Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study

Autores
Mohamed, Hanan H.; Mendive, Cecilia Beatriz; Dillert, Ralf; Bahnemann, Detlef W.
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The kinetics and the mechanism of various multielectron transfer reactions initiated by stored electrons in TiO2 nanoparticles have been investigated employing the stopped flow technique. Moreover, the optical properties of the stored electrons in the TiO2 nanoparticles have been studied in detail following the UV (A) photolysis of deaerated aqueous suspensions of TiO2 nanoparticles in the presence of methanol.The reduction of common electron acceptors that are often present in photocatalytic systems such asO2, H2O2, and NO3 - has been investigated. The experimental results clearly show that thestored electrons reduce O2 and H2O2 to water by multielectron transfer processes. Moreover, NO3 - is reduced via the transfer of eight electrons evincing the formation of ammonia. On the other hand, the reduction of toxic metal ions, such as Cu(II), has been studied mixing their respective anoxic aqueous solutions with those containing the electrons stored in the TiO2  particles. A twoelectron transfer is found to occur, indicating the reduction of the copper metal ion into its non toxic metallic form. Other metal ions, such as Zn(II) and Mn(II), could not be reduced by TiO2 electrons, which is readily explained on the bases of their respective redox potentials. The underlying reaction mechanisms are discussed in detail.
Fil: Mohamed, Hanan H.. Leibniz Universitat Hannover; Alemania
Fil: Mendive, Cecilia Beatriz. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina
Fil: Dillert, Ralf. Leibniz Universitat Hannover; Alemania
Fil: Bahnemann, Detlef W.. Leibniz Universitat Hannover; Alemania
Materia
MULTIELECTRON TRANSFER
PHOTOCATALYSIS
SURFACE REDOX
TIO2
STOPPED FLOW
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:11336/268213
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow StudyMohamed, Hanan H.Mendive, Cecilia BeatrizDillert, RalfBahnemann, Detlef W.MULTIELECTRON TRANSFERPHOTOCATALYSISSURFACE REDOXTIO2STOPPED FLOWhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The kinetics and the mechanism of various multielectron transfer reactions initiated by stored electrons in TiO2 nanoparticles have been investigated employing the stopped flow technique. Moreover, the optical properties of the stored electrons in the TiO2 nanoparticles have been studied in detail following the UV (A) photolysis of deaerated aqueous suspensions of TiO2 nanoparticles in the presence of methanol.The reduction of common electron acceptors that are often present in photocatalytic systems such asO2, H2O2, and NO3 - has been investigated. The experimental results clearly show that thestored electrons reduce O2 and H2O2 to water by multielectron transfer processes. Moreover, NO3 - is reduced via the transfer of eight electrons evincing the formation of ammonia. On the other hand, the reduction of toxic metal ions, such as Cu(II), has been studied mixing their respective anoxic aqueous solutions with those containing the electrons stored in the TiO2  particles. A twoelectron transfer is found to occur, indicating the reduction of the copper metal ion into its non toxic metallic form. Other metal ions, such as Zn(II) and Mn(II), could not be reduced by TiO2 electrons, which is readily explained on the bases of their respective redox potentials. The underlying reaction mechanisms are discussed in detail.Fil: Mohamed, Hanan H.. Leibniz Universitat Hannover; AlemaniaFil: Mendive, Cecilia Beatriz. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; ArgentinaFil: Dillert, Ralf. Leibniz Universitat Hannover; AlemaniaFil: Bahnemann, Detlef W.. Leibniz Universitat Hannover; AlemaniaAmerican Chemical Society2011-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/268213Mohamed, Hanan H.; Mendive, Cecilia Beatriz; Dillert, Ralf; Bahnemann, Detlef W.; Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study; American Chemical Society; Journal of Physical Chemistry A; 115; 11; 3-2011; 2139-21471089-5639CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/jp108958winfo:eu-repo/semantics/altIdentifier/doi/10.1021/jp108958winfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:47:36Zoai:ri.conicet.gov.ar:11336/268213instacron: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 09:47:36.575CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study
title Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study
spellingShingle Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study
Mohamed, Hanan H.
MULTIELECTRON TRANSFER
PHOTOCATALYSIS
SURFACE REDOX
TIO2
STOPPED FLOW
title_short Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study
title_full Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study
title_fullStr Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study
title_full_unstemmed Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study
title_sort Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study
dc.creator.none.fl_str_mv Mohamed, Hanan H.
Mendive, Cecilia Beatriz
Dillert, Ralf
Bahnemann, Detlef W.
author Mohamed, Hanan H.
author_facet Mohamed, Hanan H.
Mendive, Cecilia Beatriz
Dillert, Ralf
Bahnemann, Detlef W.
author_role author
author2 Mendive, Cecilia Beatriz
Dillert, Ralf
Bahnemann, Detlef W.
author2_role author
author
author
dc.subject.none.fl_str_mv MULTIELECTRON TRANSFER
PHOTOCATALYSIS
SURFACE REDOX
TIO2
STOPPED FLOW
topic MULTIELECTRON TRANSFER
PHOTOCATALYSIS
SURFACE REDOX
TIO2
STOPPED FLOW
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The kinetics and the mechanism of various multielectron transfer reactions initiated by stored electrons in TiO2 nanoparticles have been investigated employing the stopped flow technique. Moreover, the optical properties of the stored electrons in the TiO2 nanoparticles have been studied in detail following the UV (A) photolysis of deaerated aqueous suspensions of TiO2 nanoparticles in the presence of methanol.The reduction of common electron acceptors that are often present in photocatalytic systems such asO2, H2O2, and NO3 - has been investigated. The experimental results clearly show that thestored electrons reduce O2 and H2O2 to water by multielectron transfer processes. Moreover, NO3 - is reduced via the transfer of eight electrons evincing the formation of ammonia. On the other hand, the reduction of toxic metal ions, such as Cu(II), has been studied mixing their respective anoxic aqueous solutions with those containing the electrons stored in the TiO2  particles. A twoelectron transfer is found to occur, indicating the reduction of the copper metal ion into its non toxic metallic form. Other metal ions, such as Zn(II) and Mn(II), could not be reduced by TiO2 electrons, which is readily explained on the bases of their respective redox potentials. The underlying reaction mechanisms are discussed in detail.
Fil: Mohamed, Hanan H.. Leibniz Universitat Hannover; Alemania
Fil: Mendive, Cecilia Beatriz. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina
Fil: Dillert, Ralf. Leibniz Universitat Hannover; Alemania
Fil: Bahnemann, Detlef W.. Leibniz Universitat Hannover; Alemania
description The kinetics and the mechanism of various multielectron transfer reactions initiated by stored electrons in TiO2 nanoparticles have been investigated employing the stopped flow technique. Moreover, the optical properties of the stored electrons in the TiO2 nanoparticles have been studied in detail following the UV (A) photolysis of deaerated aqueous suspensions of TiO2 nanoparticles in the presence of methanol.The reduction of common electron acceptors that are often present in photocatalytic systems such asO2, H2O2, and NO3 - has been investigated. The experimental results clearly show that thestored electrons reduce O2 and H2O2 to water by multielectron transfer processes. Moreover, NO3 - is reduced via the transfer of eight electrons evincing the formation of ammonia. On the other hand, the reduction of toxic metal ions, such as Cu(II), has been studied mixing their respective anoxic aqueous solutions with those containing the electrons stored in the TiO2  particles. A twoelectron transfer is found to occur, indicating the reduction of the copper metal ion into its non toxic metallic form. Other metal ions, such as Zn(II) and Mn(II), could not be reduced by TiO2 electrons, which is readily explained on the bases of their respective redox potentials. The underlying reaction mechanisms are discussed in detail.
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/11336/268213
Mohamed, Hanan H.; Mendive, Cecilia Beatriz; Dillert, Ralf; Bahnemann, Detlef W.; Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study; American Chemical Society; Journal of Physical Chemistry A; 115; 11; 3-2011; 2139-2147
1089-5639
CONICET Digital
CONICET
url http://hdl.handle.net/11336/268213
identifier_str_mv Mohamed, Hanan H.; Mendive, Cecilia Beatriz; Dillert, Ralf; Bahnemann, Detlef W.; Kinetic and Mechanistic Investigations of Multielectron Transfer Reactions Induced by Stored Electrons in TiO 2 Nanoparticles: A Stopped Flow Study; American Chemical Society; Journal of Physical Chemistry A; 115; 11; 3-2011; 2139-2147
1089-5639
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://pubs.acs.org/doi/10.1021/jp108958w
info:eu-repo/semantics/altIdentifier/doi/10.1021/jp108958w
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_ 1842268870091472896
score 13.13397

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