▎ 摘　　要

In this paper, polyacrylamide modified graphene oxide (PAM/GO) composites were synthesized and characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray diffraction. The surface site distribution of PAM/GO was simulated with the aid of FITEQL 3.2 code. The synthesized PAM/GO composites were applied to adsorb Sr(II) from aqueous solutions. The adsorption conditions, such as contact time, pH value, and ionic strength, were investigated, which indicated pH and ionic strength dependent adsorption process. The adsorption isotherm agreed well with the Langmuir model, with a maximum adsorption capacity of 2.11 mmol/g at pH = 8.5 +/- 0.1 and T = 303 K. Thermodynamic parameters calculated from the temperature-dependent adsorption isotherms suggested that the adsorption of Sr(II) on PAM/GO composites was an endothermic and spontaneous process. The efficient adsorption suggested that PAM/GO might be a potential candidate for the preconcentration and separation of Sr(II) from wastewater. (C) 2015 Published by Elsevier B.V.