Abstract
Nanocrystalline titania and metal ion doped titania systems were prepared by combustion method. Titania exhibited bicrystalline phase consisting of both anatase and rutile. The bicrystalline framework in TiO2 powders can be conveniently altered by the incorporation of various bivalent/trivalent/tetravalent metal ions like Sn2+, Cu2+, La3+and Ce4+. The microstructure development and the influence of small amount of dopants on the resulting structural change have been investigated. p-XRD results confirms the stabilization of anatase phase in the case of Cu2+ and Sn2+ doped titania, while the polymorphic interfaces were retained in La3+and Ce4+ doped titania samples. The efficacy of the modified titania was studied on the degradation of Congo Red dye by harvesting solar light. Sn2+/TiO2 shows almost same photodegradation ability as that of pristine TiO2. Subsistence of catalytic hot spots at the interface of anatase-rutile and the synergistic effect of polymorphic phases explains the enhanced activity of La3+/TiO2 and Ce4+/TiO2. But the activity of Cu2+/TiO2 was found to be less due to high electron-hole recombination rate.
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