaminants, within typical irradiation times employed for the hydroxyaromatics degradation.Fil: Pajares, Adriana Mabel. Universidad Nacional de la Patagonia Austral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bregliani, Mabel Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral; ArgentinaFil: Natera, Jose Eduardo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Criado, Susana Noemi. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Miskoski, Sandra. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Escalada, Juan Pablo. Universidad Nacional de la Patagonia Austral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Garcia, Norman Andino. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaElsevier Science SA2011-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/188619Pajares, Adriana Mabel; Bregliani, Mabel Margarita; Natera, Jose Eduardo; Criado, Susana Noemi; Miskoski, Sandra; et al.; Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants; Elsevier Science SA; Journal of Photochemistry and Photobiology A: Chemistry; 219; 1; 3-2011; 84-891010-6030CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S1010603011000347info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jphotochem.2011.01.021info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:23:54Zoai:ri.conicet.gov.ar:11336/188619instacron: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:34982025-10-15 14:23:54.545CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants
title Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants
spellingShingle Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants
Pajares, Adriana Mabel
HUMIC ACID
HYDROXYAROMATICS
PHOTOOXIDATION
PHOTOSENSITIZATION
RIBOFLAVIN
title_short Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants
title_full Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants
title_fullStr Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants
title_full_unstemmed Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants
title_sort Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants
dc.creator.none.fl_str_mv Pajares, Adriana Mabel
Bregliani, Mabel Margarita
Natera, Jose Eduardo
Criado, Susana Noemi
Miskoski, Sandra
Escalada, Juan Pablo
Garcia, Norman Andino
author Pajares, Adriana Mabel
author_facet Pajares, Adriana Mabel
Bregliani, Mabel Margarita
Natera, Jose Eduardo
Criado, Susana Noemi
Miskoski, Sandra
Escalada, Juan Pablo
Garcia, Norman Andino
author_role author
author2 Bregliani, Mabel Margarita
Natera, Jose Eduardo
Criado, Susana Noemi
Miskoski, Sandra
Escalada, Juan Pablo
Garcia, Norman Andino
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv HUMIC ACID
HYDROXYAROMATICS
PHOTOOXIDATION
PHOTOSENSITIZATION
RIBOFLAVIN
topic HUMIC ACID
HYDROXYAROMATICS
PHOTOOXIDATION
PHOTOSENSITIZATION
RIBOFLAVIN
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Kinetic and mechanistic aspects on the photooxidation of 3-hydroxypyridine (3-OHP) and phenol (PhOH), taken as model compounds for hydroxyaromatic water-contaminants, was studied. A mixture of the naturally occurring visible-light absorbers humic acid (HA) and vitamin B2 (riboflavin, Rf) was employed as a photosensitizing agent. The work was done in pH 7 aqueous solution, in the presence of 0.04 mM Rf and 50 μg/ml HA and employing photoirradiation wavelengths higher than 360 nm, a range where 3-OHP and PhOH are transparent. The mechanism involved in the photooxidation was mainly evaluated through oxygen consumption measurements. The mixture HA + Rf generates O2(1Δg) and O2-, the latter especially in the presence of electron donors such as the hydorxyaromatic compounds. The rates of oxygen consumption were taken as a measure of the overall oxidation rate of the contaminant model compounds. The photooxidation of 3-OHP at pH 7, sensitized by low Rf and HA concentrations, and standarized by comparison with the photooxidation rate of the known oxidizable target furfuryl alcohol, is an efficient process. PhOH is only degradable in the alkaline range of pH. A moderate decrease in the rate of oxygen consumption by 3-OHP upon Rf + HA sensitization was observed as compared to the simple addition of the oxygen uptake rates for 3-OHP upon individual Rf and HA sensitization. It is attributed to a catalytic decomposition of O2- by HA, which competes with 3-OHP by the oxidative species, inhibiting this oxygen-consumer channel, especially active in the presence of the pyridine derivative. Noticeable photofading of the sensitizers was detected when photolyzed in the absence of the contaminants, within typical irradiation times employed for the hydroxyaromatics degradation.
Fil: Pajares, Adriana Mabel. Universidad Nacional de la Patagonia Austral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Bregliani, Mabel Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia Austral; Argentina
Fil: Natera, Jose Eduardo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Criado, Susana Noemi. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Miskoski, Sandra. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Escalada, Juan Pablo. Universidad Nacional de la Patagonia Austral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Garcia, Norman Andino. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Kinetic and mechanistic aspects on the photooxidation of 3-hydroxypyridine (3-OHP) and phenol (PhOH), taken as model compounds for hydroxyaromatic water-contaminants, was studied. A mixture of the naturally occurring visible-light absorbers humic acid (HA) and vitamin B2 (riboflavin, Rf) was employed as a photosensitizing agent. The work was done in pH 7 aqueous solution, in the presence of 0.04 mM Rf and 50 μg/ml HA and employing photoirradiation wavelengths higher than 360 nm, a range where 3-OHP and PhOH are transparent. The mechanism involved in the photooxidation was mainly evaluated through oxygen consumption measurements. The mixture HA + Rf generates O2(1Δg) and O2-, the latter especially in the presence of electron donors such as the hydorxyaromatic compounds. The rates of oxygen consumption were taken as a measure of the overall oxidation rate of the contaminant model compounds. The photooxidation of 3-OHP at pH 7, sensitized by low Rf and HA concentrations, and standarized by comparison with the photooxidation rate of the known oxidizable target furfuryl alcohol, is an efficient process. PhOH is only degradable in the alkaline range of pH. A moderate decrease in the rate of oxygen consumption by 3-OHP upon Rf + HA sensitization was observed as compared to the simple addition of the oxygen uptake rates for 3-OHP upon individual Rf and HA sensitization. It is attributed to a catalytic decomposition of O2- by HA, which competes with 3-OHP by the oxidative species, inhibiting this oxygen-consumer channel, especially active in the presence of the pyridine derivative. Noticeable photofading of the sensitizers was detected when photolyzed in the absence of the contaminants, within typical irradiation times employed for the hydroxyaromatics degradation.
publishDate 2011
dc.date.none.fl_str_mv 2011-03
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/11336/188619
Pajares, Adriana Mabel; Bregliani, Mabel Margarita; Natera, Jose Eduardo; Criado, Susana Noemi; Miskoski, Sandra; et al.; Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants; Elsevier Science SA; Journal of Photochemistry and Photobiology A: Chemistry; 219; 1; 3-2011; 84-89
1010-6030
CONICET Digital
CONICET
url http://hdl.handle.net/11336/188619
identifier_str_mv Pajares, Adriana Mabel; Bregliani, Mabel Margarita; Natera, Jose Eduardo; Criado, Susana Noemi; Miskoski, Sandra; et al.; Mechanism of the photosensitizing action of a mixture humic acid-riboflavin in the degradation of water-contaminants; Elsevier Science SA; Journal of Photochemistry and Photobiology A: Chemistry; 219; 1; 3-2011; 84-89
1010-6030
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S1010603011000347
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jphotochem.2011.01.021
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
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application/pdf
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dc.publisher.none.fl_str_mv Elsevier Science SA
publisher.none.fl_str_mv Elsevier Science SA
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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