不同形貌纳米ZnO的合成及其光催化性能研究

Preparation and photocatalytic degradation properties of ZnO nanopowers with different morphologies

以Zn(NO3)2·6H2O和NH4HCO3为原料,采用直接沉淀法制备了不同形貌和微观结构的纳米氧化锌。详细研究了反应终点pH值及沉淀前驱物的后处理方式等对粉体的晶体结构、形貌、粒径分布和团聚状况的影响。通过调节反应条件可分别获得网络状或颗粒状纳米氧化锌;光催化降解实验结果表明,网络状纳米氧化锌的光催化性能优于纳米颗粒状产物,而且该网络状和颗粒状纳米氧化锌的光催化活性均明显优于商品光催化剂P25。

ZnO nanopowers with different morphologies were prepared by using Zn（NO3）2·6H2O and NH4HCO3 as raw materials through a direct precipitation method.The effects of reaction terminal pH values and post-treatment of precipitation on the crystal phase,morphology,particle size distribution and aggregation of the obtained ZnO nanopowers were investigated in detail.The results show that the network-like and granular ZnO nanoparticles can be controllably prepared by adjusting the reaction conditions especially the terminal pH values.Moreover,the samples were utilized for the photodegradation of Rhodamine B in an aqueous suspension.The obtained network-like ZnO nanoparticles show excellent photocatalytic activity in comparison with the granular ZnO nanoparticles,and the photocatalytic activities of the network-like and granular ZnO nanoparticles are obviously better than that of the commercial photocatalyst P25.