氢还原二氧化钛光催化降解磺基水杨酸的研究

研究了由偏钛酸在不同温度下焙烧制成的TiO2，经氢还原后用于光催化降解磺基水杨酸（SSal) 以及TiO2的漫反射光谱和荧光光谱特征。结果表明，锐钛型TiO2在经550℃ 氢还原处理120min后，光催化活性明显提高；600℃条件下焙烧制得的TiO2，经氢还原后其光催化降解SS al的反应活性最高。漫反射光谱结果表明，800℃条件下焙烧制得的TiO2，开始出现转晶现象，从锐钛型逐渐向金红石型过渡。TiO2荧光光谱的峰面积（F）和倍频峰面积（R）的比值越大。TiO2光催化降解SSal的活性越高，提出了氢还原后TiO2的光催化作用机制。

Study of Photocatalytic Degradation of Sulfosalicylic Acid on Titanium Dioxided Reduce by Hydrogen

The photocatalytic degradation of sulfosalicylic acid (SSal) on TiO2 prepared from H2TiO3 and reduced by hydrogen was investigated. The relationship between their DRS (diffuse reflection spectroscopy ) and FS (fluorescence spectroscopy) characteristics, and the first order constants of the degradation reactions have been studied. The results show that the photocatalytic activity of TiO2 to degrade SSal is improved after hydrogen reduction. It is found that the TiO2 prepared from H2TiO3 at 600 ℃ and then reduced in hydrogen atmosphere for 120 min is more active in photocatalytic degradation of SSal than the TiO2 prepared at other temperatures. It is suggested that the transition from anatase to rutile TiO2 happens when the preparation temperature is up to 800 ℃. The results of FS indicate that, the larger of the area ratio between the fluorescence peak (F) and the second harmonic generation peak (R), the larger the first order constants of the photocatalytic reactions of SSal.