▎ 摘　　要

A type of graphene oxide-based nanocomposite ((Fe3O4-ZnO QDs)@SiO2-GO nanocomposite) was synthesized via an amidation process by introducing mesoporous Fe3O4 nanoparticles and ZnO quantum dots onto the surface of GO. The structure characterization, optical properties, and magnetic properties of such nanocomposites were systematically studied by FT-IR and PL emission spectroscopy as well as AFM, VSM, TEM and SEM examination. The results show that the graphene oxide-based nanocomposite has high surface area, superparamagnetic properties and tunable fluorescence. Additionally, methylene blue was chosen as a model substance to investigate the loading capacity of this nanocomposite. The loading experiments indicate that such a nanocomposite has a loading capacity up to 1175.8 mg g(-1), implying that this bi-functional graphene oxide-based nanocomposite is likely to find applications in some challenging fields such as drug carriers.