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Journal of Nanoscience Letters 2012, 2: 19
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Research Article
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Silver loaded titania nanostructures with extended spectral response for enhanced solar photocatalysis
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Suprabha. T, Haizel G. Roy, Suresh Mathew
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School of Chemical Sciences, Mahatma Gandhi University, Kottayam 686 560, Kerala State, India
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Abstract |
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Nanotitania with three different morphologies viz., cubes, spheres and rods were synthesized by microwave irradiation. Nano-sized silver particles were loaded on nanotitania by metal sol method. As-synthesized TiO2 and Ag-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. Photocatalytic degradation of methylene blue by titania and silver loaded titania were investigated under sunlight. The dye degradation capabilities of nano-sized Ag-TiO2 catalysts were found superior to bare TiO2 nanostructures. The higher photoactivity of Ag-TiO2 can be ascribed to the effect of silver deposits acting as electron traps on the Ag-TiO2 surface. Dye degradation studies indicated that anatase titania with cubic morphology is preferable for silver loading for higher photocatalytic activity. Optical characterization by UV-visible spectrophotometer showed a shift in absorption wavelength to the visible region due to the incorporation of silver nanoparticles into titania nanostructures.
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Keywords |
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Nanosized silver; Ag-TiO2; Photocatalysis; Dye degradation; Metal sol method; Microwave irradiation
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