Enhanced Photocatalytic Properties due to Electron-rich Ti-ion Doping in ZnFe2O4 under Visible Light Irradiation
J. Korean Phy. Soc. 2011; 59: 2750~2755
Published online October 14, 2011 © 2011 The Korean Physical Society.

Abstract
The substitution effect of Ti4+ at Fe3+ site in ZnFe2O4, a spinel-phase system, has been studied and further optimized to fabricate an efficient photocatalyst. The material doped with electron donor (Ti+4), ZnFe2 − xTixO4 with an optimum composition of x=0.06 exhibited a unchanged band gap, but generated two times higher photocurrent, and showed enhanced quantum yield (upto 0.77%) for photodecomposition of H2O-CH3OH mixture, than undoped material under visible light ((¥ë¡Ã420 nm). In contrast, the material doped with very high concentration of Ti revealed deteriorated photochemical properties due to constituent impurity phases. The higher electron density by n-type doping seems to be responsible for the more efficient charge separation in ZnFe2−xTixO4 (0.01 £¼ x £¼ 0.09), and hence, the high photocatalytic activity.
Keywords: ZnFe2O4, Visible light, Photocatalytic activity, Photocatalysts, ,


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