This study has continuely proceeded on photocatalytic application with TiO2 doping commercial La3+. To recycle rare earth metals (REMs) from used fluorescent powder and enhance the visible response of TiO2, La-doped TiO2 (La-TO) photocatalysis with visible-light-driven capacity for NO Removal was successfully synthesized via a facile sol-gel method followed by calcination. In the second year, to boost the immobilization of a photocatalyst on a proper support for further practical environmental application, La-doped TiO2 photocatalyst was firstly immobilized on a commercial ceramic filter with porous structure and high surface area. Immobilized La-doped TiO2 (La-TiO2) was applied for photocatalytic degradation of Acetone and NO at the ppb level under visible light region. It was found that 0.5wt% La doping into TiO2 exhibited an excellent photocatalytic performance. The photocatalytic removal efficiency of acetone and NO under visible light could reach up to 36.9% and 77.2% respectively, which were much higher than that of pure TiO2 (23.5% and 76.5%, respectively). Moreover, the resulting samples were characterized by various physicochemical characterization techniques including XRD, XPS, UV-vis DRS and EDS. The results show that La-TiO2 sol-gel could be uniformly immobilized on the ceramic filter by impregnation method and followed by a low-temperature calcination treatment process. The three-dimensional porous structure of ceramic air filter resulted in more adsorption sites and reaction contact between pollution gas and photocatalyst surface, which is superior to the powdered TiO2 catalyst on substrates or thin film deposited on glasses. In order to the further application, the effect of relative humidity on photocatalytic performance was discussed. The work will provide a new perspective for promoting large-scale environmental application of immobilized photocatalysts.

Photocatalysis、 Phosphors powder、La-TiO2