光催化
纳米晶材料
材料科学
微晶
拉曼光谱
热液循环
傅里叶变换红外光谱
X射线光电子能谱
介孔材料
结晶
吸附
核化学
钛酸酯
化学工程
透射电子显微镜
无机化学
化学
纳米技术
催化作用
有机化学
陶瓷
冶金
物理
工程类
光学
作者
Yuanyuan Wang,Yaorong Su
出处
期刊:Journal of Molecular Catalysis A-chemical
[Elsevier]
日期:2006-10-01
卷期号:258 (1-2): 104-112
被引量:202
标识
DOI:10.1016/j.molcata.2006.05.036
摘要
Highly photoactive nano-sized TiO2 powder photocatalyst was prepared by a hydrothermal method at 180 °C for 5 h using tetrabutyl titanate (TBOT) as the precursor. The pH values of the starting suspensions were adjusted from 1 to 11 using a 1.0 M HCl or 1.0 M NH3·H2O solution. The obtained TiO2 powders were characterized with X-ray diffraction (XRD), N2 adsorption–desorption measurement, transmission electron microscopy (TEM), X-ray photoelectron spectra, Fourier transform infrared (FTIR), Raman spectra and UV–vis spectrophotometry. The photocatalytic activity was evaluated by photocatalytic oxidation decomposition of acetone in air. The results showed that the pH values of the solutions obviously influenced the microstructures and photocatalytic activity of the as-prepared TiO2 powders. With increasing pH values, the crystallization enhanced, crystallite size increased and BET specific surface areas decreased. The photocatalytic activity of TiO2 powders prepared at a pH range of 6–9 exceeded that of Degussa P-25 by a factor of more than two times.
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