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Photocatalytic Degradation of Organic ompounds over Combustion-Synthesized Nano-$TiO_2$

Nagaveni, K and Sivalingam, G and Hegde, MS and Madras, Giridhar (2004) Photocatalytic Degradation of Organic ompounds over Combustion-Synthesized Nano-$TiO_2$. In: Environmental Science and Technology, 38 (5). pp. 1600-1604.

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Abstract

The photocatalytic degradation of various organics such as phenol, p-nitrophenol, and salicylic acid was carried out with combustion-synthesized nano-$TiO_2$ under UV and solar exposure. Under identical conditions of UV exposure, the initial degradation rate of phenol with combustionsynthesized $TiO_2$ is 2 times higher than the initial degradation rate of phenol with commercial Degussa P-25 $TiO_2.$ The intermediates such as catechol (CC) and hydroquinone (HQ) were not detected during the degradation of phenol with combustion-synthesized $TiO_2,$ while both the intermediates were detected when phenol was degraded over Degussa P-25. This indicates that the rates of secondary photolysis of CC and HQ occur extremely faster than the rates at which they are formed from phenol and further implies that the primary hydroxylation step is rate limiting for the combustion-synthesized $TiO_2$ aided photodegradation of phenol. The degradation rates of salicylic acid and p-nitrophenol were also investigated, and the rates were higher for combustion-synthesized titania compared to Degussa P-25 $TiO_2.$ Superior activity of combustionsynthesized $TiO_2$ toward photodegradation of organic compounds can be attributed to crystallinity, higher surface area, more surface hydroxyl groups, and optical absorption at higher wavelength.

Item Type: Journal Article
Additional Information: The copyright belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 30 May 2006
Last Modified: 19 Sep 2010 04:27
URI: http://eprints.iisc.ernet.in/id/eprint/7105

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