以十二烷基苯磺酸钠为模型反应物的Y_2O_3/TiO_2复合催化剂的制备及光降解催化性能

PREPARATION AND PHOTOCATALYTIC PERFORMANCE OF Y_2O_3/TiO_2 CONDUCTED WITH THE DEGRADATION OF SODIUM DODECYLBENZENE SULPHONATE

采用浸渍法制备了Y2 O3/TiO2 复合氧化物催化剂 ,并用紫外可见光谱、SEM、BET等手段对其进行了表征 .以水相十二烷基苯磺酸钠 (DBS)溶液的光催化降解反应为实验模型 ,考察了TiO2 掺杂Y2 O3后的光催化氧化活性 ,并探讨了Y2 O3掺杂量、吸附性、焙烧温度及时间对Y2 O3/TiO2 复合氧化物催化剂光催化活性的影响 .实验结果表明 :复合氧化物催化剂Y2 O3/TiO2 存在某一最佳组分比值 ,当两者重量比为 1∶2 0 0时 ,其催化活性是同样条件下前体催化剂TiO2 的 2

Y 2O 3/TiO 2 catalysts were prepared by impregnation method and characterized by means of UV,SEM,and BET.Being a model reaction,the photocatalytic degradation of DBS solution was investigated in TiO 2 and Y 2O 3/TiO 2 powder suspensions and irradiated by high pressure mercury lamp.Photocatalytic degradation efficiency of different catalysts were evaluated by the apparent first-order kinetic constant and the decomposition rate of DBS.The effects of preparation conditions,the mass ratio and adsorption of Y 2O 3/TiO 2 ,calcination conditions and special surface area on composite photocatalyst photoactivity were also investigated.Results show that there exists a best ratio value between Y 2O 3 and TiO 2,while the mass ratio of composite catalyst is 1 to 200,the photocatalytic activity of Y 2O 3/TiO 2 catalyst is 2.4 times as that of TiO 2.