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Kinetics of the photodegradation of substituted phenols by solution combustion synthesized $TiO_2$

Sivalingam, G and Priya, MH and Madras, Giridhar (2004) Kinetics of the photodegradation of substituted phenols by solution combustion synthesized $TiO_2$. In: Applied Catalysis B: Environmental, 51 (1). pp. 67-76.

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Abstract

A nano-sized, high surface area phase pure anatase $TiO_2$ synthesized by the solution combustion method was used to study the photocatalytic degradation of various chlorophenols and methylphenols. The photocatalytic degradation rates of o-chlorophenol, p-chlorophenol, dichlorophenol, trichlorophenol, pentachlorophenol, o- and m-methylphenol (cresol) under UV exposure were determined using the combustion synthesized $TiO_2$ and compared with the degradation rates with commercial Degussa P-25. The chlorophenols degraded much faster than the methylphenols, which degraded faster than phenol. The photocatalytic activity of combustion synthesized $TiO_2$ was significantly higher than that of Degussa P-25 under similar conditions. No intermediates were observed when combustion synthesized $TiO_2$ catalyst was used for the photocatalytic degradation of the phenols, while several intermediates were observed for the same reactions catalyzed by Degussa P-25. Because some of the intermediates are toxic, combustion synthesized $TiO_2$ may be more beneficial in environmental catalysis. The mechanisms for the photocatalytic degradation were proposed and the kinetic parameters were determined by regressing the experimental data.

Item Type: Journal Article
Additional Information: The copyright belongs to Elsevier.
Keywords: Solution combustion method;Substituted phenols;Photocatalytic degradation;Kinetic analysis
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 06 May 2006
Last Modified: 19 Sep 2010 04:26
URI: http://eprints.iisc.ernet.in/id/eprint/6580

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