Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique

Autores
Meichtry, Jorge Martin; Levy, Ivana Karina; Mohamed, Hanan H.; Dillert, Ralf; Bahnemann, Detlef W.; Litter, Marta Irene
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The dynamics of transfer of electrons stored in TiO2 nanoparticles to As(III), As(V) and uranyl nitrate in water has been investigated using the stopped flow technique. Suspensions of TiO2 nanoparticles with stored trapped electrons (etrap−) were mixed with solutions of acceptor species to evaluate the reactivity, following the temporal evolution of etrap− by the decrease of the absorbance at 600 nm. The results indicate that As(V) and As(III) cannot be reduced by etrap− under the present conditions. In addition, it was observed that the presence of As(V) and As(III) strongly modified the reaction rate between O2 and etrap−, with an increase of the rate when As(V) was present and a decrease in the presence of As(III). In contrast with the As system, U(VI) was observed to react easily with etrap− and U(IV) formation was observed spectroscopically at 650 nm. The possible competence of U(VI) and NO3− for their reduction by etrap− has been analyzed. The inhibition of the U(VI) photocatalytic reduction by O2 could be attributed to the fast oxidation of U(V) and/or U(IV).
Fil: Meichtry, Jorge Martin. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Levy, Ivana Karina. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Mohamed, Hanan H.. Helwan University; Egipto
Fil: Dillert, Ralf. Leibniz Universität Hannover; Alemania
Fil: Bahnemann, Detlef W.. Leibniz Universität Hannover; Alemania. Saint-Petersburg State University; Rusia
Fil: Litter, Marta Irene. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Universidad Nacional de San Martín; Argentina
Materia
Photocatalysis
Titanium Dioxide
Nanoparticles
Arsenic
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:11336/42398
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/42398
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow techniqueMeichtry, Jorge MartinLevy, Ivana KarinaMohamed, Hanan H.Dillert, RalfBahnemann, Detlef W.Litter, Marta IrenePhotocatalysisTitanium DioxideNanoparticlesArsenichttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The dynamics of transfer of electrons stored in TiO2 nanoparticles to As(III), As(V) and uranyl nitrate in water has been investigated using the stopped flow technique. Suspensions of TiO2 nanoparticles with stored trapped electrons (etrap−) were mixed with solutions of acceptor species to evaluate the reactivity, following the temporal evolution of etrap− by the decrease of the absorbance at 600 nm. The results indicate that As(V) and As(III) cannot be reduced by etrap− under the present conditions. In addition, it was observed that the presence of As(V) and As(III) strongly modified the reaction rate between O2 and etrap−, with an increase of the rate when As(V) was present and a decrease in the presence of As(III). In contrast with the As system, U(VI) was observed to react easily with etrap− and U(IV) formation was observed spectroscopically at 650 nm. The possible competence of U(VI) and NO3− for their reduction by etrap− has been analyzed. The inhibition of the U(VI) photocatalytic reduction by O2 could be attributed to the fast oxidation of U(V) and/or U(IV).Fil: Meichtry, Jorge Martin. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Levy, Ivana Karina. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Mohamed, Hanan H.. Helwan University; EgiptoFil: Dillert, Ralf. Leibniz Universität Hannover; AlemaniaFil: Bahnemann, Detlef W.. Leibniz Universität Hannover; Alemania. Saint-Petersburg State University; RusiaFil: Litter, Marta Irene. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Universidad Nacional de San Martín; ArgentinaWiley VCH Verlag2015-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/42398Meichtry, Jorge Martin; Levy, Ivana Karina; Mohamed, Hanan H.; Dillert, Ralf; Bahnemann, Detlef W.; et al.; Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique; Wiley VCH Verlag; Chemphyschem; 17; 12-2015; 885-8921439-4235CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1002/cphc.201500949info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1002/cphc.201500949info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:01:31Zoai:ri.conicet.gov.ar:11336/42398instacron: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 10:01:31.217CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique
title Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique
spellingShingle Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique
Meichtry, Jorge Martin
Photocatalysis
Titanium Dioxide
Nanoparticles
Arsenic
title_short Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique
title_full Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique
title_fullStr Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique
title_full_unstemmed Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique
title_sort Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique
dc.creator.none.fl_str_mv Meichtry, Jorge Martin
Levy, Ivana Karina
Mohamed, Hanan H.
Dillert, Ralf
Bahnemann, Detlef W.
Litter, Marta Irene
author Meichtry, Jorge Martin
author_facet Meichtry, Jorge Martin
Levy, Ivana Karina
Mohamed, Hanan H.
Dillert, Ralf
Bahnemann, Detlef W.
Litter, Marta Irene
author_role author
author2 Levy, Ivana Karina
Mohamed, Hanan H.
Dillert, Ralf
Bahnemann, Detlef W.
Litter, Marta Irene
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Photocatalysis
Titanium Dioxide
Nanoparticles
Arsenic
topic Photocatalysis
Titanium Dioxide
Nanoparticles
Arsenic
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 dynamics of transfer of electrons stored in TiO2 nanoparticles to As(III), As(V) and uranyl nitrate in water has been investigated using the stopped flow technique. Suspensions of TiO2 nanoparticles with stored trapped electrons (etrap−) were mixed with solutions of acceptor species to evaluate the reactivity, following the temporal evolution of etrap− by the decrease of the absorbance at 600 nm. The results indicate that As(V) and As(III) cannot be reduced by etrap− under the present conditions. In addition, it was observed that the presence of As(V) and As(III) strongly modified the reaction rate between O2 and etrap−, with an increase of the rate when As(V) was present and a decrease in the presence of As(III). In contrast with the As system, U(VI) was observed to react easily with etrap− and U(IV) formation was observed spectroscopically at 650 nm. The possible competence of U(VI) and NO3− for their reduction by etrap− has been analyzed. The inhibition of the U(VI) photocatalytic reduction by O2 could be attributed to the fast oxidation of U(V) and/or U(IV).
Fil: Meichtry, Jorge Martin. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Levy, Ivana Karina. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Mohamed, Hanan H.. Helwan University; Egipto
Fil: Dillert, Ralf. Leibniz Universität Hannover; Alemania
Fil: Bahnemann, Detlef W.. Leibniz Universität Hannover; Alemania. Saint-Petersburg State University; Rusia
Fil: Litter, Marta Irene. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia Química. CAC; Argentina. Universidad Nacional de San Martín; Argentina
description The dynamics of transfer of electrons stored in TiO2 nanoparticles to As(III), As(V) and uranyl nitrate in water has been investigated using the stopped flow technique. Suspensions of TiO2 nanoparticles with stored trapped electrons (etrap−) were mixed with solutions of acceptor species to evaluate the reactivity, following the temporal evolution of etrap− by the decrease of the absorbance at 600 nm. The results indicate that As(V) and As(III) cannot be reduced by etrap− under the present conditions. In addition, it was observed that the presence of As(V) and As(III) strongly modified the reaction rate between O2 and etrap−, with an increase of the rate when As(V) was present and a decrease in the presence of As(III). In contrast with the As system, U(VI) was observed to react easily with etrap− and U(IV) formation was observed spectroscopically at 650 nm. The possible competence of U(VI) and NO3− for their reduction by etrap− has been analyzed. The inhibition of the U(VI) photocatalytic reduction by O2 could be attributed to the fast oxidation of U(V) and/or U(IV).
publishDate 2015
dc.date.none.fl_str_mv 2015-12
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/11336/42398
Meichtry, Jorge Martin; Levy, Ivana Karina; Mohamed, Hanan H.; Dillert, Ralf; Bahnemann, Detlef W.; et al.; Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique; Wiley VCH Verlag; Chemphyschem; 17; 12-2015; 885-892
1439-4235
CONICET Digital
CONICET
url http://hdl.handle.net/11336/42398
identifier_str_mv Meichtry, Jorge Martin; Levy, Ivana Karina; Mohamed, Hanan H.; Dillert, Ralf; Bahnemann, Detlef W.; et al.; Mechanistic features of TiO2-heterogeneous photocatalysis of arsenic and uranyl nitrate in aqueous suspensions studied by the stopped flow technique; Wiley VCH Verlag; Chemphyschem; 17; 12-2015; 885-892
1439-4235
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1002/cphc.201500949
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1002/cphc.201500949
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
dc.publisher.none.fl_str_mv Wiley VCH Verlag
publisher.none.fl_str_mv Wiley VCH Verlag
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_ 1842269700354998272
score 13.13397

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