摘要
为获得高活性的负载型TiO2光催化剂,通过硝酸银溶液浸渍-紫外光照的方法获得载银的TiO2/沸石催化剂.银改性的TiO2/沸石催化剂光催化性能较改性前大大提高.最佳硝酸银浸渍液浓度为10-3mol/L,此时该催化剂的光催化性能接近纳米TiO2粉末(Degussa P25),但进一步升高硝酸银浸渍液浓度,光催化性能又降低.实验通过X射线衍射(XRD)和透射电镜(TEM)对载银TiO2/沸石催化剂的表征,结果表明,金属银对电子的捕获使得电子-空穴对有效分离,从而使银改性光催化剂的活性提高.
In order to obtain supported photocatalysts with high activity, silver-modified TiO2/zeohte catalysts were prepared by AgNO3 dipping followed by UV irradiation. The silver modified TiO2/zeolite catalysts showed more enhanced photocatalytic efficiency than non-silver modified TiO2/zeolite catalysts. The optimum silver nitrate concentration of the dipping solution was found to be 10^-3 mol L^-1 , whose photodegradation efficiency approached that of titanium dioxide powder （Degussa,P25）,but when the Ag^＋ concentrations increased further, the catalytic efficiency of the silver-modified catalysts decreased. Silver-modified catalysts were characterized by X-ray diffractometer （XRD） and transmission electron microscopy （TEM）. The results indicate that the presence of metallic silver always produces an increase in catalytic activity, possibly because of the increase in the electron-hole pair separation efficiency induced by trapping of electrons by metallic silver.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2005年第10期1623-1626,共4页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(90206007)
关键词
TiO2/沸石催化剂
银沉积
光催化降解
甲基橙
TiO2/zeolite catalyst
silver deposition
photocatalytic degradation
methyl orange
