纳米复合Y_2O_3/TiO_2催化剂的光催化性能研究

采用溶胶-凝胶法制备复合半导体Y2O3/TiO2纳米材料.以酸性红B溶液的光催化降解反应为实验模型,考察了TiO2掺杂Y2O3后的光催化氧化活性,探讨了Y2O3掺杂量、pH值、焙烧温度及时间对Y2O3/TiO2复合氧化物催化剂光催化活性的影响及溶液浓度、光照时间、催化剂用量对酸性红B溶液降解率的影响.结果表明,Y2O3掺杂量为0.1%时,其催化活性是同样条件下催化剂TiO2的2.1倍;最适宜焙烧温度为400~450℃;焙烧时间为3h,凝胶pH=10时,催化效果最佳.在酸性红B溶液浓度为20mg/L的条件下,催化剂用量为0.15g,光照时间为2.5h对酸性红B溶液的降解率可达96.8%以上.

Stuty on preparation and photo-catalytic property of nano-Y2O3/ TiO2 composite

Y2O3/TiO2 samples were prepared by sol-gel process and charterized by mean of X-ray diffraction(XRD) and transmission electron mic-roscopy(TEM).Being a model reaction,the photo catalytic degradation of acidity red B solution was investigated in TiO2 and Y2O3/ TiO2 powder suspensions and irradiated by high pressure mercury lamp. Photo catalytic degradation efficiency of different catalysts were evaluated by the apparent first order kinetic constant and the decomposition rate of acidity red B. The effects of preparation conditions,the mass ratio and pH measurement of Y2O3/TiO2,calcinations conditions and special surface area on composite photo catalyst photo activity were also investigated. Results show that there exists a best ratio value betweenY2O3/ TiO2,while the mass ratio of composite catalyst is 0.1 to 100,the photo catalytic activity of Y2O3/TiO2 catalyst is 2.1 times as that of TiO2.