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In this project, mesoporous titanium oxide-silicon oxide doped by silver (TiO₂-SiO₂-Ag) was hydrothermally synthesized. Titanium isopropoxide, tetraethyl orthosilicate and silver nitrate were used as precursors for TiO₂, SiO₂ and Ag, respectively. Initially TiO₂-SiO₂ mesoporous nanocomposite was synthesized with weight ratios of silica to titania SiO₂:TiO₂:3:1 via hydrothermal method at 70˚C and 130˚C, then 5wt% of silver was added to each sample. The samples were characterized using XRD, SEM, EDS, Map and BET analysis and photocatalytic performance of synthetic samples under visible light and ultra-violate were investigated using UV-Vis spectroscopy The results of isotherm adsorption-desorption of nitrogen indicate the mesoporous structure of TiO₂-SiO₂ samples. XRD analysis confirmed the presence of anatase and rutile phases in TiO₂-SiO₂ samples and also the presence of silver phase along with anatase and rutile in TiO₂-SiO₂-Ag composition. Examination of the photocatalytic activity of the specimens by visible and ultraviolet light showed that the highest degradation percentage of pollutant (33%) under visible-light and ultra-violate was observed for the sample with silica to titania ratio of 3 via hydrothermal method at 70˚C with additions of silver during synthesis (TS3A-70).

Keywords: titanium oxide, silicon oxide, silver, photocatalytic

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