Study on Adsorption Property of Uranium Based on Novel Magnetic Chelating Polymer

A new type, high adsorption capacity and mechanical strength and easy separation of dual amidoxime group polymer/Fe₃O₄@SiO₂ adsorbent was synthesized. By 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. The results show that the adsorption capacity for uranium increases with adsorbent amount, 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 the optimal pH is 5, the optimal solid-liquid ratio is 0.6 g/L, the adsorption is basically balanced at 90 min and the initial concentration of uranium is 100 mg/L. Under this condition, the saturated adsorption capacity can reach 160 mg/g. The adsorption of uranium on adsorbent follows Langmuir adsorption isotherm, and is in line with quasi-second order kinetic equation.