光催化
煅烧
催化作用
动力学
过氧化氢
核化学
材料科学
化学
化学工程
有机化学
物理
量子力学
工程类
作者
Jian Sun,Xiaolei Wang,Jingyu Sun,Rong Sun,Sheng-Peng Sun,Liping Qiao
出处
期刊:Journal of Molecular Catalysis A-chemical
[Elsevier]
日期:2006-12-01
卷期号:260 (1-2): 241-246
被引量:201
标识
DOI:10.1016/j.molcata.2006.07.033
摘要
Sn(IV) doped and nano-sized TiO2 immobilized on active carbon (AC) (Sn(IV)/TiO2/AC) were prepared by the sol–gel and dip-calcination method. An azo dye, Orange G (OG), was used as a model compound to study its photocatalytic activity in a fluidized bed photoreactor. The addition of Sn(IV) on TiO2 could greatly improve the activity of TiO2, and the optimal amount of tin was 2.5 at.%. The effects of calcination temperature, pH value, the initial hydrogen peroxide concentration ([H2O2]0), the catalyst amount ([TiO2]), the initial OG concentration ([dye]0) and co-existing negative ions on the photocatalytic activity of Sn(IV)/TiO2/AC were studied. The optimal conditions were as follows: pH 2.00, [H2O2]0 = 1.5mL/L, [dye]0 = 50 mg/L, [TiO2] = 12.5 g/L, when the 300 W high pressure mercury light was used as the light source. Under these conditions, the degradation efficiency of OG reached 99.1% after 60 min reaction. The kinetics of the OG degradation was also analyzed. The results showed that the kinetics of this reaction fit the Langmiur–Hinshelwood kinetics model well and the absorption of OG on the Sn(IV)/TiO2/AC surface was the controlling step in the whole degradation process. In addition, the catalyst, liquid and gas were separated effectively, and the integrative process of reaction and separation was achieved during the experiment.
科研通智能强力驱动
Strongly Powered by AbleSci AI