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Solar photocatalytic degradation of dyes: high activity of combustion synthesized nano $TiO_2$

Nagaveni, K and Sivalingam, G and Hegde, MS and Madras, Giridhar (2004) Solar photocatalytic degradation of dyes: high activity of combustion synthesized nano $TiO_2$. In: Applied Catalysis B: Environmental, 48 (2). pp. 83-93.

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Abstract

The solar photocatalytic degradation of various dyes such as methylene blue (MB), remazol brill blue R (RBBR) and orange G (OG) has been studied over combustion synthesized nano $TiO_2$ and the activity was compared with that of commercial Degussa P-25 $TiO_2$ under similar conditions. The effect of catalyst loading, initial concentrations of the dyes and the deactivation studies of the catalysts were also investigated. The catalyst was characterized by techniques like X-ray diffraction (XRD), BET, gravimetric-differential thermal analysis (TG-DTA), IR and UV absorption. The initial degradation rates with combustion synthesized nano $TiO_2$ was 20 times higher for RBBR, 4 times higher for MB and 1.6 times higher for OG, compared to Degussa P-25 $TiO_2$. The enhanced photocatalytic activity of combustion synthesized catalyst is attributed to the crystallinity, nano-size, large amount of surface hydroxyl species and reduced band-gap.

Item Type: Journal Article
Additional Information: The copyright belongs to Elsevier.
Keywords: Nano-size anatase TiO2;Solution combustion method;Solar photocatalysis;Surface hydroxyl species
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 25 May 2006
Last Modified: 19 Sep 2010 04:27
URI: http://eprints.iisc.ernet.in/id/eprint/6903

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