Synthesizing and Evaluating the Photocatalytic and Antibacterial Ability of TiO2/SiO2 Nanocomposite for Silicate Coating

The TiO 2 /SiO 2 nanocomposite has been synthesized by a sol-gel method and investigated the effect of the SiO 2 content (0, 5, 10, 15, 20, and 50%) on the rutile-to-anatase phase transition of TiO 2 NPs. In order to increase the photocatalytic efficiency of the nanocomposite and decrease the price of material, the TiO 2 /SiO 2 Nc with content SiO 2 of 15% sample is chosen for preparing silicate coating. The efficiency of photocatalytic MB and antibacterial ability in the air of W silicate coating (adding TiO 2 /SiO 2 Nc (15%)) achieve almost 100% for 60 h and 94.35% for 3 h, respectively. While the efficiency of photocatalytic MB and antibacterial ability of WO silicate coating (adding commercial TiO 2 /SiO 2 ) is about 25–30% for 60 h and 6.02% for 3 h, respectively. The presence of TiO 2 /SiO 2 Nc (15%) with a larger surface area in W silicate coating can provide increased centers for absorption, photocatalytic reaction, and the contact between sample and bacteria lead to enhance the photocatalytic and antibacterial ability of W silicate coating.