Study On The Preparation Modification And Load Of S-TiO₂ Photocatalyst

In this study,Pure titania, S-doped TiO₂,La-doped TiO₂ and co-doped with La and S were prepared by sol-gel method. The catalysts obtained were characterized by XRD, DRS and FTIR. And activated carbon fibers (ACFs) as the support for S-doped TiO₂ loading, S-doped TiO₂ were loaded ACF (S-TiO₂/ACF)samples were prepared by sol-gel method and coupling method. The methyl orange in water were chosen as the model to evaluate the photocatalytic activity of all samples.The S single-doping could restrain the increase of catalyst particle and refine particle. Besides, adding S could led to distortion, it could also broad light absorption range of TiO₂ and decrease band gap, which could improve the photocatalytic ability. It was found that the samples calcined at 500℃and S doped with 10% (in mole) possessed the highest photocatalytic activity among of all the prepared samples under UV-light irradiation, and calcined at 600℃, S doped with 5% (in mole) under Visible-light irradiation.The optimal doping amount (in molar ratio) was La:N:TiO₂ =0.1%:10%:1 in La/S co-dopedTiO₂. The optimal temperature of heat treatment for La-N co-doped TiO₂ was 600℃. The photocatalysis properties of co-doped TiO₂ prepared under this condition can be enhanced largely than N-doped TiO₂,La-doped TiO₂ and pure TiO₂ . The result of DRS showed that La/S co-doped enhanced light absorption in ultraviolet light region and visible light region.In immobilization system, catalysts which were prepared by coupling method could recycled many times,because of epoxy resin's bonding effection. Methyl orange in water could be degraded fleetly because of the dual function of adsorption and photocatalysis. In recycling, it was gradually formed dynamic balance of pollutants molecular adsorption, potocatalytic degradation and small molecules desorption.