Doping and immobilization of TiO2 with element Na and raschig rings

Abstract Doping of TiO2 with element Na from NaCl and immobilization of TiO2 on raschig rings are carried out simultaneously by calcination at 500°C for 5 hours. XPS survey spectrum of the Na(0.1% mol)--TiO2 shows that the element Na can be penetrated into TiO2 lattice. The Na+ in the Na(0.1%)-TiO2 captures the photogenerated electron and Na+ is reduced to Na, the electron and the hole can be separated effectively, which causes Na(0.1%)-TiO2 to show stronger photocatalytic activity than pure TiO2. Repetitive photo-catalytic tests show that the Na(0.1% mol)--TiO2/RR is stable enough in water. Based on the XPS data analysis, we point out the presence of Ti3+ and Ti4+ and the conversion between them on the catalyst surface, the formation of Ti3+ is beneficial to the photocatalysis.