Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine

Autores
Rodriguez, Hernan Bernardo; Di Iorio, Yesica Dolores; Meichtry, Jorge Martin; Grela, Maria Alejandra; Litter, Marta Irene; San Roman, Enrique Arnoldo
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
As previous studies have shown, the photocatalytic reduction of Cr(VI) to Cr(III) in the presence of 4-chlorophenol can be carried out efficiently under visible irradiation using TiO2 modified with hydroxoaluminum-tricarboxymonoamide phthalocyanine (AlTCPc) in spite of the high aggregation tendency of the dye. In the present work, photocurrent and absorption spectra of AlTCPc modified TiO2 films are studied together with absorption and fluorescence of the dye in solution as a function of the concentration of the dye to clarify (a) the role of aggregates and the nature of the species responsible for electron injection into the semiconductor and (b) the reasons why, as reported earlier, the photocatalytic activity is nearly independent of dye loading at constant TiO2 mass. Results are consistent with the presence of AlTCPc clusters with similar properties both on the TiO2 surface and in H2O?DMSO solution. The actual photoactive species is the monomeric dye electronically coupled to the semiconductor. Monomer concentration depends only slightly on AlTCPc analytical concentration, in a way similar to surfactant monomers in micellar equilibrium, thus explaining the independence of photocatalytic activity on dye concentration.
Fil: Rodriguez, Hernan Bernardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Di Iorio, Yesica Dolores. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación en Ciencia y Tecnología de Materiales (i); Argentina. Universidad Nacional de Mar del Plata; Argentina
Fil: Meichtry, Jorge Martin. Comision Nacional de Energia Atomica. Gerencia Quimica. CAC; Argentina
Fil: Grela, Maria Alejandra. Universidad Nacional de Mar del Plata; Argentina
Fil: Litter, Marta Irene. Comisión Nacional de Energía Atómica. Gerencia del _rea de Seguridad Nuclear y Ambiente. Gerencia de Química (cac); Argentina
Fil: San Roman, Enrique Arnoldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina
Materia
Sensitization
Semiconductor
Dye
Cluster Formation
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:11336/8268
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/8268
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanineRodriguez, Hernan BernardoDi Iorio, Yesica DoloresMeichtry, Jorge MartinGrela, Maria AlejandraLitter, Marta IreneSan Roman, Enrique ArnoldoSensitizationSemiconductorDyeCluster Formationhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1As previous studies have shown, the photocatalytic reduction of Cr(VI) to Cr(III) in the presence of 4-chlorophenol can be carried out efficiently under visible irradiation using TiO2 modified with hydroxoaluminum-tricarboxymonoamide phthalocyanine (AlTCPc) in spite of the high aggregation tendency of the dye. In the present work, photocurrent and absorption spectra of AlTCPc modified TiO2 films are studied together with absorption and fluorescence of the dye in solution as a function of the concentration of the dye to clarify (a) the role of aggregates and the nature of the species responsible for electron injection into the semiconductor and (b) the reasons why, as reported earlier, the photocatalytic activity is nearly independent of dye loading at constant TiO2 mass. Results are consistent with the presence of AlTCPc clusters with similar properties both on the TiO2 surface and in H2O?DMSO solution. The actual photoactive species is the monomeric dye electronically coupled to the semiconductor. Monomer concentration depends only slightly on AlTCPc analytical concentration, in a way similar to surfactant monomers in micellar equilibrium, thus explaining the independence of photocatalytic activity on dye concentration.Fil: Rodriguez, Hernan Bernardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Di Iorio, Yesica Dolores. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación en Ciencia y Tecnología de Materiales (i); Argentina. Universidad Nacional de Mar del Plata; ArgentinaFil: Meichtry, Jorge Martin. Comision Nacional de Energia Atomica. Gerencia Quimica. CAC; ArgentinaFil: Grela, Maria Alejandra. Universidad Nacional de Mar del Plata; ArgentinaFil: Litter, Marta Irene. Comisión Nacional de Energía Atómica. Gerencia del _rea de Seguridad Nuclear y Ambiente. Gerencia de Química (cac); ArgentinaFil: San Roman, Enrique Arnoldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; ArgentinaRoyal Society Of Chemistry2013-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/8268Rodriguez, Hernan Bernardo; Di Iorio, Yesica Dolores; Meichtry, Jorge Martin; Grela, Maria Alejandra; Litter, Marta Irene; et al.; Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine; Royal Society Of Chemistry; Photochemical And Photobiological Sciences; 12; 11; 10-2013; 1984-19901474-905Xenginfo:eu-repo/semantics/altIdentifier/url/http://pubs.rsc.org/en/Content/ArticleLanding/2013/PP/c3pp50191d#!divAbstractinfo:eu-repo/semantics/altIdentifier/doi/10.1039/C3PP50191Dinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:00:30Zoai:ri.conicet.gov.ar:11336/8268instacron: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 10:00:30.639CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
title Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
spellingShingle Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
Rodriguez, Hernan Bernardo
Sensitization
Semiconductor
Dye
Cluster Formation
title_short Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
title_full Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
title_fullStr Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
title_full_unstemmed Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
title_sort Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
dc.creator.none.fl_str_mv Rodriguez, Hernan Bernardo
Di Iorio, Yesica Dolores
Meichtry, Jorge Martin
Grela, Maria Alejandra
Litter, Marta Irene
San Roman, Enrique Arnoldo
author Rodriguez, Hernan Bernardo
author_facet Rodriguez, Hernan Bernardo
Di Iorio, Yesica Dolores
Meichtry, Jorge Martin
Grela, Maria Alejandra
Litter, Marta Irene
San Roman, Enrique Arnoldo
author_role author
author2 Di Iorio, Yesica Dolores
Meichtry, Jorge Martin
Grela, Maria Alejandra
Litter, Marta Irene
San Roman, Enrique Arnoldo
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Sensitization
Semiconductor
Dye
Cluster Formation
topic Sensitization
Semiconductor
Dye
Cluster Formation
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv As previous studies have shown, the photocatalytic reduction of Cr(VI) to Cr(III) in the presence of 4-chlorophenol can be carried out efficiently under visible irradiation using TiO2 modified with hydroxoaluminum-tricarboxymonoamide phthalocyanine (AlTCPc) in spite of the high aggregation tendency of the dye. In the present work, photocurrent and absorption spectra of AlTCPc modified TiO2 films are studied together with absorption and fluorescence of the dye in solution as a function of the concentration of the dye to clarify (a) the role of aggregates and the nature of the species responsible for electron injection into the semiconductor and (b) the reasons why, as reported earlier, the photocatalytic activity is nearly independent of dye loading at constant TiO2 mass. Results are consistent with the presence of AlTCPc clusters with similar properties both on the TiO2 surface and in H2O?DMSO solution. The actual photoactive species is the monomeric dye electronically coupled to the semiconductor. Monomer concentration depends only slightly on AlTCPc analytical concentration, in a way similar to surfactant monomers in micellar equilibrium, thus explaining the independence of photocatalytic activity on dye concentration.
Fil: Rodriguez, Hernan Bernardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Di Iorio, Yesica Dolores. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigación en Ciencia y Tecnología de Materiales (i); Argentina. Universidad Nacional de Mar del Plata; Argentina
Fil: Meichtry, Jorge Martin. Comision Nacional de Energia Atomica. Gerencia Quimica. CAC; Argentina
Fil: Grela, Maria Alejandra. Universidad Nacional de Mar del Plata; Argentina
Fil: Litter, Marta Irene. Comisión Nacional de Energía Atómica. Gerencia del _rea de Seguridad Nuclear y Ambiente. Gerencia de Química (cac); Argentina
Fil: San Roman, Enrique Arnoldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina
description As previous studies have shown, the photocatalytic reduction of Cr(VI) to Cr(III) in the presence of 4-chlorophenol can be carried out efficiently under visible irradiation using TiO2 modified with hydroxoaluminum-tricarboxymonoamide phthalocyanine (AlTCPc) in spite of the high aggregation tendency of the dye. In the present work, photocurrent and absorption spectra of AlTCPc modified TiO2 films are studied together with absorption and fluorescence of the dye in solution as a function of the concentration of the dye to clarify (a) the role of aggregates and the nature of the species responsible for electron injection into the semiconductor and (b) the reasons why, as reported earlier, the photocatalytic activity is nearly independent of dye loading at constant TiO2 mass. Results are consistent with the presence of AlTCPc clusters with similar properties both on the TiO2 surface and in H2O?DMSO solution. The actual photoactive species is the monomeric dye electronically coupled to the semiconductor. Monomer concentration depends only slightly on AlTCPc analytical concentration, in a way similar to surfactant monomers in micellar equilibrium, thus explaining the independence of photocatalytic activity on dye concentration.
publishDate 2013
dc.date.none.fl_str_mv 2013-10
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/11336/8268
Rodriguez, Hernan Bernardo; Di Iorio, Yesica Dolores; Meichtry, Jorge Martin; Grela, Maria Alejandra; Litter, Marta Irene; et al.; Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine; Royal Society Of Chemistry; Photochemical And Photobiological Sciences; 12; 11; 10-2013; 1984-1990
1474-905X
url http://hdl.handle.net/11336/8268
identifier_str_mv Rodriguez, Hernan Bernardo; Di Iorio, Yesica Dolores; Meichtry, Jorge Martin; Grela, Maria Alejandra; Litter, Marta Irene; et al.; Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine; Royal Society Of Chemistry; Photochemical And Photobiological Sciences; 12; 11; 10-2013; 1984-1990
1474-905X
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://pubs.rsc.org/en/Content/ArticleLanding/2013/PP/c3pp50191d#!divAbstract
info:eu-repo/semantics/altIdentifier/doi/10.1039/C3PP50191D
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
dc.publisher.none.fl_str_mv Royal Society Of Chemistry
publisher.none.fl_str_mv Royal Society Of Chemistry
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
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score 13.13397

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