摘要
研究了由偏钛酸在不同温度下焙烧制成的 Ti O2 ,经氢还原后用于光催化降解磺基水杨酸 (SSal)以及Ti O2 的漫反射光谱和荧光光谱特征 .结果表明 ,锐钛型 Ti O2 在经 5 5 0℃氢还原处理 12 0 min后 ,光催化活性明显提高 ;6 0 0℃条件下焙烧制得的 Ti O2 ,经氢还原后其光催化降解 SSal的反应活性最高 .漫反射光谱结果表明 ,80 0℃条件下焙烧制得的 Ti O2 ,开始出现转晶现象 ,从锐钛型逐渐向金红石型过渡 . Ti O2 荧光光谱的荧光峰面积(F )和倍频峰面积 (R)的比值越大 ,Ti O2 光催化降解 SSal的活性越高 .提出了氢还原后 Ti O2
The photocatalytic degradation of sulfosalicylic acid (SSal) on TiO 2 prepared from H 2TiO 3 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 TiO 2 to degrade SSal is improved after hydrogen reduction. It is found that the TiO 2 prepared from H 2TiO 3 at 600 ℃ and then reduced in hydrogen atmosphere for 120 min is more active in photocatalytic degradation of SSal than the TiO 2 prepared at other temperatures. It is suggested that the transition from anatase to rutile TiO 2 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.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2001年第1期47-50,共4页
Journal of Molecular Catalysis(China)
基金
中国科学院重大项目! (KJ95 1-A1-5 0 5 )
中国国家博士后基金资助项目
关键词
光催化
二氧化钛
磺基水杨酸
氢还原
光催化剂
Photocatalysis
Titanium dioxide
Sulfosalicylic acid
Hydrogen reduction
