Indian Journal Of ChemistryVol 49A December
Indian Journal of Chemistry
Vol. 49A, December 2010, pp. 1593-1600
Characterization and photocatalytic activity of SiO2-TiO2 mixed oxide nanoparticles prepared by sol-gel method
Ali Mahyar*, Mohammad Ali Behnajady & Naser Modirshahla
Department of Applied Chemistry, Faculty of Science, Islamic Azad University, Tabriz Branch, Tabriz, Iran
Email: alimahyar@hotmail.com
Received 9 August 2010; revised and accepted 15 November 2010
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. Keywords: Catalysts, Photocatalysts, Mixed oxides, Oxides, Sol-gel method, Photodegradation, Nanocomposites, Titania, Silica
IPC Code: Int. Cl.9 B01J2/08; B01J21/06
Synthetic dyes are toxic refractory chemicals which can generate intense color and are hazardous to the environment. Most of dyes are resistant to aerobic biodegradation1. Heterogeneous photocatalytic detoxification
Vol. 49A, December 2010, pp. 1593-1600
Characterization and photocatalytic activity of SiO2-TiO2 mixed oxide nanoparticles prepared by sol-gel method
Ali Mahyar*, Mohammad Ali Behnajady & Naser Modirshahla
Department of Applied Chemistry, Faculty of Science, Islamic Azad University, Tabriz Branch, Tabriz, Iran
Email: alimahyar@hotmail.com
Received 9 August 2010; revised and accepted 15 November 2010
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. Keywords: Catalysts, Photocatalysts, Mixed oxides, Oxides, Sol-gel method, Photodegradation, Nanocomposites, Titania, Silica
IPC Code: Int. Cl.9 B01J2/08; B01J21/06
Synthetic dyes are toxic refractory chemicals which can generate intense color and are hazardous to the environment. Most of dyes are resistant to aerobic biodegradation1. Heterogeneous photocatalytic detoxification
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