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Journal of Nanomaterials
Volume 2006, Article ID 45712, 4 pages
http://dx.doi.org/10.1155/JNM/2006/45712

Synthesis and Characterization of Photocatalytic TiO2-ZnFe2O4 Nanoparticles

Clean Energy Research Center, College of Engineering, University of South Florida, Tampa, FL 33620, USA

Received 20 January 2006; Revised 29 June 2006; Accepted 13 July 2006

Copyright © 2006 Sesha S. Srinivasan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A new coprecipitation/hydrolysis synthesis route is used to create a TiO2-ZnFe2O4 nanocomposite that is directed towards extending the photoresponse of TiO2 from UV to visible wavelengths (>400nm). The effect of TiO2's accelerated anatase-rutile phase transformation due to the presence of the coupled ZnFe2O4 narrow-bandgap semiconductor is evaluated. The transformation's dependence on pH, calcinations temperature, particle size, and ZnFe2O4 concentration has been analyzed using XRD, SEM, and UV-visible spectrometry. The requirements for retaining the highly photoactive anatase phase present in a ZnFe2O4 nanocomposite are outlined. The visible-light-activated photocatalytic activity of the TiO2-ZnFe2O4 nanocomposites has been compared to an Aldrich TiO2 reference catalyst, using a solar-simulated photoreactor for the degradation of phenol.