Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/10725
Title: Characterization and photocatalytic activity of SiO<sub>2</sub>-TiO<sub>2</sub> mixed oxide nanoparticles prepared by sol-gel method
Authors: Mahyar, Ali
Behnajady, Mohammad Ali
Modirshahla, Naser
Keywords: Catalysts
Photocatalysts
Mixed oxides
Oxides
Sol-gel method
Photodegradation
Nanocomposites
Titania
Silica
Issue Date: Dec-2010
Publisher: NISCAIR-CSIR, India
Series/Report no.: Int. Cl.<sup>9</sup> B01J2/08; B01J21/06
Abstract: SiO<sub>2</sub>-TiO<sub>2</sub> mixed oxides have been prepared by sol-gel technique from titanium tetraisopropoxide and tetraethylorthosilicate. The prepared materials were characterized by X-ray diffraction, FT-IR spectroscopy, scanning electron microscopy, nitrogen physisorption and UV-vis diffuse reflectance spectroscopy. The results indicate that compared to pure TiO<sub>2</sub>, the SiO<sub>2</sub>-TiO<sub>2</sub> mixed oxides show higher thermal stability, larger surface area, greater band gap energy and smaller crystallite size. The higher thermal stability of SiO<sub>2</sub>-TiO<sub>2</sub> nanoparticles allows calcination of SiO<sub>2</sub>-TiO<sub>2</sub> nanoparticles at higher temperatures without the accompanying phase transformations from anatase to rutile. The photocatalytic activity of the prepared materials has been compared in the photodegradation of new fuchsin (C.I. 42520) and amaranth (C.I. 16185). Effects of SiO<sub>2</sub> concentration and calcination temperature on the photocatalytic activity of SiO<sub>2</sub>-TiO<sub>2</sub> nanoparticles have been investigated. The photodegradation rate of new fuchsin in the presence of 40% SiO<sub>2</sub>-TiO<sub>2</sub> nanoparticles calcined at 600 ºC was higher than that observed with pure TiO<sub>2</sub> and Degussa P25 TiO<sub>2</sub> by 7.9 and 3.27 times, respectively.
Description: 1593-1600
URI: http://hdl.handle.net/123456789/10725
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.49A(12) [December 2010]

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