Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/735
Title: An aqueous sol-gel synthesis of chromium (III) doped mesoporous titanium dioxide for visible light photocatalysis
Authors: Jaimy, K B
Ghosh, S K
Sankar, S
Warrier, K G K
Keywords: Oxides
Sol-gel chemistry
Catalytic properties
Nanocrystalline titania
TIO2 nanoparticles
Metal-ions
Degradation
Anatase
Photodegradation
Reactivity
Irradiation
Issue Date: 2011
Publisher: Elsevier
Citation: Materials Research Bulletin 46(6):914-921;Jun 2011
Abstract: Nanoparticles of titanium dioxide doped with Cr (3+) ions have been prepared through an aqueous sol-gel method. The mesoporous nature of both pure and Cr(3+) doped TiO(2) powders, with specific surface area of 7.4 and 6.6 m(2) g(-1), respectively, is maintained even at calcination temperature of 800 degrees C. The transformation of TiO(2) from the anatase to rutile phase is suppressed up to 800 degrees C by Cr(3+) ion doping. Even though surface area values are decreased, the doped materials show improved photocatalytic activity, which may be due to increased crystallinity of the anatase phase without the formation of rutile. Doped materials have a red-shift in the band gap energy and hence, photoactivity under visible light. The rate of photodegradation of methylene blue dye for both pure and doped TiO(2) under visible light has been monitored in this study. The 0.25 mol% Cr(III) doped photocatalyst, calcined at 800 degrees C, shows the highest photocatalytic activity under visible light with a rate constant of similar to 15.8 x 10(-3) min(-1), which is nearly three times higher than that of commercially available Degussa P25 titania (5.8 x 10(-3) min(-1).
URI: http://ir.niist.res.in:8080/jspui/handle/123456789/735
ISSN: 0025-5408
Appears in Collections:2011

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