模拟太阳光照射下Fe掺杂与Ag复合ZnO纳米材料的光催化性能研究

Photocatalytic properties of Fe doped and Ag composited ZnO nanomaterials under simulated sunlight

利用高分子网络凝胶法制备了Fe掺杂与Ag复合的ZnO纳米复合材料.采用X射线衍射(XRD)、扫描电子显微镜(SEM)和光电子能谱(XPS)研究分析了样品的微结构和形貌与成分变化,采用光致发光(PL)和紫外-可见吸收谱(UV-vis)对样品的光学性质进行表征.在模拟太阳光照射下,以亚甲基蓝为光催化反应模型化合物,考察了掺杂对光催化活性的影响.无论是单复合Ag还是Fe掺杂后再Ag复合,光催化性能都优于ZnO.特别是同时进行Fe掺杂与Ag复合的ZnO,其光催化性能显著提高.结合微结构表征和光学测试,对ZnO及掺杂ZnO的光催化机理进行了讨论.

Fe doped and Ag composited ZnO nanopowders were synthesized by polymer-network gel method.The microstructure, morphology and eompositional variation of the samples were analyzed by XRD,SEM and XPS.The optical properties of the samples were characterized by PL and UV-vis.Under the irradiation of simulated sunlight,methylene blue was used as a photocatalytic reaction model eompound to investigate the effect of doping on photocatalytic activity.Whether it was single eomposited by Ag or simultaneously Fe doped and Ag composited Zn0,their photoeatalytie performance became better than that of ZnO.In particular,ZnO,which was simultaneously doped with Fe and eomposited by Ag,exhibited a markedly improved photoeatalytie performance.The photoeatalytic mechanism was discussed in combination with microstruetures and optical properties of ZnO nanopartieles.