Au/CaTiO_3纳米复合材料的模拟太阳光光催化性能

Simulated Sunlight Photocatalytic Property of Au/CaTiO_3 Nanocomposites

采用聚丙烯酰胺凝胶法制备出CaTiO_3纳米颗粒,通过光还原法将Au纳米颗粒修饰在CaTiO_3表面,获得Au/CaTiO_3复合光催化剂.利用X射线粉末衍射技术（XRD）分析产物的物相,通过透射电子显微镜（TEM）观察样品的微观形貌,采用紫外—可见光分光光度计（UV-Vis）测试样品的漫反射光谱.在模拟太阳光的照射下,以罗丹明B（RhB）作为目标降解物,研究样品的光催化性能.结果表明：CaTiO_3颗粒表面沉积了粒径分布在6～13nm之间的Au纳米颗粒,在Au/CaTiO_3的漫反射光谱中发现了Au纳米颗粒表面等离子体共振吸收峰,Au纳米颗粒的修饰明显提升了CaTiO_3的模拟太阳光光催化活性.

CaTiO_3 nanoparticles were prepared via a polyacrylamide gel method.Au/CaTiO_3 nanocomposites were synthesized by using aphotocatalytic reduction route.The phase purity of the products was examined by means of X-ray powder diffraction（XRD）.The morphology of the samples was observed by a transmission electron microscope（TEM）.The UV-visible diffuse reflectance spectra of products were obtained via a UV-visible spectrophotometer.Rhodamine B（RhB）was chosen as the target pollutant to investigate the photocatalytic activity of the samples under the simulated sunlight irradiation.The results indicate that the Au nanoparticles（6~13nm）are assembled onto the surface of CaTiO_3,and the surface plasmon resonance（SPR）effect of Au nanoparticles is observed in the diffuse reflectance spectrum of Au/CaTiO_3 nanocomposite.Moreover,it is found that the simulated sunlight photocatalytic activity of CaTiO_3 can be enhanced by the decoration of Au nanoparticles.