▎ 摘　　要

In this paper, the use of graphene oxide (GO), high efficiency and low-risk adsorbent, has been studied for the removal of UO22+ from aqueous solutions. A series of experiments was conducted in a batch system to assess the effect of the system variables, i.e. contact time, initial pH, ionic strength, temperature, solid concentration and humic substances. The results indicated that the uptake is strongly dependent on pH but independent of ionic strength. A stimulative effect of HA/FA on UO22+ uptake was found at pH < 7.0, whereas inhibitory effect was observed at pH > 7.0. The adsorption kinetics of UO22+ uptake on GO was found to follow pseudo-second-order rate kinetic model very well, with a good correlation (R-2 > 0.99), indicating that the chemical adsorption was the rate-limiting step. The Linear, Langmuir, Freundlich, and Dubinin-Redushkevich (D-R) isotherms were used to analyze the equilibrium data at different temperatures, and the Langmuir isotherm model fits the sorption isotherms significantly better than the other three models. The maximum uptake capacity (qmax) reached 2.3532 x 10(-4) mol.g(-1) at 338 K, it is estimated by Langmuir. The thermodynamic analysis derived from temperature dependent uptake isotherms suggests that the uptake process of UO22+ on GO is spontaneous and endothermic. Results also showed that the GO was favourable adsorbent for UO22+.