▎ 摘　　要

beta-Cyclodextrin modified graphene oxide (denoted as beta-CD-GO) was synthesized and applied as a sorbent to remove Co(II) from aqueous solution. The synthesized beta-CD-GO was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM/EDX), Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) in detail, and the results of the characterization indicated that beta-CD was successfully grafted onto the surface of GO. The effects of pH, ionic strength, competing ions and solid content on the sorption of Co(II) onto the beta-CD-GO nanocomposites were investigated. The results indicated that Co(II) sorption on beta-CD-GO was strongly dependent on pH and independent of ionic strength under the experimental uncertainties. The sorption isotherms of Co(II) on beta-CD-GO could be described well by the Langmuir model. The thermodynamic data (DH0, DS0 and DG(0)) calculated from the temperature-dependent sorption isotherms suggest that the sorption of Co(II) on beta-CD-GO is a spontaneous and endothermic process. The maximum sorption capacity of Co(II) on beta-CD-GO (72.4 mg g(-1)) at pH = 6.0 +/- 0.1 and T = 303 K was much higher than that of Co(II) on GO (47.39 mg g(-1)) and other sorbents. The abundant oxygen-containing functional groups of modified beta-CD on the GO surface can improve the sorption capacity of beta-CD-GO for Co(II). The results indicate that beta-CD-GO is a promising material for the removal and enrichment of Co(II) from wastewater.