Abstract:

Using titanium tetrachloride as Ti source and ammonium ceric nitrate as modified material,TiO₂ catalyst has been prepared by nonhydrolytic sol-gel process.The prepared sample is characterized by XRD,UV-Vis and SEM.The result reveals that adding ammonium ceric nitrate can restrain the growth of TiO₂ crystallites,strengthen the absorption of visible light and change its appearance and size.Its catalytic capacity is investigated by the degradation of phenol under visible light.The results show that when n(Ce)∶n(Ti)=0.3%,and the modified TiO₂ is calcined at 550 ℃,its catalytic activity is the best.After irradiated under visible light for 3 h,its phenol degradation rate is 93.1%.

Key words: photocatalysis, titanium tetrachloride, ammonium ceric nitrate, phenol

摘要：

以四氯化钛为钛源,硝酸铈铵为改性原料,采用非水体系溶胶-凝胶法制备了二氧化钛催化剂。采用XRD、UV-Vis和SEM等测试技术对样品进行了表征。结果显示:硝酸铈铵的添加抑制了TiO₂晶粒的生长,可使其对可见光吸收增强并且改变了其形貌及尺寸。以苯酚为模型,考察了样品的催化性能。结果表明,在n(Ce)∶n(Ti)为0.3%的条件下,于550℃下焙烧的TiO₂催化剂的催化活性最好。3 h光照后,苯酚降解率为93.1%。

关键词: 光催化, 四氯化钛, 硝酸铈铵, 苯酚

CLC Number: 

• X703