TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine

Autores
Levy, Ivana Karina; Mizrahi, Martin Daniel; Ruano, Gustavo; Zampieri, Guillermo Enrique; Requejo, Felix Gregorio; Litter, Marta Irene
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Heterogeneous photocatalytic reduction of As(V) and As(III) at different concentrations over TiO2 under UV light in deoxygenated aqueous suspensions is described. For the first time, As(0) was unambiguously identified together with arsine(AsH3) as reaction products. As(V) reduction requires the presence of an electron donor(methanol in the present case) and takes place through the hydroxymethyl radical formed from methanol oxidation by holes or hydroxyl radicals. On the contrary, As(III)reduction takes place through direct reduction by the TiO2-conduction band electrons. Detailed mechanisms for the photocatalytic processes are proposed. Although reduction to solid As(0) is convenient for purposes of As removal from water as a deposit on TiO2, attention must be paid to formation of AsH3, one of the most toxic forms of As, and strategies for AsH3 treatment should be considered.
Fil: Levy, Ivana Karina. Comisión Nacional de Energía Atómica; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Mizrahi, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Ruano, Gustavo. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Zampieri, Guillermo Enrique. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
Fil: Requejo, Felix Gregorio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Litter, Marta Irene. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
photocatalytic
TiO2
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:11336/236777
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/236777
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsineLevy, Ivana KarinaMizrahi, Martin DanielRuano, GustavoZampieri, Guillermo EnriqueRequejo, Felix GregorioLitter, Marta IrenephotocatalyticTiO2arsenichttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Heterogeneous photocatalytic reduction of As(V) and As(III) at different concentrations over TiO2 under UV light in deoxygenated aqueous suspensions is described. For the first time, As(0) was unambiguously identified together with arsine(AsH3) as reaction products. As(V) reduction requires the presence of an electron donor(methanol in the present case) and takes place through the hydroxymethyl radical formed from methanol oxidation by holes or hydroxyl radicals. On the contrary, As(III)reduction takes place through direct reduction by the TiO2-conduction band electrons. Detailed mechanisms for the photocatalytic processes are proposed. Although reduction to solid As(0) is convenient for purposes of As removal from water as a deposit on TiO2, attention must be paid to formation of AsH3, one of the most toxic forms of As, and strategies for AsH3 treatment should be considered.Fil: Levy, Ivana Karina. Comisión Nacional de Energía Atómica; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Mizrahi, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Ruano, Gustavo. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Zampieri, Guillermo Enrique. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaFil: Requejo, Felix Gregorio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Litter, Marta Irene. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaAmerican Chemical Society2012-01info: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/pdfhttp://hdl.handle.net/11336/236777Levy, Ivana Karina; Mizrahi, Martin Daniel; Ruano, Gustavo; Zampieri, Guillermo Enrique; Requejo, Felix Gregorio; et al.; TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine; American Chemical Society; Environmental Science & Technology; 46; 4; 1-2012; 2299-23080013-936XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1021/es202638cinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:08:25Zoai:ri.conicet.gov.ar:11336/236777instacron: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 10:08:25.317CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
spellingShingle TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
Levy, Ivana Karina
photocatalytic
TiO2
arsenic
title_short TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_full TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_fullStr TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_full_unstemmed TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_sort TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
dc.creator.none.fl_str_mv Levy, Ivana Karina
Mizrahi, Martin Daniel
Ruano, Gustavo
Zampieri, Guillermo Enrique
Requejo, Felix Gregorio
Litter, Marta Irene
author Levy, Ivana Karina
author_facet Levy, Ivana Karina
Mizrahi, Martin Daniel
Ruano, Gustavo
Zampieri, Guillermo Enrique
Requejo, Felix Gregorio
Litter, Marta Irene
author_role author
author2 Mizrahi, Martin Daniel
Ruano, Gustavo
Zampieri, Guillermo Enrique
Requejo, Felix Gregorio
Litter, Marta Irene
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv photocatalytic
TiO2
arsenic
topic photocatalytic
TiO2
arsenic
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Heterogeneous photocatalytic reduction of As(V) and As(III) at different concentrations over TiO2 under UV light in deoxygenated aqueous suspensions is described. For the first time, As(0) was unambiguously identified together with arsine(AsH3) as reaction products. As(V) reduction requires the presence of an electron donor(methanol in the present case) and takes place through the hydroxymethyl radical formed from methanol oxidation by holes or hydroxyl radicals. On the contrary, As(III)reduction takes place through direct reduction by the TiO2-conduction band electrons. Detailed mechanisms for the photocatalytic processes are proposed. Although reduction to solid As(0) is convenient for purposes of As removal from water as a deposit on TiO2, attention must be paid to formation of AsH3, one of the most toxic forms of As, and strategies for AsH3 treatment should be considered.
Fil: Levy, Ivana Karina. Comisión Nacional de Energía Atómica; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Mizrahi, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Ruano, Gustavo. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Zampieri, Guillermo Enrique. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
Fil: Requejo, Felix Gregorio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Litter, Marta Irene. Comisión Nacional de Energía Atómica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Heterogeneous photocatalytic reduction of As(V) and As(III) at different concentrations over TiO2 under UV light in deoxygenated aqueous suspensions is described. For the first time, As(0) was unambiguously identified together with arsine(AsH3) as reaction products. As(V) reduction requires the presence of an electron donor(methanol in the present case) and takes place through the hydroxymethyl radical formed from methanol oxidation by holes or hydroxyl radicals. On the contrary, As(III)reduction takes place through direct reduction by the TiO2-conduction band electrons. Detailed mechanisms for the photocatalytic processes are proposed. Although reduction to solid As(0) is convenient for purposes of As removal from water as a deposit on TiO2, attention must be paid to formation of AsH3, one of the most toxic forms of As, and strategies for AsH3 treatment should be considered.
publishDate 2012
dc.date.none.fl_str_mv 2012-01
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/11336/236777
Levy, Ivana Karina; Mizrahi, Martin Daniel; Ruano, Gustavo; Zampieri, Guillermo Enrique; Requejo, Felix Gregorio; et al.; TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine; American Chemical Society; Environmental Science & Technology; 46; 4; 1-2012; 2299-2308
0013-936X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/236777
identifier_str_mv Levy, Ivana Karina; Mizrahi, Martin Daniel; Ruano, Gustavo; Zampieri, Guillermo Enrique; Requejo, Felix Gregorio; et al.; TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine; American Chemical Society; Environmental Science & Technology; 46; 4; 1-2012; 2299-2308
0013-936X
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/es202638c
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
application/pdf
application/pdf
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_ 1842270043742666752
score 13.13397

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