▎ 摘　　要

Graphene oxide (GO) was synthesized using the modified Hummers method and characterized by XRD and FTIR. The sorption of Co-60(II) on GO as a function of contact time, pH, polyacrylic acid, ionic strength, temperature and solution concentration was studied by batch technique. The sorption kinetics indicated that the sorption of Co-60(II) on GO could be simulated by the pseudo-second-order model very well. The maximum sorption capacities of GO for Co-60(II) calculated from Langmuir model at pH 6.40 and T = 300 K was similar to 62.0 mg/g. The thermodynamic parameters from the temperature-dependent sorption isotherms indicated that the Co-60(II) sorption on GO was an endothermic and spontaneous process. The interaction mechanism between GO and Co(II) were outer-sphere surface complexation or ion exchange at pH <7, whereas the inner-sphere surface complexation was observed at pH 7-9 in terms of the analysis of XPS spectra.