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Visible Light Photocatalytic Activity of Manganese Doped TiO2 Nanoparticles
In this paper we report the successful synthesis of manganese (Mn2+) doped TiO2 nanoparticles by sol-gel method. Optical properties of the nanoparticles were characterised by UV-Vis spectrometer in the range 200-900nm and a photoluminescence spectrometer to study the emission spectra of both doped and undoped particles. The UV-Vis spectra of the doped samples shows signature of peaks in the visible region, attributed to the charge transfer transitions between the metal ion d electrons and the conduction or valence band of TiO2. XRD study shows that upon doping with Mn2+ the crystallite size decreases inferring that the dopants effectively inhibits TiO2 grain growth by staying at grain boundaries . Photocatalytic activities of the TiO2 samples modified by Mn2+ ions have been found to be higher than that of pure TiO2.
Keywords
Gel Method, Mn2+ Doped TiO2 Nanopowders, Photocatalytic
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