Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation

Autores
Fuchs, Vanesa Maria; Mendez, Leticia Jesica; Blanco, Mirta Noemi; Pizzio, Luis Rene
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The materials were synthesized by the sol-gel method, using titanium isopropoxide as precursor and urea as pore-forming agent. During the gelation, an alcoholic solution of tungstophosphoric acid (TPA) was added. Its concentration was varied in order to obtain TPA contents of 0, 10, 20 and 30% (w/w) in the solid. The urea was extracted with water and the solids were thermally treated between 100 and 600 °C. Mesoporous solids were obtained, with a mean pore diameter (Dp) larger than 3.1 nm. The specific surface area (SBET) decreased and Dp slightly increased when the TPA content was raised. SBET also diminished when the calcination temperature was increased, the decrease being lower for higher TPA contents. The X-ray diffraction patterns of the solids modified with TPA only presented the characteristic peaks of the anatase phase. The crystalline degree and the crystal size increased for higher calcination temperatures. According to the Fourier transform infrared and 31P magic angle spinning-nuclear magnetic resonance spectra, the [PW12O40]3- species is the one mainly present in the solids. The band gap values obtained from the UV-vis diffuse reflectance spectra are slightly lower than those reported for the anatase phase. The catalytic activity of the materials in the photodegradation of methyl orange was higher when the TPA content and the calcination temperature of the samples were raised. The lower recombination degree of the photogenerated electrons and holes caused by the increase in the crystalline degree, implying a lower number of defects which act as recombination centers, and in the modified samples by TPA, due to its effect as charge trapping center, added to lower band gap values, are the main effects responsible for the activity increase. © 2009 Elsevier B.V. All rights reserved.
Fil: Fuchs, Vanesa Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Mendez, Leticia Jesica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Blanco, Mirta Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Pizzio, Luis Rene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Materia
Mesoporous Titania
Photocatalyst
Tungstophosphoric Acid
Urea
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:11336/54060
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/54060
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluationFuchs, Vanesa MariaMendez, Leticia JesicaBlanco, Mirta NoemiPizzio, Luis ReneMesoporous TitaniaPhotocatalystTungstophosphoric AcidUreahttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2The materials were synthesized by the sol-gel method, using titanium isopropoxide as precursor and urea as pore-forming agent. During the gelation, an alcoholic solution of tungstophosphoric acid (TPA) was added. Its concentration was varied in order to obtain TPA contents of 0, 10, 20 and 30% (w/w) in the solid. The urea was extracted with water and the solids were thermally treated between 100 and 600 °C. Mesoporous solids were obtained, with a mean pore diameter (Dp) larger than 3.1 nm. The specific surface area (SBET) decreased and Dp slightly increased when the TPA content was raised. SBET also diminished when the calcination temperature was increased, the decrease being lower for higher TPA contents. The X-ray diffraction patterns of the solids modified with TPA only presented the characteristic peaks of the anatase phase. The crystalline degree and the crystal size increased for higher calcination temperatures. According to the Fourier transform infrared and 31P magic angle spinning-nuclear magnetic resonance spectra, the [PW12O40]3- species is the one mainly present in the solids. The band gap values obtained from the UV-vis diffuse reflectance spectra are slightly lower than those reported for the anatase phase. The catalytic activity of the materials in the photodegradation of methyl orange was higher when the TPA content and the calcination temperature of the samples were raised. The lower recombination degree of the photogenerated electrons and holes caused by the increase in the crystalline degree, implying a lower number of defects which act as recombination centers, and in the modified samples by TPA, due to its effect as charge trapping center, added to lower band gap values, are the main effects responsible for the activity increase. © 2009 Elsevier B.V. All rights reserved.Fil: Fuchs, Vanesa Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Mendez, Leticia Jesica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Blanco, Mirta Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Pizzio, Luis Rene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaElsevier Science2009-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/54060Fuchs, Vanesa Maria; Mendez, Leticia Jesica; Blanco, Mirta Noemi; Pizzio, Luis Rene; Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation; Elsevier Science; Applied Catalysis A: General; 358; 1; 4-2009; 73-780926-860XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2009.01.040info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X09000945info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:59:15Zoai:ri.conicet.gov.ar:11336/54060instacron: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 09:59:16.183CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation
title Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation
spellingShingle Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation
Fuchs, Vanesa Maria
Mesoporous Titania
Photocatalyst
Tungstophosphoric Acid
Urea
title_short Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation
title_full Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation
title_fullStr Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation
title_full_unstemmed Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation
title_sort Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation
dc.creator.none.fl_str_mv Fuchs, Vanesa Maria
Mendez, Leticia Jesica
Blanco, Mirta Noemi
Pizzio, Luis Rene
author Fuchs, Vanesa Maria
author_facet Fuchs, Vanesa Maria
Mendez, Leticia Jesica
Blanco, Mirta Noemi
Pizzio, Luis Rene
author_role author
author2 Mendez, Leticia Jesica
Blanco, Mirta Noemi
Pizzio, Luis Rene
author2_role author
author
author
dc.subject.none.fl_str_mv Mesoporous Titania
Photocatalyst
Tungstophosphoric Acid
Urea
topic Mesoporous Titania
Photocatalyst
Tungstophosphoric Acid
Urea
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The materials were synthesized by the sol-gel method, using titanium isopropoxide as precursor and urea as pore-forming agent. During the gelation, an alcoholic solution of tungstophosphoric acid (TPA) was added. Its concentration was varied in order to obtain TPA contents of 0, 10, 20 and 30% (w/w) in the solid. The urea was extracted with water and the solids were thermally treated between 100 and 600 °C. Mesoporous solids were obtained, with a mean pore diameter (Dp) larger than 3.1 nm. The specific surface area (SBET) decreased and Dp slightly increased when the TPA content was raised. SBET also diminished when the calcination temperature was increased, the decrease being lower for higher TPA contents. The X-ray diffraction patterns of the solids modified with TPA only presented the characteristic peaks of the anatase phase. The crystalline degree and the crystal size increased for higher calcination temperatures. According to the Fourier transform infrared and 31P magic angle spinning-nuclear magnetic resonance spectra, the [PW12O40]3- species is the one mainly present in the solids. The band gap values obtained from the UV-vis diffuse reflectance spectra are slightly lower than those reported for the anatase phase. The catalytic activity of the materials in the photodegradation of methyl orange was higher when the TPA content and the calcination temperature of the samples were raised. The lower recombination degree of the photogenerated electrons and holes caused by the increase in the crystalline degree, implying a lower number of defects which act as recombination centers, and in the modified samples by TPA, due to its effect as charge trapping center, added to lower band gap values, are the main effects responsible for the activity increase. © 2009 Elsevier B.V. All rights reserved.
Fil: Fuchs, Vanesa Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Mendez, Leticia Jesica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Blanco, Mirta Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Pizzio, Luis Rene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
description The materials were synthesized by the sol-gel method, using titanium isopropoxide as precursor and urea as pore-forming agent. During the gelation, an alcoholic solution of tungstophosphoric acid (TPA) was added. Its concentration was varied in order to obtain TPA contents of 0, 10, 20 and 30% (w/w) in the solid. The urea was extracted with water and the solids were thermally treated between 100 and 600 °C. Mesoporous solids were obtained, with a mean pore diameter (Dp) larger than 3.1 nm. The specific surface area (SBET) decreased and Dp slightly increased when the TPA content was raised. SBET also diminished when the calcination temperature was increased, the decrease being lower for higher TPA contents. The X-ray diffraction patterns of the solids modified with TPA only presented the characteristic peaks of the anatase phase. The crystalline degree and the crystal size increased for higher calcination temperatures. According to the Fourier transform infrared and 31P magic angle spinning-nuclear magnetic resonance spectra, the [PW12O40]3- species is the one mainly present in the solids. The band gap values obtained from the UV-vis diffuse reflectance spectra are slightly lower than those reported for the anatase phase. The catalytic activity of the materials in the photodegradation of methyl orange was higher when the TPA content and the calcination temperature of the samples were raised. The lower recombination degree of the photogenerated electrons and holes caused by the increase in the crystalline degree, implying a lower number of defects which act as recombination centers, and in the modified samples by TPA, due to its effect as charge trapping center, added to lower band gap values, are the main effects responsible for the activity increase. © 2009 Elsevier B.V. All rights reserved.
publishDate 2009
dc.date.none.fl_str_mv 2009-04
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/11336/54060
Fuchs, Vanesa Maria; Mendez, Leticia Jesica; Blanco, Mirta Noemi; Pizzio, Luis Rene; Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation; Elsevier Science; Applied Catalysis A: General; 358; 1; 4-2009; 73-78
0926-860X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/54060
identifier_str_mv Fuchs, Vanesa Maria; Mendez, Leticia Jesica; Blanco, Mirta Noemi; Pizzio, Luis Rene; Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation; Elsevier Science; Applied Catalysis A: General; 358; 1; 4-2009; 73-78
0926-860X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcata.2009.01.040
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X09000945
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
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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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