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Structural and Photocatalytic Activity of Lanthanide (Ce, Pr, and Nd) Molybdovanadates

Mahapatra, Sudarshan and Madras, Giridhar and Row, Guru TN (2007) Structural and Photocatalytic Activity of Lanthanide (Ce, Pr, and Nd) Molybdovanadates. In: The Journal of Physical Chemistry C, 111 (17). pp. 6505-6511.

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Abstract

Lanthanide (Ce, Pr, and Nd) molybdovanadates were synthesized by the solid-state method. These compounds crystallize in the tetragonal space group $I4_1/amd$ with a = b = 7.3750 (4) and c = 6.4867 (4)\AA and Z = 4. The crystal structure has been analyzed by FTIR, UV-visible spectroscopy, and powder X-ray diffraction. Particle sizes are in the range of 300-400 nm as observed by scanning electron microscopy. Energy-dispersive X-ray analysis suggests the formation of $Ln_{0.95}Mo_{0.15}V_{0.85}O_4$ (Ln = Ce, Pr, and Nd) and the Rietveld refinements of the powder X-ray data substantiate this observation. Thermal analysis of these solids shows stability of the phase up to $800^o C$. These materials were investigated for photocatalytic activity by degrading different dyes such as methylene blue(MB), orange G (OG), Rhodamine B (RB), Rhodamine Blue (RBL) Alizarine Red S (ARS), and Remazol brilliant blue (RBBR) under solar and UV irradiation since they exhibited lower band gaps. The degradation rates for all the dyes show enhancement as compared to the commercial titania catalyst, Degussa P-25, both in UV and sunlight. These compounds degrade chlorinated phenols much faster than titania, which indicates selectivity toward chloro substitution.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 21 Aug 2007
Last Modified: 19 Sep 2010 04:39
URI: http://eprints.iisc.ernet.in/id/eprint/11717

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