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Microwave Synthesis and Photocatalytic Activity of Nano Lanthanide (Ce, Pr, and Nd) Orthovanadates

Mahapatra, Sudarshan and Nayak, Susanta K and Madras, Giridhar and Row, Guru TN (2008) Microwave Synthesis and Photocatalytic Activity of Nano Lanthanide (Ce, Pr, and Nd) Orthovanadates. In: Industrial & Engineering Chemistry Research, 47 (17). pp. 6509-6516.

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Official URL: http://pubs.acs.org/cgi-bin/article.cgi/iecred/200...

Abstract

Lanthanide orthovanadates, $CeVO_4$, $PrVO_4$, and $NdVO_4$, of nanodimensions were synthesized under microwave exposure, and the photocatalytic activities of these compounds were investigated. These compounds exhibit a tetragonal zircon structure, crystallizing in the space group $I4_1/amd$ with a = 7.3733(4) and $c = 6.4909(4) \AA$ with Z = 4. The crystal structure was analyzed by powder X-ray diffraction, and the band gap was analyzed by UV-visible spectroscopy. Particle sizes were in the range of 25-30 nm, as observed by transmission electron microscopy. While the energy dispersive X-ray analysis indicates the formation of $LnVO_4$, thermal analysis of these solids shows stability of the phase up to $1000^o C$. The photocatalytic activity of all these orthovanadates has been investigated by degrading various dyes like methylene blue (MB), Orange G (OG), Rhodamine B (RB), Rhodamine Blue(RBL), and Remazol brilliant blue (RBBR) under UV irradiation. Further,these compounds were also used to degrade organic pollutants like phenol, 2,4-dinitrophenol and 2,4-dichlorophenol. The degradation rates of dyes and organics in presence of microwave-synthesized orthovanadates are higher compared to that observed with orthovanadates synthesized by the solid state technique. The microwave-synthesized orthovandates also show chloro-specificity, with the rate of degradation of 2,4-dichlorophenol significantly higher than that observed in presence of Degussa P-25 titania.

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: 14 Oct 2008 06:55
Last Modified: 19 Sep 2010 04:50
URI: http://eprints.iisc.ernet.in/id/eprint/15982

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