Adsorption Behavior of Uranium Based on Polyacrylonitrile/Oxidized Graphene Ammoximation Group Polymer

A new type of polyacrylonitrile/oxidized graphene ammoximation group polymers/○P-AO/GO adsorbent was synthesised which had high adsorption capacity and better adsorption selectivity. It was characterized by infrared and XRD. Through static adsorption experiments, the effect of pH, solid-liquid ratio, adsorption time and initial concentration of uranium on the adsorption of uranium were studied. The thermodynamics and kinetics of adsorption process and the relevant equation for matching were also discussed. Results show that the adsorption capacity for uranium increases with the increasing of adsorbent amount, the extension of adsorption time and initial concentration of uranium, but when these factors reach a certain value, the adsorption process reaches equilibrium. The experimental results show that at pH=5, the solid-liquid ratio of 0.6 g/L, the adsorption is basically balanced at 60 min. When the initial concentration is 150 mg/L, the saturated adsorption capacity can reach 237 mg/g. The adsorption of uranium on adsorbent follows Langmuir adsorption isotherm, which indicates that adsorption is monolayer adsorption; and it is in line with quasi-second order kinetic equation, which shows that the adsorption process is the chemical adsorption.