Influence of Gamma Irradiation on the Adsorption Properties of Mo(Ⅵ) on AG1-×8 Resin

To evaluate the influence of gamma irradiation on adsorption of ⁹⁹Mo on AG1-×8 resin, three irradiated AG1-×8 resin with absorbed doses of 37.5 kGy, 275 kGy and 825 kGy were chosen to investigate the adsorption properties of Mo(Ⅵ) on AG1-×8 resin via the static absorption and the dynamic adsorption experiments. The experimental results showed that no difference of the surface of AG1-×8 resin was observed compared to non-irradiated resin. The static distribution coefficient of Mo(Ⅵ) adsorbed by resin decreased with the increase of absorbed doses, and the static distribution coefficient of Mo(Ⅵ) adsorbed by irradiated and non-irradiated resin was not variable in different concentration of NH₄OH but decreased with increasing the concentration of HNO₃, NaOH, and (NH₄)₂CO₃. The sorption on irradiated and non-irradiated resin both followed Langmuir isotherm model, indicating that each of these adsorption processes was spontaneous and endothermic in nature, and the static saturated adsorption capacity was 74.07 mg/g, 71.02 mg/g, 70.97 mg/g and 57.57 mg/g in 1 mol/L NH₄OH, respectively. While Mo(Ⅵ) was adsorbed in NH₄OH and desorbed with 1 mol/L (NH₄)₂CO₃, the recovery yield of Mo(Ⅵ) decreased with the increase of absorbed doses.