▎ 摘　　要

Superparamagnetic monodisperse Fe3O4/graphene oxide (GO) nanocomposite was successfully synthesized for the first time by a facile one-pot solvothermal synthesis using FeCl3 center dot 6H(2)O as the iron resource, ethylene glycol (EG) as the reaction solvent, NaHCO3 as the precipitant and adding a little amount of GO suspension solution to EG solvent, which was characterized by X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Brunauer-Emmett-Teller (BET) test, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), and Vibrating sample magnetometer (VSM) methods, and its adsorption capacity of Pb(II) by the atomic absorption spectrophotometer (AAS) was investigated. The results showed that the solvothermal treatment time played an important role to particle size and magnetic properties of as-prepared Fe3O4 particles. Highly uniform-sized, well-crystallized, spherical Fe3O4 nanoparticles with a diameter of ca. 60 nm were conveniently prepared at 200 degrees C for 5 hour, which showed a saturation magnetization (M-s) of 49.8 emu.g(-1). During the preparation of Fe3O4/GO nanocomposite, addition of a little amount of GO suspension solution to EG reaction solvent can significantly improve the particle dispersibility and obviously decrease the particle size of as-prepared Fe3O4 nanoparticles, which were less than 20 nm in the diameter and were near monodisperse, and the graphene oxide in Fe3O4/GO nanocomposite had been partially reduced. Fe3O4/GO nanocomposite exhibited a superparamagnetic behavior with M-s of 41.8 emu.g(-1), and can significantly improve the adsorption capacity of Pb(II) than the one of pure Fe3O4 nanoparticles, and it was promising in the application of heavy metals wastewater treatment.