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Cobalt doped titania nanoparticles were synthesized by sol-gel method using titanium(IV) isopropoxide and cobalt nitrate as precursors. X-Ray diffraction (XRD) results showed that titania and Co/TiO 2 nanoparticles only include anatase phase. The framework substitution of Co in TiO 2 nanoparticles was established by XRD, scanning electron microscopy equipped with energy dispersive X-ray microanalysis (SEM-EDX) and Fourier transform infrared (FT-IR) techniques. Transmission electron microscopy (TEM) images confirmed the nanocrystalline nature of Co/TiO 2 . The increase of cobalt doping enhanced "red-shift" in the UV-Vis absorption spectra. The dopant suppresses the growth of TiO 2 grains, agglomerates them and shifts the band absorption of TiO 2 from ultraviolet (UV) to visible region. The photocatalytic activity of samples was tested for degradation of methyl orange (MO) solutions. Although the photocatalytic activity of undoped TiO 2 was found to be higher than that of Co/TiO 2 under UV irradiation, the presence of 0.5% Co dopant in TiO 2 resulted in a catalyst with the highest activity under visible irradiation.

Praseodymium oxide (Pr6O11) nanostructures were prepared via a new simple solvent-less route.