[Objective]To preparea composite photocatalyst of Cu_2O-QDs/GO and investigate the optimal loading amount of GO and its photocatalytic activity.[Method]The modified Hummer method and a chemical deposition process were used to prepare GO and the Cu_2O-QDs/GO composite. The morphology,composition and properties of the photocatalysts were characterized by TEM,XRD and DRS. [Result]The results showed that the prepared GO was in the form of monolayer,and the Cu_2 O was loaded on the GO surface with a particle siz...