焙烧条件对CaTiO3光催化性能的影响.pdfVIP

第15卷 第6期 材 料 科 学 与 工 艺 V0l_15 No．6 2 0 0 7年12月 MATERIALS SCIENCETECHNOL0GY Dec．，2007 焙烧条件对CaTiO3光催化性能的影响 王桂赘，王延吉，秦 娅，宋宝俊 (河北工业大学化工学院，天津300130，E-mail：wgy1964@hebut．edu．en) 摘 要：为了制得性能良好的CaTiO 催化剂，探讨了焙烧条件对CaTiO 光催化性能的影响．考察了以 Ca(NO )：和TiO(OH)：为原料，NaOH为矿化剂，固态反应合成CaTiO 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CaTiO 光催化活性的影响，并对不同焙烧条件制得的CaTiO 样品进行了XRD 和SEM分析．结果表明，CaTiO 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CaTiO 的活性；焙烧时间及焙烧温度因对固态反应的完全性和CaTiO 粒度的双重影响而 存在适宜值．适宜的焙烧条件制得的CaTiO 再负载0．2％(质量分数)的CoO后得到活性较高的光催化剂． 关键词：光催化；分解水；钛酸钙；焙烧 中图分类号：0643文献标识码：A 文章编号：1005—0299(2007)06—0831—04 The effect of calcination conditions on the photocatalytic performance of CaTiO3 WANG Gui—yun，WANG Yan-ji，QIN Ya，SONG Bao-jun (College of Chemical Engineering，Hebei University of Technology，Tianjin 300130，E-mail：wgy1964@hebut．edu．en) Abstract：To get CaTiO3 catalyst with high photocatalytic properties，the effect of calcination conditions，on the photocatalytic activity of CaTiO3 was investigated．The calcination conditions included heating rate of calcina- tion precursors，calcination temperature，calcination time and cooling rate of calcination products，The catalyst was synthesized by solid—state reaction method with Ca(NO3)2 and TiO(OH)2 as raw materials and NaOH as mineralizer．The physical properties of the catalyst were characterized using XRD and SEM．The experimental resuhs 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 ob— tained．As a result，the CaTiO3 catalysts with high photocatalytic