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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.49A [2010] >
IJC-A Vol.49A(12) [December 2010] >
| Title: | Characterization and photocatalytic activity of SiO2-TiO2 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 |
| IPC Code: | Int. Cl.9 B01J2/08; B01J21/06 |
| Abstract: | SiO2-TiO2 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 TiO2, the SiO2-TiO2
mixed oxides show higher thermal stability, larger surface area, greater band
gap energy and smaller crystallite size. The higher thermal stability of SiO2-TiO2
nanoparticles allows calcination of SiO2-TiO2
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 SiO2 concentration and
calcination temperature on the photocatalytic activity of SiO2-TiO2
nanoparticles have been investigated. The photodegradation rate of new fuchsin
in the presence of 40% SiO2-TiO2 nanoparticles calcined
at 600 ºC was higher than that observed with pure TiO2 and Degussa
P25 TiO2 by 7.9 and 3.27 times, respectively. |
| Page(s): | 1593-1600 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.49A(12) [December 2010]
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