光催化
纳米晶材料
热重分析
拉曼光谱
光谱学
带隙
催化作用
材料科学
漫反射红外傅里叶变换
光化学
可见光谱
差热分析
红外光谱学
化学
无机化学
核化学
纳米技术
有机化学
衍射
光学
物理
量子力学
光电子学
作者
K. Nagaveni,M. S. Hegde,N. Ravishankar,G. N. Subbanna,Giridhar Madras
出处
期刊:Langmuir
[American Chemical Society]
日期:2004-02-19
卷期号:20 (7): 2900-2907
被引量:530
摘要
Nanocrystalline TiO2 was synthesized by the solution combustion method using titanyl nitrate and various fuels such as glycine, hexamethylenetetramine, and oxalyldihydrazide. These catalysts are active under visible light, have optical absorption wavelengths below 600 nm, and show superior photocatalytic activity for the degradation of methylene blue and phenol under UV and solar conditions compared to commercial TiO2, Degussa P-25. The higher photocatalytic activity is attributed to the structure of the catalyst. Various studies such as X-ray diffraction, Raman spectroscopy, Brunauer−Emmett−Teller surface area, thermogravimetric−differential thermal analysis, FT-IR spectroscopy, NMR, UV−vis spectroscopy, and surface acidity measurements were conducted. It was concluded that the primary factor for the enhanced activity of combustion-synthesized catalyst is a larger amount of surface hydroxyl groups and a lowered band gap. The lower band gap can be attributed to the carbon inclusion into the TiO2 giving TiO2-2xCx .
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