摘要：以γ-Al₂O₃为载体,采用均相沉淀法制备不同ZnO负载量的纳米ZnO-γ-Al₂O₃复合粉体。通过X射线粉末衍射(XRD)、扫描电镜(SEM)和氮气吸附对复合粉体的结构、表面形貌和比表面积进行表征。以壬基酚聚氧乙烯醚(NPE-10)为模拟污染物,对复合粉体的光催化性能进行评价。结果表明:ZnO成功负载到了γ-Al₂O₃表面,且负载量随着ZnO比例的增加而增加,当ZnO与γ-Al₂O₃质量比为2:1时,ZnO在γ-Al₂O₃表面形成均匀的薄膜,且这时的复合粉体催化性能最好。煅烧温度、复合物用量对其光催化性能有显著影响,300℃下煅烧所得的复合粉体,当添加量为0.3 g时,在紫外光下照射4 h后降解率可达到96%以上,重复使用6次后降解率仍可达90%以上。

关键词： 纳米复合材料；负载；光催化

Abstract：The different ZnO loadings ZnO -γ-Al₂O₃ composite nano-particles were prepared by homogeneous precipitation method when the γ-Al₂O₃ was employed as supports. The structure， surface information and specific surface area of the composite nano-particles were characterized by X-ray diffraction （XRD）， scanning electron microscopy （SEM） and N₂ adsorption. The photocatalytic performance of the composite nano-particles were appraised using nonylphenyl poly（oxyethylene）ether（NPE10） as the model pollutants. The results indicated that ZnO was successfully loaded on the surface of γ-Al₂O₃ and the loading increased with the increase of ZnO content. ZnO thin films were uniformly immobilized on the surface of γ-Al₂O₃ and the composite nano-particles had the best photocatalytic performance when the mass ratio of ZnO and γ-Al₂O₃ was 2 ∶ 1. The influence of calcination temperature， dosage of the composite nano-particles on the photocatalytic performance were investigated. When the dosage of the composite nano-particles which was calcined at 300 ℃ was 0.3 g， it was found that the degradation rate reached more than 96% when it was irradiated by the ultraviolet light for 4 h and more than 90% when it was reused six times. 

Keywords： nano-composites； loading； photocatalysis