Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2

Autores
Testa, Juan J.; Grela, Maria Alejandra; Litter, Marta Irene
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Direct evidence of the involvement of Cr(V) intermediacy in Cr(VI) heterogeneous photocatalytic reduction over TiO2 was obtained by EPR spectroscopy, in the presence and absence of ethylenediaminetetraacetic acid (EDTA). The rate of formation of Cr(V) becomes rapidly inhibited in the absence of a hole scavenger. Addition ofEDTAis found to efficiently suppress the electron-shuttle mechanism by which Cr(VI) reduction is inhibited. Analysis of the data indicates that Cr(V) is formed by a one-electron-transfer process and does not involve Cr(IV) disproportion. It is suggested that Cr(III) formation occurs similarly from Cr(IV) through a charge-transfer mechanism.
Fil: Testa, Juan J.. Universidad de Morón; Argentina
Fil: Grela, Maria Alejandra. Universidad Nacional de Mar del Plata; Argentina
Fil: Litter, Marta Irene. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; Argentina
Materia
Edta
Cr(Vi)
Cr(V)
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:11336/42422
Acceder
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network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2Testa, Juan J.Grela, Maria AlejandraLitter, Marta IreneEdtaCr(Vi)Cr(V)https://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Direct evidence of the involvement of Cr(V) intermediacy in Cr(VI) heterogeneous photocatalytic reduction over TiO2 was obtained by EPR spectroscopy, in the presence and absence of ethylenediaminetetraacetic acid (EDTA). The rate of formation of Cr(V) becomes rapidly inhibited in the absence of a hole scavenger. Addition ofEDTAis found to efficiently suppress the electron-shuttle mechanism by which Cr(VI) reduction is inhibited. Analysis of the data indicates that Cr(V) is formed by a one-electron-transfer process and does not involve Cr(IV) disproportion. It is suggested that Cr(III) formation occurs similarly from Cr(IV) through a charge-transfer mechanism.Fil: Testa, Juan J.. Universidad de Morón; ArgentinaFil: Grela, Maria Alejandra. Universidad Nacional de Mar del Plata; ArgentinaFil: Litter, Marta Irene. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; ArgentinaAmerican Chemical Society2001-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/42422Testa, Juan J.; Grela, Maria Alejandra; Litter, Marta Irene; Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2; American Chemical Society; Langmuir; 17; 12; 6-2001; 3515-35170743-7463CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1021/la010100yinfo:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/abs/10.1021/la010100yinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:07:49Zoai:ri.conicet.gov.ar:11336/42422instacron: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:34982025-09-03 10:07:49.956CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2
title Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2
spellingShingle Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2
Testa, Juan J.
Edta
Cr(Vi)
Cr(V)
title_short Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2
title_full Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2
title_fullStr Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2
title_full_unstemmed Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2
title_sort Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2
dc.creator.none.fl_str_mv Testa, Juan J.
Grela, Maria Alejandra
Litter, Marta Irene
author Testa, Juan J.
author_facet Testa, Juan J.
Grela, Maria Alejandra
Litter, Marta Irene
author_role author
author2 Grela, Maria Alejandra
Litter, Marta Irene
author2_role author
author
dc.subject.none.fl_str_mv Edta
Cr(Vi)
Cr(V)
topic Edta
Cr(Vi)
Cr(V)
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Direct evidence of the involvement of Cr(V) intermediacy in Cr(VI) heterogeneous photocatalytic reduction over TiO2 was obtained by EPR spectroscopy, in the presence and absence of ethylenediaminetetraacetic acid (EDTA). The rate of formation of Cr(V) becomes rapidly inhibited in the absence of a hole scavenger. Addition ofEDTAis found to efficiently suppress the electron-shuttle mechanism by which Cr(VI) reduction is inhibited. Analysis of the data indicates that Cr(V) is formed by a one-electron-transfer process and does not involve Cr(IV) disproportion. It is suggested that Cr(III) formation occurs similarly from Cr(IV) through a charge-transfer mechanism.
Fil: Testa, Juan J.. Universidad de Morón; Argentina
Fil: Grela, Maria Alejandra. Universidad Nacional de Mar del Plata; Argentina
Fil: Litter, Marta Irene. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; Argentina
description Direct evidence of the involvement of Cr(V) intermediacy in Cr(VI) heterogeneous photocatalytic reduction over TiO2 was obtained by EPR spectroscopy, in the presence and absence of ethylenediaminetetraacetic acid (EDTA). The rate of formation of Cr(V) becomes rapidly inhibited in the absence of a hole scavenger. Addition ofEDTAis found to efficiently suppress the electron-shuttle mechanism by which Cr(VI) reduction is inhibited. Analysis of the data indicates that Cr(V) is formed by a one-electron-transfer process and does not involve Cr(IV) disproportion. It is suggested that Cr(III) formation occurs similarly from Cr(IV) through a charge-transfer mechanism.
publishDate 2001
dc.date.none.fl_str_mv 2001-06
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/11336/42422
Testa, Juan J.; Grela, Maria Alejandra; Litter, Marta Irene; Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2; American Chemical Society; Langmuir; 17; 12; 6-2001; 3515-3517
0743-7463
CONICET Digital
CONICET
url http://hdl.handle.net/11336/42422
identifier_str_mv Testa, Juan J.; Grela, Maria Alejandra; Litter, Marta Irene; Experimental Evidence in Favor of an Initial One-Electron-Transfer Process in the Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO 2; American Chemical Society; Langmuir; 17; 12; 6-2001; 3515-3517
0743-7463
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1021/la010100y
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/abs/10.1021/la010100y
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
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
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
_version_ 1842270019564601344
score 13.13397

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