【摘要】 为了制得性能良好的CaTiO3催化剂,探讨了焙烧条件对CaTiO3光催化性能的影响.考察了以Ca(NO3)2和TiO(OH)2为原料,NaOH为矿化剂,固态反应合成CaTiO3时,焙烧前驱物升温速率、焙烧温度、焙烧时间及焙烧产物降温速率对CaTiO3光催化活性的影响,并对不同焙烧条件制得的CaTiO3样品进行了XRD和SEM分析.结果表明,CaTiO3的光催化活性随着焙烧前驱物升温速率的增大先升高,后降低;焙烧产物的快速降温将显著降低CaTiO3的活性;焙烧时间及焙烧温度因对固态反应的完全性和CaTiO3粒度的双重影响而存在适宜值.适宜的焙烧条件制得的CaTiO3再负载0.2%(质量分数)的CoO后得到活性较高的光催化剂.更多还原

【Abstract】 To get CaTiO3catalyst with high photocatalytic properties,the effect of calcination conditions,on the photocatalytic activity of CaTiO3 was investigated.The calcination conditions included heating rate of calcination precursors,calcination temperature,calcination time and cooling rate of calcination products,The catalyst was synthesized by solid-state reaction method with Ca(NO3)2and TiO(OH)2as raw materials and NaOH as mineralizer.The physical properties of the catalyst were characterized using XRD and SEM.The experimental results showed that the activity increased until reached a maximum,and then decreased with the increasing heating rate of calcination precursors;the photocatalytic activity decreased drastically with the fast cooling rate of calcination products.Moreover,the optimal values of calcination temperature and calcination time were obtained.As a result,the CaTiO3catalysts with high photocatalytic activity can be obtained under an optimized calcination conditions after loading CoO(0.2 wt%)co-catalyst.更多还原