TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes

Autores
Rengifo Herrera, Julian Andres; Blanco, Mirta Noemi; Wist,Julien; Florian, Pierre; Pizzio, Luis Rene
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
TiO2 nanospherical particles prepared by the sol-gel method were modified with tungstophosphoric (TPA) and tungstosilicic acid (TSA) at 30% (w/w) and then annealed at 500 °C for 2 h. Materials were characterized by multitechniques, such as scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), FT-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), 31P, 1H and 29Si magic angle spinning nuclear magnetic resonance (MAS-NMR). Acidity and isoelectric point measurements were also performed. DRS results showed evidence of visible light absorption of TiO2-TPA and TiO2-TSA. MAS-NMR, XPS and FT-Raman characterization revealed evidence of a strong interaction between the Keggin anion of TPA or TSA and TiO2 surfaces, possibly promoted by the formation of surface heteropolyacid-TiO2 complexes; the latter should be responsible of its visible light absorption. Photocatalytic activity was evaluated in the degradation of malachite green (MG), a cationic triphenylmethane dye, and 4-chlorophenol (4-CP) aqueous solutions under UV-A and visible light irradiations. Under UV-A light, TPA-TiO2 and TSA-TiO2 materials showed high photocatalytic activity towards MG degradation, even higher than that of TiO2 P-25. When 4-CP was degraded, TiO2 P-25 exhibited higher photocatalytic activity. Under visible light irradiation and using the modified photocatalysts, malachite green oxidation was achieved, while 4-chlorophenol reached almost 20% of degradation. Mechanisms of photocatalytic oxidation either under UV-A or visible irradiation are discussed.
Fil: Rengifo Herrera, Julian Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. 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 ; Argentina
Fil: Wist,Julien. Universidad del Valle; Colombia
Fil: Florian, Pierre. Centre National de la Recherche Scientifique; Francia
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 ; Argentina
Materia
Tungstophosphoric Acid
Tungstosilicic Acid
Heterogeneous Photocatalysis
Tio2with Visible Light Absorption
Heteropolyacids
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/45569
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/45569
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexesRengifo Herrera, Julian AndresBlanco, Mirta NoemiWist,JulienFlorian, PierrePizzio, Luis ReneTungstophosphoric AcidTungstosilicic AcidHeterogeneous PhotocatalysisTio2with Visible Light AbsorptionHeteropolyacidshttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2TiO2 nanospherical particles prepared by the sol-gel method were modified with tungstophosphoric (TPA) and tungstosilicic acid (TSA) at 30% (w/w) and then annealed at 500 °C for 2 h. Materials were characterized by multitechniques, such as scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), FT-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), 31P, 1H and 29Si magic angle spinning nuclear magnetic resonance (MAS-NMR). Acidity and isoelectric point measurements were also performed. DRS results showed evidence of visible light absorption of TiO2-TPA and TiO2-TSA. MAS-NMR, XPS and FT-Raman characterization revealed evidence of a strong interaction between the Keggin anion of TPA or TSA and TiO2 surfaces, possibly promoted by the formation of surface heteropolyacid-TiO2 complexes; the latter should be responsible of its visible light absorption. Photocatalytic activity was evaluated in the degradation of malachite green (MG), a cationic triphenylmethane dye, and 4-chlorophenol (4-CP) aqueous solutions under UV-A and visible light irradiations. Under UV-A light, TPA-TiO2 and TSA-TiO2 materials showed high photocatalytic activity towards MG degradation, even higher than that of TiO2 P-25. When 4-CP was degraded, TiO2 P-25 exhibited higher photocatalytic activity. Under visible light irradiation and using the modified photocatalysts, malachite green oxidation was achieved, while 4-chlorophenol reached almost 20% of degradation. Mechanisms of photocatalytic oxidation either under UV-A or visible irradiation are discussed.Fil: Rengifo Herrera, Julian Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. 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 ; ArgentinaFil: Wist,Julien. Universidad del Valle; ColombiaFil: Florian, Pierre. Centre National de la Recherche Scientifique; FranciaFil: Pizzio, Luis Rene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas ; ArgentinaElsevier Science2016-07info: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/11336/45569Rengifo Herrera, Julian Andres; Blanco, Mirta Noemi; Wist,Julien; Florian, Pierre; Pizzio, Luis Rene; TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes; Elsevier Science; Applied Catalysis B: Environmental; 189; 7-2016; 99-1090926-3373CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.apcatb.2016.02.033info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926337316301229info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:47:02Zoai:ri.conicet.gov.ar:11336/45569instacron: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 09:47:02.999CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes
title TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes
spellingShingle TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes
Rengifo Herrera, Julian Andres
Tungstophosphoric Acid
Tungstosilicic Acid
Heterogeneous Photocatalysis
Tio2with Visible Light Absorption
Heteropolyacids
title_short TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes
title_full TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes
title_fullStr TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes
title_full_unstemmed TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes
title_sort TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes
dc.creator.none.fl_str_mv Rengifo Herrera, Julian Andres
Blanco, Mirta Noemi
Wist,Julien
Florian, Pierre
Pizzio, Luis Rene
author Rengifo Herrera, Julian Andres
author_facet Rengifo Herrera, Julian Andres
Blanco, Mirta Noemi
Wist,Julien
Florian, Pierre
Pizzio, Luis Rene
author_role author
author2 Blanco, Mirta Noemi
Wist,Julien
Florian, Pierre
Pizzio, Luis Rene
author2_role author
author
author
author
dc.subject.none.fl_str_mv Tungstophosphoric Acid
Tungstosilicic Acid
Heterogeneous Photocatalysis
Tio2with Visible Light Absorption
Heteropolyacids
topic Tungstophosphoric Acid
Tungstosilicic Acid
Heterogeneous Photocatalysis
Tio2with Visible Light Absorption
Heteropolyacids
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv TiO2 nanospherical particles prepared by the sol-gel method were modified with tungstophosphoric (TPA) and tungstosilicic acid (TSA) at 30% (w/w) and then annealed at 500 °C for 2 h. Materials were characterized by multitechniques, such as scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), FT-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), 31P, 1H and 29Si magic angle spinning nuclear magnetic resonance (MAS-NMR). Acidity and isoelectric point measurements were also performed. DRS results showed evidence of visible light absorption of TiO2-TPA and TiO2-TSA. MAS-NMR, XPS and FT-Raman characterization revealed evidence of a strong interaction between the Keggin anion of TPA or TSA and TiO2 surfaces, possibly promoted by the formation of surface heteropolyacid-TiO2 complexes; the latter should be responsible of its visible light absorption. Photocatalytic activity was evaluated in the degradation of malachite green (MG), a cationic triphenylmethane dye, and 4-chlorophenol (4-CP) aqueous solutions under UV-A and visible light irradiations. Under UV-A light, TPA-TiO2 and TSA-TiO2 materials showed high photocatalytic activity towards MG degradation, even higher than that of TiO2 P-25. When 4-CP was degraded, TiO2 P-25 exhibited higher photocatalytic activity. Under visible light irradiation and using the modified photocatalysts, malachite green oxidation was achieved, while 4-chlorophenol reached almost 20% of degradation. Mechanisms of photocatalytic oxidation either under UV-A or visible irradiation are discussed.
Fil: Rengifo Herrera, Julian Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. 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 ; Argentina
Fil: Wist,Julien. Universidad del Valle; Colombia
Fil: Florian, Pierre. Centre National de la Recherche Scientifique; Francia
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 ; Argentina
description TiO2 nanospherical particles prepared by the sol-gel method were modified with tungstophosphoric (TPA) and tungstosilicic acid (TSA) at 30% (w/w) and then annealed at 500 °C for 2 h. Materials were characterized by multitechniques, such as scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), FT-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), 31P, 1H and 29Si magic angle spinning nuclear magnetic resonance (MAS-NMR). Acidity and isoelectric point measurements were also performed. DRS results showed evidence of visible light absorption of TiO2-TPA and TiO2-TSA. MAS-NMR, XPS and FT-Raman characterization revealed evidence of a strong interaction between the Keggin anion of TPA or TSA and TiO2 surfaces, possibly promoted by the formation of surface heteropolyacid-TiO2 complexes; the latter should be responsible of its visible light absorption. Photocatalytic activity was evaluated in the degradation of malachite green (MG), a cationic triphenylmethane dye, and 4-chlorophenol (4-CP) aqueous solutions under UV-A and visible light irradiations. Under UV-A light, TPA-TiO2 and TSA-TiO2 materials showed high photocatalytic activity towards MG degradation, even higher than that of TiO2 P-25. When 4-CP was degraded, TiO2 P-25 exhibited higher photocatalytic activity. Under visible light irradiation and using the modified photocatalysts, malachite green oxidation was achieved, while 4-chlorophenol reached almost 20% of degradation. Mechanisms of photocatalytic oxidation either under UV-A or visible irradiation are discussed.
publishDate 2016
dc.date.none.fl_str_mv 2016-07
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/11336/45569
Rengifo Herrera, Julian Andres; Blanco, Mirta Noemi; Wist,Julien; Florian, Pierre; Pizzio, Luis Rene; TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes; Elsevier Science; Applied Catalysis B: Environmental; 189; 7-2016; 99-109
0926-3373
CONICET Digital
CONICET
url http://hdl.handle.net/11336/45569
identifier_str_mv Rengifo Herrera, Julian Andres; Blanco, Mirta Noemi; Wist,Julien; Florian, Pierre; Pizzio, Luis Rene; TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes; Elsevier Science; Applied Catalysis B: Environmental; 189; 7-2016; 99-109
0926-3373
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.apcatb.2016.02.033
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926337316301229
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/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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