Semiconductor photocatalysts are energy-saving, environmental-friendly and efficient, which have great potential in solving environmental pollution. In this paper, ZnO/CuO microspheres are modified by Graphene Oxide (GO) through in-situ and two-step methods, respectively. The effects of graphene oxide content and preparation method on the morphology, structure and photocatalytic properties of heterostructure microspheres are investigated. The results show that ZnO/CuO/GO (ZCGO) microspheres with uniform size and high catalytic activity can be o...