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Mechanochemical Synthesis, Structural Characterization and Visible Light Photocatalysis of TiO2/ZnFe2O4 Nnanocomposites

Published online by Cambridge University Press:  01 February 2011

Sesha S. Srinivasan ,
Nikolai Kislov ,
Jeremy Wade ,
Matthew Smith ,
Elias Stefanakos  and
Yogi Goswami
Sesha S. Srinivasan
Affiliation:
sesha@eng.usf.edu, University of South Florida, 4202 E. Fowler Ave, Tampa, FL, 33620, United States
Nikolai Kislov
Affiliation:
nikolai@eng.usf.edu
Jeremy Wade
Affiliation:
wadetbr@hotmail.com
Matthew Smith
Affiliation:
masmith@eng.usf.edu
Elias Stefanakos
Affiliation:
stefanak@eng.usf.edu
Yogi Goswami
Affiliation:
goswami@ufl.edu
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Abstract

Nanocomposite heterogeneous semiconductors with suitable energy levels (gaps) are exhibiting excellent photocatalytic properties under visible light irradiation. TiO2/ZnFe2O4 has been selected among different alloys because of (i) its low band gap ∼1.9 eV (ii) the nontoxicity of ZnFe2O4 (iii) visible light absorption characteristics of ZnFe2O4 due to its narrow band gap and (iv) not being susceptible to photoanodic corrosion. A mechanochemical synthesis approach using high energy milling is employed to prepare TiO2/ZnFe2O4 under different experimental parameters and conditions. The effects of ball milling and calcination on the photocatalytic behavior of TiO2 and TiO2/ZnFe2O4 have been determined. The as-milled nanocomposite materials are characterized with PXD, SEM and EDS procedures. The photocatalytic activity of TiO2/ZnFe2O4 nanocomposites for the photodegradation of phenol under visible light irradiation has been studied systematically by UV-Vis spectrometer. It is interesting to note a red shift of 0.25 eV in the absorption edge of the ball-milled TiO2 sample when compared to the non ball milled TiO2 photocatalyst.

Keywords

catalyticmechanical alloyingnanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 900: Symposium O – Nanoparticles and Nanostructures in Sensors and Catalysis , 2005 , 0900-O09-23
Copyright
Copyright © Materials Research Society 2006

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References

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