摘要：为研究ZnO/Al₂O₃复合纳米颗粒在涂料、化妆品等领域的应用,采用直接沉淀法制备了纳米ZnO,用硫酸铝水解生成的Al₂O₃对纳米ZnO进行了表面改性。采用IR、TEM、SEM、XRD等手段对改性前后的粉体进行表征。分析结果表明,改性后粉体颗粒的团聚现象减轻。粉体的光催化降解甲基橙的实验研究表明,改性后ZnO粉体的光催化活性明显下降,进一步证明纳米ZnO颗粒表面存在Al₂O₃的包覆层。

关键词：纳米颗粒；氧化锌；三氧化二铝；表面改性；光催化

Abstract：In order to study the ZnO/Al₂O₃ composite nanoparticles used in paintings and cosmetics,ZnO nanoparticles were prepared by homogeneous precipitation using ZnSO₄·7H₂O and NaOH,then they were coated with Al₂O₃ by the hydrolysis of Al₂(SO₄)₃. The prepared nanoparticles were characterized by IR,TEM,XRD and SEM.Comparing the SEM of ZnO and ZnO/Al₂O₃,it was found that the agglomeration of nanoparticles was greatly reduced. In addition, photodegradation of methyl orange in aqueous solution is performed using ZnO and ZnO/Al₂O₃ nanoparticles as photocatalysts. The results showed that the photocatalytic activity of ZnO/Al₂O₃ nanoparticles was reduced, which further illustrated that Al₂O₃ was coated on the surface of ZnO nanoparticles as a thin layer.

Keywords：nanoparticles;ZnO;Al₂O₃;surface modification;photocatalysis