三种改性方法对纳米ZnO催化剂粉体的光催化性能的影响

Influence of Three Modified Methods on the Photocatalytic Properties of ZnO Nanopowder

以SnCl4.5H2O、ZnNO3.6H2O、HCl、NaOH、FeCl3.6H2O为原料,采用共沉淀法制备Fe掺杂纳米ZnO、纳米ZnO/SnO2和Fe掺杂纳米ZnO/SnO2三种复合催化剂粉体,以降解甲基橙溶液反应为模型,研究了不同比例的ZnO/SnO2复合、Fe元素掺杂量以及SnO2复合Fe元素掺杂同时作用对纳米ZnO粉体光催化活性的影响,采用X射线衍射(XRD)测试方法对不同量Fe元素掺杂纳米ZnO粉体进行了表征。采用透射电镜对三种改性方法ZnO粉体进行表征。结果表明:随着ZnO/SnO2的物质的量比增加,ZnO/SnO2复合光催化剂的催化活性先增加,然后降低;随着Fe掺杂量的增加,纳米ZnO粉体的光催化活性先增加,然后降低。三种改性方法都能提高纳米ZnO粉体的光催化活性,其中Fe元素掺杂以及SnO2复合改性纳米ZnO粉体的光催化效果最好,物相为ZnO和SnO2,颗粒尺寸为15～20 nm,分散性好,比表面积为68.7 m2/g。

ZnO nanopowder doped with various amount Fe,nanometer ZnO/SnO2 powder and ZnO/SnO2 nanopowder doped with Fe were prepared by coprecipitation method with SnCl4·5H2O,ZnNO3·6H2O,HCl,NaOH,FeCl3·6H2O as raw materials.Influence of ZnO nanopowder doped with different content of Fe,different proportion of ZnO/SnO2 compound and ZnO/SnO2 nanopowder doped with Fe on the photocatalytic properties of ZnO nanopowder were studied by the degradation of methyl orange solution as a reaction model.ZnO nanopowder doped with different content of Fe was characterized by XRD.Nanometer ZnO powder was characterized by TEM.The results show that the photoactivating activity of ZnO nanopowder first increases and then decreases when Fe doping content increasing or the ratio of ZnO/SnO2 increasing,the photocatalysis activity of ZnO nanopowder increased significantly when modified by three kinds of modified methods,and the photocatalytic activity of Fe doped compounding modification nanometer ZnO/SnO2 is the best,the phase is ZnO and SnO2,the particle size is 15-20 nm,the dispersion of powder is better,specific surface area is 68.7 m2/g.