Preparation of Crystalline Sn-Doped TiO 2 and Its Application in Visible-Light Photocatalysis

Sn-doped TiO 2 nanoparticles were prepared by the vapor transport method of water molecules and characterized by XRD and XPS analyses. The TEM images indicated that as-prepared samples were highly dispersed nanoparticles with a small and uniform size below 20 nm, as it would effectively control the rate of hydrolysis of Ti 4+ by adjusting the flow speed of water vapor. Meanwhile, the photocatalytic properties of Sn-doped TiO 2 were tested, and the results showed that doping an appropriate amount of Tin would improve the photocatalytic activity of TiO 2 by enhancing the separation rate of photogenerated electrons and holes on the surface of TiO 2 . In addition, the calcination temperature and Tin content had an important influence on the photocatalytic activity of TiO 2 . When the mix ratio of Sn:Ti reached 1%, and the nano-Sn-TiO 2 sample was calcined at , it showed the best photocatalytic activity.