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dc.contributor.author
Fuchs, Vanesa Maria  
dc.contributor.author
Mendez, Leticia Jesica  
dc.contributor.author
Blanco, Mirta Noemi  
dc.contributor.author
Pizzio, Luis Rene  
dc.date.available
2018-08-03T15:09:21Z  
dc.date.issued
2009-04  
dc.identifier.citation
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  
dc.identifier.issn
0926-860X  
dc.identifier.uri
http://hdl.handle.net/11336/54060  
dc.description.abstract
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.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier Science  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Mesoporous Titania  
dc.subject
Photocatalyst  
dc.subject
Tungstophosphoric Acid  
dc.subject
Urea  
dc.subject.classification
Otras Ingeniería Química  
dc.subject.classification
Ingeniería Química  
dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS  
dc.title
Mesoporous titania directly modified with tungstophosphoric acid: Synthesis, characterization and catalytic evaluation  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2018-07-11T15:11:43Z  
dc.journal.volume
358  
dc.journal.number
1  
dc.journal.pagination
73-78  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
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  
dc.description.fil
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  
dc.description.fil
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  
dc.description.fil
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  
dc.journal.title
Applied Catalysis A: General  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.apcata.2009.01.040  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0926860X09000945