改性非晶态TiO_2的制备及光催化性能研究

Preparation and photocatalytic property of modified amorphous TiO_2

采用溶胶-凝胶法制备改性非晶态TiO_2,利用XRD、SEM、FT-IR、低温N_2吸附、能谱及紫外可见漫反射光谱等测试手段对催化剂进行表征.XRD分析表明,改性TiO_2的形态为非晶态.电镜及能谱分析表明,改性非晶态TiO_2颗粒大小均匀,分散性良好,Ag^+已成功进行掺杂.改性非晶态TiO_2属于中孔材料,比表面积达188 m^2·g^(-1),并且光谱响应范围扩大,对400~800 nm波长范围的光均具有良好的吸收.以甲醛的降解考察改性非晶态TiO_2的光催化活性,结果表明,在最佳改性条件下,所合成的改性非晶态TiO_2在日光灯照射5 h后对甲醛的降解率达到74.9%,优于P25型商品化TiO_2对甲醛的降解效果.

The modified amorphous TiO 2 was prepared by the sol-gel method. The properties of the as-prepared samples were characterized by XRD, SEM, FT-IR, N2 sorption analysis,EDS analysis and UV-Vis diffuse reflectance spectroscopy. The XRD analysis showed that modified TiO 2 was amor-phous. The SEM and EDS analysis showed that the size of the modified amorphous TiO 2 particles was uniform and has good dispersion,and the Ag＋ was doped successfully. The modified amorphous TiO 2 belonged to the mesoporous materials, and the specific surface area was 188 m2·g^-1. The light response range of the modified TiO 2 was improved,which had good absorption of light in the range of 400 ？800 nm. The results showed that the degradation rate of formaldehyde by the modified TiO 2 was 74.9 % under fluorescent lamp for 5 hours under best modified conditions. The photocatalytic perform-ance of modified amorphous TiO 2was superior to ordinary commercial TiO2（P25）.