近年来，环境污染问题越来越受到人们的关注和重视。光催化技术可在太阳光照射条件下将大多数有机污染物降解为无毒的CO2、H2O和其他小分子。在众多可用于光催化反应的化合物中，ZnO因其催化活性高、安全无毒、使用寿命长等优点被广泛研究。然而，ZnO的催化效率受到以下三个因素的制约：一是ZnO(Eg=3.3eV)的宽禁带使得其只能被紫外光激发，影响了对太阳光的利用率；二是ZnO半导体表面的光生电子和空穴对极易复合，从而大大降低了催化剂的光催化效率；三是由于粉末状催化剂在光催化过程中难以分离和回收。为了提高ZnO的光催化活性和稳定性，本项目拟通过对ZnO纳米粒子的尺度和形貌调控改性，生成ZnO/石墨烯复合纳米材料，研究ZnO/石墨烯多因素协同作用的光催化机理等来克服上述困难。

In recent years, environmental pollution becomes more and more serious all over the world, environmental issue has attracted considerable attention by researchers. Photocatalytic technology has emerged as one of the most promising technologies in energy and environment area, it represents an easy way to utilize the inexhaustible solar energy to eliminate the most organic matter to non-toxic CO2, H2O and other small molecule. Among those photocatalysts, ZnO is widely studied due to its high catalytic activity, security, non-toxic, long life and other advantages. Unfortunately, ZnO (Eg=3.3eV) has low utilization of the total solar energy impinging on the surface of the earth due to its wide bandgap. In addition, the recombination of photo-electrons and holes on the surface of ZnO semiconductor are greatly reduced the photocatalytic activity of the catalyst. Thirdly, the powder catalyst is hard to separation and recovery in the process of photocatalysis. In this project, we attempt to overcome the above problems and improve the photocatalytic activity and stability of ZnO through modifying the structure and morphology of ZnO nanoparticles, synthesizing the ZnO/grapheme composites, and studying on multi-factor synergism photocatalytic mechanism of ZnO/graphene.