Preparation and Photocatalytic Activity of Neutral La-TiO₂ Sol

Neutral TiO₂ sol is prepared with H₂TiO₃ as raw material through hydrolysis,growth of crystal lattice and crystallization in low temperature.The sol is characterized by XRD,SEM,TEM,absorption spectrometry and so on.The results show that the diameter of La-TiO₂ is about 11.6 nm and the absorption edges of La-TiO₂ sol shifts to 545 nm.The La-TiO₂ sol has good photocatalytic activity for formaldehyde since wet-electron states come into form at interfaces of nanometer TiO₂ and H₂O molecules layer,however this photocatalytic performance is deeply affected by environmental humidity.