影像科学与光化学 ›› 2005, Vol. 23 ›› Issue (6): 460-466.DOI: 10.7517/j.issn.1674-0475.2005.06.460

• 应用与发展 • 上一篇    

TiO2薄膜光催化还原Hg2+的研究

杨莉, 吴光辉, 周韦, 时武龙   

  1. 南昌航空工业学院 环境与化学工程系, 江西南昌330034
  • 收稿日期:2005-03-28 修回日期:2005-06-29 出版日期:2005-11-23 发布日期:2005-11-23
  • 通讯作者: 杨莉,E-mail:yl_sea@yahoo.com.cn.
  • 基金资助:
    南昌航空工业学院科研基金项目(EC200402026)

Study on Photocatalytic Reduction Hg2+ by TiO2 Film

YANG Li, WU Guang-hui, ZHOU Wei, SHI Wu-long   

  1. Department of Enviroment and Chemistry Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330034, Jiangxi, P. R. China
  • Received:2005-03-28 Revised:2005-06-29 Online:2005-11-23 Published:2005-11-23

摘要: 采用溶胶法制备出TiO2、SO42-/TiO2、CdS/TiO2薄膜光催化剂,研究了TiO2薄膜光催化还原Hg2+的最佳实验条件以及SO42-/TiO2、CdS/TiO2薄膜与TiO2薄膜、TiO2粉体与薄膜之间的光催化活性差异.结果表明:当pH=5.34时,经30 min紫外光照射,Hg2+的还原率达到最大;Hg2+初始浓度越高,光致还原量越低;光源波长越短,Hg2+的还原率越高;当甲醇添加量达到15%(体积比)时,反应30 min后,Hg2+的还原率即达100%;CdS改性薄膜的光催化活性高于未改性薄膜;CdS/TiO2薄膜的光催化活性略高于粉体.

关键词: 溶胶法, SO42-/TiO2, CdS/TiO2, 甲醇, 光催化还原, 汞离子

Abstract: TiO2、SO42-/TiO2、CdS/TiO2 film photocatalysts were prepared by sol method.The optimum experimental conditions for photocatalytic reduction Hg2+ using TiO2 film and the photocatalytic activity comparision among SO42-/TiO2,CdS/TiO2,and TiO2 film,between TiO2 powder and film were investigated.The results were as follows: the best reduction efficiency of Hg2+ was obtained under UV irradiation for 30 min at pH=5.34,the photoreduced mass of Hg2+ was more lower with the Hg2+ initial concentration increasing,the reduction efficiency was promoted under shorter wavelength,the reduction efficiency reached 100% after 30 min at the additon of methanol=15%(v/v),the photocatalytic activity of CdS-modified film was higher than that of unmodified film,the photocatalytic activity of CdS/TiO2 film was better than that of powder.

Key words: sol method, SO42-/TiO2, CdS/TiO2, methanol, photocatalytic reduction, Hg2+

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