Ag纳米颗粒修饰对La掺杂ZnO纳米棒光催化性能的影响

The effect of Ag nanoparticles modification on photocatalytic properties of La-doped ZnO nanorods

采用水热法和光沉积制备Ag纳米颗粒修饰的La掺杂ZnO纳米棒,并通过光催化降解甲基橙(MO)溶液,考查了La掺杂浓度和Ag修饰对ZnO纳米棒光催化性能的影响.结果表明:La掺杂和Ag修饰能够提高ZnO纳米棒的光催化性能.La掺杂改变了ZnO纳米棒的结晶质量,La—O键的形成使ZnO晶体的本征吸收边红移且吸收强度增加,同时,La掺杂可提高ZnO电子浓度和形成杂质能级,Ag纳米颗粒的修饰提高了La掺杂ZnO光生电子与空穴对的分离效率,增加了载流子的寿命.与纯ZnO纳米棒相比,La掺杂和Ag修饰的ZnO纳米棒表现出良好的光催化性能.

Ag nanoparticles decorated by La-doped ZnO nanorods were prepared in this study by hydrothermal method followed by a photo-deposition process.Effects of La-doping content and Ag modification on the photocatalytic performance of ZnO nanorods were investigated by photocatalytic degradation of methyl orange(MO)solution.The experiment results show that the photocatalytic performance of ZnO nanorods is much enhanced by La-doping and the decoration of Ag nanoparticles.La-doping changes the crystal quality,and the formed La—O bond makes the intrinsic absorption edge red-shift and increases the absorption intensity.Simultaneously,La-doping improves the electron concentration and impurity level of ZnO crystal.The decoration of Ag nanoparticles on the surface of La-doped ZnO nanorods inhibits the recombination of photo-generated electrons and holes,and the exciton life is thereby prolonged.Ag decorated La-doped ZnO nanorods show more effective photocatalytic performance than that of pure ZnO nanorods.