Girginov C.Stefchev P.Vitanov P.Dikov H.2024-07-102024-07-102024-07-102024-07-102012-01-011791-23771791-932010.25103/jestr.054.03SCOPUS_ID:84873973457https://rlib.uctm.edu/handle/123456789/268The photocatalytic efficiency of nanocrystalline TiO2 is strongly influenced by light sources and recombination of photoinduced electrons and holes. It is known that TiO2 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 TiO2 (P25). AgNO3 aqueous solution with the presence of TiO2 were irradiated with UV black lamps and reduced Ag doped the surface of the TiO2 nanoparticles. The silver modified titanium dioxide particles were studied by XRD and TEM. Silver ions (Ag+) were reduced to Ag0 as shown by the XRD. Silver particles of about 10 nm in size were detected on the surface of the TiO2 and partially in the aqueous solution. The presence of Ag0 on the surface of TiO2 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 Ag0. © 2012 Kavala Institute of Technology.enArticle