Iranian Nanotechnology Society International Journal of Nanoscience and Nanotechnology 1735-7004 4 1 2008 12 01 Photocatalytic degradation of E. coli bacteria using TiO2/SiO2 nanoparticles with photodeposited platinum 39 48 3998 EN Z. Ahmadi College of Chemistry, Iran University of Science and Technology, Narmak, Tehran, 16844, I. R. Iran Sh. Afshar College of Chemistry, Iran University of Science and Technology, Narmak, Tehran, 16844, I. R. Iran L. Vafaee College of Chemistry, Iran University of Science and Technology, Narmak, Tehran, 16844, I. R. Iran A. Salehi Agricultural Department, Saveh Azad University, Saveh, I. R. Iran Journal Article 2008 09 10 In this work, TiO2 /SiO2 (pure anatase), and TiO2 /SiO2 (anatase/rutile) nano-photocatalysts are prepared by using sol-gel method and control of acidity. The particles size is calculated using Scheerer, s equation and is estimated to be around 7-15 nm. In order to improve the photocatalytic activity of TiO2 /SiO2 ,1% (wt) platinum particles are loaded on both catalysts using photoreductive method. SEM images show that doping of Pt particles is not homogenous. FT-IR, BET and UV-Vis Reflectance are used to characterize the structures and properties of photocatalysts. The photocatalytic activities of these catalysts are investigated by their bactericidal activities on E. coli bacteria. 100% destruction of E. coli bacteria has occurred under UV light illumination after 5, 15, 20 and 60 min using Pt-TiO2 /SiO2 (pure anatase), TiO2 /SiO2 (pure anatase), Pt-TiO2 /SiO2 (anatase/rutile) and TiO2 /SiO2 (anatase/rutile) photocatalyst, respectively. The effect of doping Pt is remarkable and rate of destruction using Pt doped catalysts (both catalysts) is three times faster than that of TiO2 /SiO2 catalysts. https://www.ijnnonline.net/article_3998_74306eef5860833e2e47ff169a73b45b.pdf