TiO_2薄膜光催化还原Hg^(2+)的研究  

Study on Photocatalytic Reduction Hg^(2+) by TiO_2 Film

作　　者：杨莉[1] 吴光辉[1] 周韦[1] 时武龙[1] 

机构地区：[1]南昌航空工业学院环境与化学工程系,江西南昌330034

出　　处：《感光科学与光化学》2005年第6期460-466,共7页Photographic Science and Photochemistry

基　　金：南昌航空工业学院科研基金项目(EC200402026)

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.TiO2,SO4^2- /TiO2,CdS/TiO2 film photocatalysts were prepared by sol method. The optimum experimental conditions for photocatalytic reduction Hg^2＋ using TiO2 film and the photocatalytic activity comparision among SO4^2-/TiO2 , CdS/TiO2 , and TiO2 film, between TiO2 powder and film were investigated. The results were as follows： the best reduction efficiency of Hg^2＋ was obtained under UV irradiation for 30 min at pH= 5.34, the photoreduced mass of Hg^2＋ was more lower with the Hg^2＋ 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.

关 键 词：溶胶法 SO4^2-/TIO2 CDS/TIO2 甲醇 光催化还原 汞离子 

分 类 号：O643.32[理学—物理化学]