ZnFe2O4掺杂对TiO2光催化活性的影响。
Effect of ZnFe2O4 doping on the photocatalytic activity of TiO2.
作者信息
Liu Guo-guang, Zhang Xue-zhi, Xu Ya-jie, Niu Xin-shu, Zheng Li-qing, Ding Xue-jun
机构信息
The Key Laboratory of Environmental Science and Technology of High Education of Henan Province, College of Chemistry and Environmental Science, Henan Normal University, 453002 Xinxiang, China.
出版信息
Chemosphere. 2004 Jun;55(9):1287-91. doi: 10.1016/j.chemosphere.2004.01.035.
The photocatalytic oxidation of the organic pollutants with the TiO2 as photocatalyst has been widely studied in the world, and many achievements have been got. The degradation of pollutants is highly related with the photocatalytic activity of TiO2. It is demonstrated that doping ions or oxides to TiO2 is one way to enhance the photocatalytic activity of TiO2. In this paper, the ZnFe2O4-doped TiO2 nanoparticles were prepared from butyl titanate by a sol-gel method and characterized by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that when TiO2 was doped with ZnFe2O4, its particle size will decrease and its crystal structure will partly transform from anatase to rutile. The photocatalytic activity of the elaborated powders was studied following the degradation of Rhodamine B. The results showed that doping ZnFe2O4 to TiO2 will enhance the photocatalytic activity of TiO2 and that ZnFe2O4-doped TiO2 in the coexistence of anatase and rutile has higher efficiency for the degradation of Rhodamine B than that in the anatase phase alone. Also the different role of O2 in the direct photolysis and photocatalysis of Rhodamine B was discussed.
以TiO₂为光催化剂对有机污染物进行光催化氧化已在世界范围内得到广泛研究，并取得了许多成果。污染物的降解与TiO₂的光催化活性高度相关。结果表明，向TiO₂中掺杂离子或氧化物是提高TiO₂光催化活性的一种方法。本文采用溶胶-凝胶法由钛酸丁酯制备了ZnFe₂O₄掺杂的TiO₂纳米颗粒，并通过X射线衍射（XRD）和透射电子显微镜（TEM）对其进行了表征。结果表明，当TiO₂掺杂ZnFe₂O₄时，其粒径会减小，晶体结构会部分从锐钛矿转变为金红石。通过罗丹明B的降解研究了所制备粉末的光催化活性。结果表明，向TiO₂中掺杂ZnFe₂O₄会提高TiO₂的光催化活性，并且在锐钛矿和金红石共存的情况下，ZnFe₂O₄掺杂的TiO₂对罗丹明B的降解效率比仅在锐钛矿相时更高。此外，还讨论了O₂在罗丹明B的直接光解和光催化中的不同作用。
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