A novel solvothermal method for the deposition of Fe3O4 nanoparticles on the surface of graphene oxide (GO) with different ratios was developed. Synthesized Fe3O4/GO nanocomposites were characterized using a transmission electron microscope, X-ray diffraction analyzer, X-ray photoelectron spectroscope, vibrating sample magnetometer, and nitrogen adsorption/desorption test. Results of characterization showed that Fe3O4 nanoparticles were homogeneously deposited onto the surface of GO, and the diameters of Fe3O4 nanoparticles of 1:1 Fe3O4/GO nanocomposites and 2:1 Fe3O4/GO nanocomposites were ∼4 and ∼6 nm, respectively. Saturation magnetizations reached 9.58 and 15.14 emu/g for 1:1 Fe3O4/GO and 2:1 Fe3O4/GO, respectively. Adsorption experiments were carried out subsequently to investigate the adsorption kinetics and isotherms of 17β-estradiol (E2) and Pb(II) onto Fe3O4/GO. In addition, effects of pH on the adsorption of E2 and Pb(II) were also studied. Most interestingly, synergistic adsorption between E2 and Pb(II) was found when different ratios of E2 and Pb(II) were used. In the mixture, adsorption capacity of 10 mg/L of Pb(II) was increased from 14.8 to 20.8 mg/g with the increasing concentration of E2. The possible reason for explanation was discussed.
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