中山大学学报自然科学版 ›› 2011, Vol. 50 ›› Issue (1): 85-88.

• 研究论文 • 上一篇    下一篇

La-CdS/TiO2光催化剂的制备及表征

高洪涛1,2,刘园园2
  

  1. (1.济宁学院化学与化工系,山东 曲阜 273155;2.青岛科技大学生态化工教育部重点实验室,山东 青岛 266042)
  • 收稿日期:2010-08-03 修回日期:1900-01-01 出版日期:2011-01-25 发布日期:2011-01-25

Preparation and Characterization of La-CdS/TiO2 Photocatalyst

GAO Hongtao 1,2, LIU Yuanyuan2   

  1. (1. Department of Chemistry and Chemical Engineering, Jining University, Qufu 273155, China;2. Key Laboratory of Ecochemical Engineering, Ministry of Education, Qingdao University of Science & Technology, Qingdao 266042,China)
  • Received:2010-08-03 Revised:1900-01-01 Online:2011-01-25 Published:2011-01-25

摘要: 采用金属掺杂和半导体复合两种方法结合制备La3+掺杂、CdS复合TiO2光催化剂。通过SEM、XRD和UV-DRS等对样品形貌、结构及光吸收性能进行了表征,并以甲基橙溶液为目标降解物考察了改性TiO2的光催化性能。结果表明,La-CdS/TiO2光催化剂在可见光区的吸收能力显著提高,光吸收发生明显红移,吸收边波长为452 nm;La3+掺杂降低了光生电子-空穴对的复合率,CdS复合扩展了光谱响应范围,光催化活性明显提高,光照15 min后,La-CdS/TiO2对甲基橙的降解率高达99%。

关键词: 镧掺杂, CdS, 二氧化钛, 光催化活性

Abstract: The La-CdS/TiO2 photocatalysts were prepared using hydrothermal method by metal doping coupled with semiconductor composite method. The products were characterized by SEM, XRD and UVvisible DRS, respectively. The photocatalytic performances of samples were studied on the degradation of methyl orange (MO). It was found that the absorption of La-CdS/TiO2 enhanced significantly, both in ultraviolet and visible light region. And the absorption edge was 452 nm, which shifted to the low energies (visible light region). Compared to bare TiO2, La doping reduced combination rates of the electronhole pairs and the coupled of CdS improved the response of TiO2 to visible light, which resulted in the optical response enhancement. After being irradiated for 15 minutes, the degradation rate on MO for the La-CdS/TiO2 catalyst almost reached 99%.

Key words: La3+ doping, CdS, TiO2, photocatalytic activity

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