催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (4): 377-382.

• 研究论文 • 上一篇    下一篇

LiF掺杂TiO2的制备及其光催化性能

江宏富,周作兴,刘杏芹,孟广耀   

  1. 中国科学技术大学材料科学与工程系, 安徽合肥 230026
  • 收稿日期:2007-04-25 出版日期:2007-04-25 发布日期:2011-03-28

Preparation of LiF-Doped TiO2 and Its Photocatalytic Performance for Degradation of Methylene Blue

JIANG Hongfu, ZHOU Zuoxing, LIU Xingqin, MENG Guangyao*   

  1. Department of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China
  • Received:2007-04-25 Online:2007-04-25 Published:2011-03-28

PDF

814

被引次数

39

摘要： 采用溶胶-凝胶法制备了LiF掺杂的TiO2光催化剂,并采用X射线衍射、 X射线光电子能谱和光致发光光谱等技术对样品进行了表征. 以亚甲基蓝的光催化降解为反应模型,考察了LiF掺杂量、退火温度和溶液pH值对催化剂光催化性能的影响. 结果表明, LiF的掺杂降低了金红石相的形成温度,同时在TiO2表面引入大量羟基氧并提高了TiO2表面氧空穴浓度,因此提高了TiO2的光催化性能. 在LiF掺杂量为8%, 退火温度为500 ℃和反应液pH值为6.6的条件下, LiF掺杂的TiO2的光催化活性是未掺杂TiO2的6倍.

关键词: 溶胶-凝胶法, 二氧化钛, 氟化锂, 掺杂, 亚甲基蓝, 光催化降解

Abstract: LiF-doped TiO2 catalysts were prepared by the sol-gel method and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and photoluminescence. The photocatalyst activity for the degradation of methylene blue was evaluated, and the effects of the LiF doping amount, annealing temperature, and pH value of the reaction liquid were investigated. LiF doping favored the formation of the rutile phase, introduced a large amount of hydroxyl, and increased the oxygen vacancy concentration on the surface of TiO2, which led to the high photocatalytic activity of LiF-doped TiO2. Under the conditions of 8% LiF doping, annealing temperature of 500 ℃, and reaction liquid pH value of 6.6, the photocatalytic activity of LiF-doped TiO2 was 5 times higher than that of undoped TiO2.

Key words: sol-gel method, titania, lithium fluoride, doping, methylene blue, photocatalytic degradation