水热法制备二氧化锡/钨酸铋复合光催化材料及其催化活性研究

本文用水热法制备了正交晶系的纳米球状结构的二氧化锡和正交晶系的由片状聚集成球状结构的钨酸铋,并且对二者进行了复合,制备出了二氧化锡/钨酸铋复合光催化材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、比表面积测试仪(BET)、紫外可见分光光度计等技术对复合样品的结构、形貌、比表面积、孔容孔径和光学性质进行了表征。用碘钨灯模拟太阳光,分别以二氧化锡、钨酸铋和二氧化锡/钨酸铋复合材料为催化剂降解罗丹明B(RhB),研究所制备的二氧化锡/钨酸铋复合材料的光催化活性。光催化90 min时二氧化锡、钨酸铋和二氧化锡/钨酸铋对罗丹明B的降解率分别是9%、22%和30%。实验结果表明,在可见光下,二氧化锡/钨酸铋复合材料的光催化活性要高于单一的二氧化锡和钨酸铋。

Preparation of Tin Dioxide/Bismuth Tungstate Composite Photocatalytic Materials by Hydrothermal Method and Its Catalytic Activity

In this paper, the orthorhombic nano-spherical tin dioxide and orthorhombic bismuth tungstate which are aggregated from flake to spherical structure were prepared by hydrothermal method, and then they were compounded to prepare the composite photocatalytic material of tin dioxide/bismuth tungstate. X-ray diffraction (XRD), scanning electron microscope (SEM), specific surface area tester (BET) and UV-Vis spectrophotometer were used to characterize the structure, morphology, specific surface area, pore volume and aperture and optical properties of the composite samples. The photocatalytic activity of tin dioxide/bismuth tungstate composites was studied by iodine tungsten lamp to simulate sunlight and using tin dioxide, bismuth tungstate and tin dioxide/bismuth tungstate composites as catalysts to degrade rhodamine B(RhB). The degradation rates of rhodamine B by tin dioxide, bismuth tungstate and tin dioxide/bismuth tungstate are 9%, 22% and 30%, respectively. Experiments show that the photocatalytic activity of tin dioxide/bismuth tungstate composite is higher than that of single tin dioxide and bismuth tungstate under visible light.