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Role of particle size in visible light photocatalysis of Congo Red using TiO(2)center dot[ZnFe(2)O(4)] (x) nanocomposites

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Title Role of particle size in visible light photocatalysis of Congo Red using TiO(2)center dot[ZnFe(2)O(4)] (x) nanocomposites
 
Creator NARAYAN, H
ALEMU, H
MACHELI, L
SEKOTA, M
THAKURDESAI, M
RAO, TKG
 
Subject tio2
dye
titanium dioxide
nanocomposite
photocatalysis
 
Description TiO(2)center dot[ZnFe(2)O(4)] (x) (x = 0 center dot 0-0 center dot 5) nanocomposites (NCs) with an average particle size of 72 center dot 4 nm were synthesized by the method of co-precipitation/hydrolysis (CPH). For the comparison of particle-size dependent effects, a set of polycrystalline samples with similar compositions was also prepared by solid state reaction (SSR) route. Average particle size for SSR prepared samples was about 3 center dot 0 A mu m. All the samples were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), particle size analyzer, Raman spectroscopy and Fourier transform infra-red (FTIR) spectroscopy. Their visible light photocatalytic activity was tested for the degradation of Congo Red dye. Maximum photodegradation was observed for the NC with x = 0 center dot 1 synthesized by CPH (particle size, 71 nm). Similar composition prepared by SSR method (particle size, 6 center dot 19 A mu m) showed lower photoactivity in comparison even with that observed for pure TiO(2) (particle size, 4 center dot 03 A mu m). It was, therefore, concluded that enhanced photodegradation is directly related to the reduced particle size of the composites, which implies that photosensitization is the process primarily involved. Although, doping of TiO(2) with ZnFe(2)O(4) does extend the cut-off wavelength towards visible parts of the spectrum, its contribution in the enhancement is not as significant as that due to the photosensitization.
 
Publisher INDIAN ACAD SCIENCES
 
Date 2011-08-01T22:54:04Z
2011-12-26T12:53:32Z
2011-12-27T05:39:50Z
2011-08-01T22:54:04Z
2011-12-26T12:53:32Z
2011-12-27T05:39:50Z
2009
 
Type Article
 
Identifier BULLETIN OF MATERIALS SCIENCE, 32(5), 499-506
0250-4707
http://dx.doi.org/10.1007/s12034-009-0074-0
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8567
http://hdl.handle.net/10054/8567
 
Language en