Silver functionalized titania-silica xerogels: Preparation, morpho-structural and photocatalytic properties, kinetic modeling

Preparation, morpho-structural and photo-characterization of Ag/TiO2–SiO2 (0.5–1wt%) composites were reported. The silver ions were reduced on the titania–silica surface in two different routes. The best Ag/TiO2–SiO2 photocatalysts must have high specific surface area and low Ag content, when the Ag...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-11, Vol.648, p.890-902
Main Authors: Peter, Anca, Mihaly-Cozmuta, Leonard, Mihaly-Cozmuta, Anca, Nicula, Camelia, Cadar, Calin, Jastrzębska, Agnieszka, Kurtycz, Patrycja, Olszyna, Andrzej, Vulpoi, Adriana, Danciu, Virginia, Radu, Teodora, Baia, Lucian
Format: Article
Language:English
Subjects:
Activation energy
Alloys
Isolated Ag nanoparticles
Nanoparticles
Nanostructured Ag/TiO2–SiO2 composites
Photoactivity
Photocatalysis
Photocatalysts
Silver
Sol–gel growth
Surface chemistry
Texts
Titanium dioxide
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Summary:Preparation, morpho-structural and photo-characterization of Ag/TiO2–SiO2 (0.5–1wt%) composites were reported. The silver ions were reduced on the titania–silica surface in two different routes. The best Ag/TiO2–SiO2 photocatalysts must have high specific surface area and low Ag content, when the Ag nanoparticles homogeneous dispersed onto the mixed oxide surface generates an oxidation state of titanium (TiAg4+), that improves the charge carriers transfer, thus increasing their photoactivity. A negative value of the activation energy suggested that the temperature does not influence the photoactivity of the composites. [Display omitted] •New prepared Ag/TiO2–SiO2 composites were characterized.•The most efficient Ag/TiO2–SiO2 photocatalysts should be porous and contain low amount of Ag.•The presence of TiAg4+ state of titanium is the key issue for high photoefficiency of Ag/TiO2–SiO2.•The temperature does not influence the photocatalytic activity of the composites.•High Ag content (0.74 wt%) was found to be detrimental with regard to the photocatalytical efficiency.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.07.022