Ag-TiO_2复合纳米颗粒的自组装法制备及其光催化性

Fabrication of Ag-TiO_2 Composite Nanoparticles by Self-Assembly and Their Photocatalytic Activity

采用空气-水界面自组装法制备TiO2纳米粒子,将其放入AgNO3溶液中浸泡,后在较低温度下进行热处理(400℃),获得Ag-TiO2复合纳米颗粒。利用X射线衍射(XRD)仪、扫描电镜(SEM)、透射电镜(TEM)、紫外可见光谱(UV-Vis)等分析测试手段进行表征。结果表明:复合粒子可以显著提高TiO2颗粒光催化活性。以甲基橙为模拟污染物,经过光催化试验,证实复合纳米粒子具有较好的光催化活性,降解率达到96.25%。

Self-assembled TiO2-based air-water interracial particles with nano structure were soaked into silver nitrate （AgNO3） aqueous solution and Ag-TiO2 composite nanoparticles were obtained by the heat-treatment at 400 ℃. The composite nanoparticles were characterized by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and ultraviolet visible spectrum （UV-Vis）. The results show that the Ag-TiO2 particles at 400℃ could significantly enhance the photocatalytic activity of the TiO2 particles. Methyl orange was used as the degradable agent in photocatalytic experiment, The results indicate that methyl orange could be degraded 96.25% by Ag-TiO2 nanoparticles under the optimal conditions. It is concluded that the Ag-TiO2 composite nanoparticles posses good photocatalysis activity.