Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts

A series of nanosized iron-doped titania catalysts has been used for the photocatalytic degradation of ethidium bromide (EtBr) with oxygen. The study shows that EtBr surface adsorption is most favored over basic titania surfaces such as those present in undoped TiO2 and Fe-TiO2 with low iron content...

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Autores: Carbajo Olleros, Jaime, Adán, Cristina, Rey Barroso, Ana, Martínez Arias, Arturo, Bahamonde, A.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2011
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/343176
Acceso en línea:http://hdl.handle.net/10261/343176
Access Level:acceso abierto
Palabra clave:Photocatalysis
Ethidium bromide
Nanostructured iron-doped TiO2H2O2 dosage
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spelling Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalystsCarbajo Olleros, JaimeAdán, CristinaRey Barroso, AnaMartínez Arias, ArturoBahamonde, A.PhotocatalysisEthidium bromideNanostructured iron-doped TiO2H2O2 dosageA series of nanosized iron-doped titania catalysts has been used for the photocatalytic degradation of ethidium bromide (EtBr) with oxygen. The study shows that EtBr surface adsorption is most favored over basic titania surfaces such as those present in undoped TiO2 and Fe-TiO2 with low iron content. This fact is shown to affect strongly the photocatytic mechanism of EtBr degradation. Based on EtBr adsorption and photocatalytic activity analyses, a titania catalyst with an iron content of 0.7wt.% has been selected for subsequent studies using H2O2 as oxidant. Parameters as reaction pH and initial hydrogen peroxide concentration were analyzed to establish optimum operating conditions. It is shown that a new strategy based on dosing H2O2 in a controlled way could minimize radical self-scavenging reactions and improves final EtBr mineralization degree. Finally, the stability and durability of catalyst/activity have been examined through five consecutive cycles of H2O2 dosing. A constant activity level is maintained during at least four consecutive cycles in which total EtBr and 80% of Total Organic Carbon conversion is achieved. © 2010.Spanish MICINN for the financial support of the CTM2007-60577/TECNO project, and J. Carbajo also acknowledges the FPI grant to the MICINN.Elsevier BVMinisterio de Ciencia e Innovación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2024202420112024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/343176reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MEC//CTM2007-60577http://dx.doi.org/10.1016/j.apcatb.2010.11.028Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3431762026-05-22T06:33:51Z
dc.title.none.fl_str_mv Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts
title Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts
spellingShingle Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts
Carbajo Olleros, Jaime
Photocatalysis
Ethidium bromide
Nanostructured iron-doped TiO2H2O2 dosage
title_short Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts
title_full Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts
title_fullStr Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts
title_full_unstemmed Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts
title_sort Optimization of H2O2 use during the photocatalytic degradation of ethidium bromide with TiO2 and iron-doped TiO2 catalysts
dc.creator.none.fl_str_mv Carbajo Olleros, Jaime
Adán, Cristina
Rey Barroso, Ana
Martínez Arias, Arturo
Bahamonde, A.
author Carbajo Olleros, Jaime
author_facet Carbajo Olleros, Jaime
Adán, Cristina
Rey Barroso, Ana
Martínez Arias, Arturo
Bahamonde, A.
author_role author
author2 Adán, Cristina
Rey Barroso, Ana
Martínez Arias, Arturo
Bahamonde, A.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Photocatalysis
Ethidium bromide
Nanostructured iron-doped TiO2H2O2 dosage
topic Photocatalysis
Ethidium bromide
Nanostructured iron-doped TiO2H2O2 dosage
description A series of nanosized iron-doped titania catalysts has been used for the photocatalytic degradation of ethidium bromide (EtBr) with oxygen. The study shows that EtBr surface adsorption is most favored over basic titania surfaces such as those present in undoped TiO2 and Fe-TiO2 with low iron content. This fact is shown to affect strongly the photocatytic mechanism of EtBr degradation. Based on EtBr adsorption and photocatalytic activity analyses, a titania catalyst with an iron content of 0.7wt.% has been selected for subsequent studies using H2O2 as oxidant. Parameters as reaction pH and initial hydrogen peroxide concentration were analyzed to establish optimum operating conditions. It is shown that a new strategy based on dosing H2O2 in a controlled way could minimize radical self-scavenging reactions and improves final EtBr mineralization degree. Finally, the stability and durability of catalyst/activity have been examined through five consecutive cycles of H2O2 dosing. A constant activity level is maintained during at least four consecutive cycles in which total EtBr and 80% of Total Organic Carbon conversion is achieved. © 2010.
publishDate 2011
dc.date.none.fl_str_mv 2011
2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/343176
url http://hdl.handle.net/10261/343176
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MEC//CTM2007-60577
http://dx.doi.org/10.1016/j.apcatb.2010.11.028
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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