The photocatalytic efficiency of nanocrystalline TiO 2 is strongly influenced by light sources and recombination of photoinduced electrons and holes. It is known that TiO 2 doped with Ag has self-sterilizing and self-cleaning effects. A study has been carried out on the photocatalytic behavior of silver modified titanium dioxide for decomposition of methyl orange after UV black lamps and solar irradiation treatment. The base nanoparticles were standard photocatalyst TiO 2 (P25). AgNO 3 aqueous solution with the presence of TiO 2 were irradiated with UV black lamps and reduced Ag doped the surface of the TiO 2 nanoparticles. The silver modified titanium dioxide particles were studied by XRD and TEM. Silver ions (Ag + ) were reduced to Ag 0 as shown by the XRD. Silver particles of about 10 nm in size were detected on the surface of the TiO 2 and partially in the aqueous solution. The presence of Ag 0 on the surface of TiO 2 nanoparticles, after UV black lamps and solar irradiation, highly increased the photocatyalytic activity in comparison to the photocatalyst P25. This is explained with the reduced recombination of electrons and holes in the presence of Ag 0 .
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