高催化效率钒酸铋的合成及光催化性能

Synthesis of BiVO_4 with Highly Efficient Catalytic Activities and Its Photocatalytic Properties

采用低温一步法制备单斜相钒酸铋,通过控制反应温度实现了对晶体形貌的调控。通过光催化降解有机物罗丹明B及对样品进行X射线粉末衍射、紫外可见漫反射吸收光谱、扫描电镜的表征,研究了反应温度对钒酸铋可见光催化性能和形貌的影响。结果表明:反应温度为80℃条件下制备得到的BiVO_4样品呈现草捆状晶体结构,形貌规则,比其它温度条件制备得到的样品具有更多的表面活性位点,光催化效率最高,H_2O_2协同催化条件下光催化反应1 h对罗丹明B的降解率达到93. 56%。

Different morphologies of monoclinic BiVO 4 with enhanced visible-light photocatalytic activity were prepared with the control of the reaction temperature via the one-step route at low temperature.Photocatalytic decomposition of Rhodamine B was carried out and the samples were characterized by powder X-ray diffraction pattern,UV-Vis diffuse reflectance spectrum and scanning electron microscope.Furthermore,the effects of reaction temperature on the phtocatalytic properties and the morphologies of products were investigated.The results show that the better performance of photocatalytic decomposition for Rhodamine B was attained by the sample prepared at 80℃.The samples which possess straw bundle structure with regular morphology have more surface active sites than those prepared under other temperature conditions.With the cooperative catalytic effect of H 2O 2,93.56%of RhB has been degraded under the visible light irradiation for 1 h.