Synthesis, characterization and photocatalytic activity of MxCe1-xVO4 (M = Li, Ca and Fe)

Mahapatra, Sudarshan and Vinu, R and Saha, Dipankar and Row, TN Guru and Madras, Giridhar (2009) Synthesis, characterization and photocatalytic activity of MxCe1-xVO4 (M = Li, Ca and Fe). In: Applied Catalysis A: General, 361 (1-2). pp. 32-41.

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Abstract

Non-stoichiometric substituted cerium vanadates, MxCe1-xVO4 (M = Li, Ca and Fe), were synthesized by solid-state reactions. The crystal structure was analyzed by powder X-ray diffraction and it exhibits a tetragonal zircon Structure, crystallizing in the space group I4(1)/amd with a = 7.3733(4) and c = 6.4909(4) angstrom and Z = 4. Particle sizes were in the range of 600-800 nm, as observed by scanning electron microscopy. The thermal analysis of the compounds showed phase stability up to 1100 degrees C. The UV diffuse reflectance spectra indicated that the compounds have band gaps in the range of 2.6-2.9 eV. The photocatalytic activity of these Compounds was investigated for the first time for the degradation of different dyes, and organics, the oxidation of cyclohexane and the hydroxylation of benzene. The degradation of dyes was modeled using the Langmuir-Hinshelwood kinetics, while the oxidation of cyclohexane and hydroxylation of benzene were modeled using a free radical mechanism and a series reaction mechanism, respectively.

Item Type:	Journal Article
Publication:	Applied Catalysis A: General
Publisher:	Elsevier Science
Additional Information:	The copyright of this article belongs to Elsevier Science.
Keywords:	Photocatalysis; Photo-oxidation; Orthovanadates; Synthesis
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	04 Jan 2010 12:03
Last Modified:	19 Sep 2010 05:37
URI:	http://eprints.iisc.ac.in/id/eprint/21351

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