ZnO/BiOCl复合材料的制备及其可见光催化性能研究

Synthesis and visible light photocatalytic activity of ZnO/BiOCl composites

为提高BiOCl在可见光下的光催化性能,通过水解法合成了一系列复合ZnO的BiOCl样品,采用X射线粉末衍射仪、扫描电镜和紫外-可见分光光度仪对制得的催化剂的形貌、结构、物相组成以及光学性能进行了表征,通过降解罗丹明B对样品的光催化性能进行研究。结果表明,复合ZnO后可有效提高BiOCl的光催化活性,其中1Zn/20Bi的光催化活性最高,115 min内可见光降解罗丹明B的降解率达99%。通过研究机理发现,ZnO纳米异质结构不仅负责较高的可见光光催化活性,它在分离光产生的空穴和电子也起着至关重要的作用。

In order to improve the photocatalytic performance of BiOCl under visible light,a series of BiOCl samples with ZnO were synthesized by hydrolysis method.The morphology,structure,phase composition and optical properties of the prepared catalysts were characterized by XRD,SEM,UV-Vis diffuse reflectance spectroscopy and PL spectra.The photocatalytic properties of the samples were investigated by degrading Rhodamine B.The results show that the photocatalytic activity of BiOCl can be effectively improved by composite ZnO.The photocatalytic activity of 1Zn/20Bi is the highest,which the degradation rate of Rhodamine B in 115 min reach 99% under visible light.By studying the research mechanism,it is concluded that the ZnO nano-heterostructure is not only responsible for the high visible light photocatalytic activity,but also plays a vital role in separating the holes and electrons generated by light.