负载型Ca掺杂TiO_2材料的制备及其光催化性能

Preparation of immobilized Ca-doped titanium dioxide material and their photocatalytic performance

选用表面多孔的陶瓷颗粒为载体,采用水热合成法制备了负载型Ca掺杂TiO2光催化材料,以样品对水中罗丹明B的降解性能为评价指标,对样品的光催化性能进行评价。光催化降解体系中罗丹明B的质量浓度相对于负载型Ca掺杂TiO2光催化材料上的催化活性中心浓度很高,反应物分子在催化剂表面吸附达饱和状态,反应速度完全由催化剂表面的电子和空穴的数量决定,样品对水中罗丹明B的光催化降解反应严格符合零级动力学规律。煅烧使Ca掺入TiO2晶体,引起晶格膨胀,掺杂Ca的样品在500℃煅烧0.5 h后光催化性能提高2倍以上。

The immobilized Ca-doped titanium dioxide photocatalytic materials are prepared by hydrothermal method on the face of porous ceramic grain. The photocatalytic performance of product is estimated by the degradation of rhodamine B in the solution. The concentration of the activated center on the product is higher than the concentration of rhodamine B in the solution. Since the adsorption of reactant molecule on the immobilized Ca-doped titanium dioxide photocatalytic materials is at saturation, the reactivity rate is decided by the number of electrons and cavities on the face of the catalyzer. The photo-degradation of product accords with naught-kinetics. The calcium can be mixed into titanium dioxide crystal by firing. The crystal lattice is expanded then the photocatalytic performance of the product is doubled which is fired at 500℃ for 0.5 hour.