Controlled Synthesis of Pt doped Nanotitania as Visible Light Responsive

Nanotitania with three different morphologies viz., cubes, spheres and rods were synthesized by microwave irradiation. Nano-sized platinum particles were doped on nanotitania by metal sol method under controlled conditions. Photocatalytic degradation of methylene blue over bare and platinum doped titania was conducted under sunlight to investigate the effect of Pt on the dye degradation property of nanotitania Assynthesized TiO2 and Pt-TiO2 nanostructures were characterized by X-ray diffraction (XRD), UV-visible spectroscopy, Raman spectroscopy, BET surface area, Photoluminescence (PL), Field emission scanning electron microscopy (FESEM) with EDX, Transmission electron microscopy (TEM) and Atomic force microscopy (AFM) techniques.. The dye degradation capabilities of nano-sized Pt-TiO2 catalysts were found superior to bare TiO2 nanostructures. The higher photoactivity of Pt-TiO2 can be ascribed to the effect of platinum deposits acting as electron traps on the Pt-TiO2 surface. Optical characterization by UV-visible spectrophotometer showed a shift in absorption wavelength to the visible region due to the incorporation of platinum nanoparticles into nanotitania.

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