AR-01树脂对铼的吸附和解吸行为

Adsorption and Elution Behavior of Rhenium Using a Porous Silica-Based Anion Exchanger

99 Tc是核电站运行过程中产生的裂变产物之一,是一种具有较高裂变产额的长寿命放射性核素,易在环境中迁移,因此高放废液中锝的分离对于核废料后处理具有重要意义。以铼模拟锝,通过静态实验和动态实验研究了AR-01树脂对铼的吸附和解吸行为,主要考察了温度、酸度、时间等因素对AR-01树脂吸附性能的影响,并通过还原解吸法探讨解吸条件。结果表明:AR-01树脂吸附铼的反应为放热反应,酸度提高,吸附效率降低,在流速1.0mL/min下,树脂的动态饱和吸附容量达到105mg/g,解吸剂中加入还原剂SnCl2提高了解吸效率,树脂具备很好的重复利用性。以上结果为AR-01树脂应用于高放废液中锝的吸附分离提供了参考。

99 Tc is one of the fission products from nuclear power plant, it is a long-lived radio- nuclide with a relatively high fission yield. The separation of technetium from high level liquid waste （HLLW） plays an important role in the nuclear waste reprocessing. In this article, rhenium was selected as the simulating nuclide of technetium. The adsorption and elution behavior of rhenium（Ⅶ） with a porous silica-based anion exchanger AR-01 resin were investigated. The influence of temperature, acid concentration and the equilibrium time on the adsorption were studied. Reductive elution was also studied. The results show that the adsorption is exothermic with fast kinetics, increasing the acid concentration will reduce the adsorption. The dynamic adsorption capacity at flow rate of 1.0 mL/min is 105 mg/g. The addition of SnCl2 to elute solution can improve the efficiency of elution significantly. The resin also has satisfying regeneration property. The research offers reference to study the application of AR-01 resin for the separation of technetium from HLLW.