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Photocatalytic degradation of various dyes by combustion synthesized nano anatase $TiO_2$

Sivalingam, G and Nagaveni, K and Hegde, MS and Madras, Giridhar (2003) Photocatalytic degradation of various dyes by combustion synthesized nano anatase $TiO_2$. In: Applied Catalysis B: Environmental, 45 (1). pp. 23-38.

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The 8–10 nm pure anatase phase titania with $156 m^2/g$ BET surface area was prepared by solution combustion method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and BET surface area. This catalyst was used for the photocatalytic degradation of various dyes such as heteropolyaromatic dye (Methylene blue), anthraquinonic dye (Alizarin S), and azoic dyes (Methyl red, Congo red, and Orange G). The effect of catalyst loading, initial concentrations of the dyes, pH, and transition metal doping on $TiO_2$ was investigated. Substitution of $TiO_2$ with transition metal had a detrimental effect on the photocatalytic activity. However, this inhibition effect was not observed with Pt impregnated $TiO_2$. This was attributed to the metals being in ionic state in metal substituted $TiO_2$ synthesized by combustion method, and zero state of metal in impregnated catalysts as evidenced by XPS study. The degradation of dyes was also investigated in solar exposure. The photoactivity of the combustion synthesized titania was higher than commercial $TiO_2$(Degussa P-25) for both UV and solar exposure. The experimental data followed Langmuir–Hinshelwood (L–H) rate form and the kinetic parameters were obtained.

Item Type: Journal Article
Publication: Applied Catalysis B: Environmental
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Nano-size anatase TiO2;Solution combustion method;Photocatalysis;Transition metal doping;Langmuir–Hinshelwood model
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 24 May 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ac.in/id/eprint/11061

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