▎ 摘　　要

A continuous solvothermal approach is presented for fabricating ZnO-graphene hybrid nanoparticles with enhanced photocatalytic activity. The approach combines continuously delivering the graphene ethanol solution and the ZnO precursor ethanol solution simultaneously into the reactor. It takes only seconds to forming ZnO-graphene composites. The structure and morphology of the fabricated samples are characterized via X-ray diffraction, scanning electron microscopy, transmission electron microscope and scanning transmission electron microscope. Two types of the hybrid composites, a film-grain and a cobweb composite, are obtained at the different concentrations of the precursor while the temperature, the pressure and the resident time are 160 degrees C, 7 MPa, and 30 s, respectively. The synthesis mechanism is illustrated. The resultant hybrids exhibit excellent photocatalytical activity in degrading methyl orange dye in water. The degradation rate reaches almost 100% in 200 min. The degradation increases 30% compared with the bare ZnO. This enhanced photocatalytical performance of the ZnO-graphene hybrids attributes to the rapidly transfer of the photo-generated electrons from the surface of the catalyst to the graphene, preventing the photo-generated electron-hole pairs from the recombination. We believe that this continuous solvothermal approach can be a general way to prepare metal oxide-graphene composites with unique properties. (C) 2014 Elsevier B.V. All rights reserved.