光敏化La_2O_3/TiO_2催化剂的制备及其光催化性能研究  

Study on Preparation and Photocatalytic Properties of Photosensitizatized La_2O_3/TiO_2 Photocatalyst

作　　者：徐志兵[1] 李晨君[1] 卢伍阳 

机构地区：[1]安庆师范学院资源环境学院,安庆246003

出　　处：《人工晶体学报》2015年第2期542-545,共4页Journal of Synthetic Crystals

基　　金：安徽省教育厅自然科学基金重点项目(KJ2011A200)

摘　　要：采用溶胶．凝胶法和水热法制备了La_2O_3／TiO_2复合物，将此种La_2O_3／TiO_2复合物利用叶绿素提取液浸泡后，制得了光敏化La_2O_3／TiO_2复合物，并采用透射电子显微镜、X-射线衍射仪、比表面积测定仪和紫外-可见分光光度计等对样品进行了表征。结果表明：La_2O_3／TiO_2催化剂的颗粒粒径在3～10nm之间，BET比表面积为173．53m^2／g，光敏化La_2O_3／TiO_2复合物具有较好的可见光响应性能。在可见光下研究了几种光催化剂对水中六价铬离子的光催化还原效果，光催化结果表明：以光敏化La_2O_3／TiO_2复合物为催化剂，在可见光下光催化还原含Cr^6＋废水180min后，Cr^6＋脱除率达到78．7％。The La203/TiO2 composite photocatalysts were prepared by hydrothermal and sol-gel methods. After La_2O_3/TiO_2 soaked in chlorophyll extract, the photosensitized La_2O_3/TiO_2 compound were prepared. The samples were characterized by TEM, XRD, BET specific surface area analyzer and UV-Vis spectra. The results show that the size of the La_2O_3/TiO_2 nanocrystals was about 3-10 nm, and BET specific surface area was 173.53 m^2/g. The photosensitized La_2O_3/TiO_2 compound had better photocatalytic activity with visible light response. Irradiations were performed with the visible light, the photocatalytic activity was studied with hexavalent chromium ions in water by the several photocatalysts. The efficiency of photocatalytic reduction of Cr^6＋ turned to 78. 7 % by photosensitizatized La_2O_3/TiO_2 as catalysts after photocatalytie reduction of the Cr^6＋ solution for 180 min.

关 键 词：光敏化 叶绿素 La_2O_3/TiO_2 

分 类 号：O643[理学—物理化学]