Pu在铁及铁氧化物上的吸附行为研究

Sorption Behavior of Pu on Fe, FeO, Fe₂O₃, and Fe₃O₄

摘要: 为了解放射性核素在可能作为高放废物固化体包装容器材料及其腐蚀产物上的吸附行为，研究了包装容器材料的主要组分铁及铁的腐蚀产物FeO,Fe₂O₃,Fe₃O₄对Pu的吸附行为，探讨了水相pH值（1.0~10.0），CO₃^2-离子浓度（4.0 mmol/L~0.1 mol/L）等因素对吸附的影响。实验结果表明，Pu在铁及其氧化物上的吸附能力随水相pH值增大而增大；实验环境中氧浓度变化对Pu在铁及其氧化物上的吸附影响较小；CO₃^2-浓度增大不利于Pu的吸附。

Abstract: The sorption behavior of Pu on Fe, FeO, Fe₂O₃ and Fe₃O₄ powder are studied with batch experiment at ambient temperature. Sorption experiments are performed under atmospheric and anae-robic conditions (in an argon glove box with an oxygen content of less than 5×10^-6). The experimental results show that the sorption ability of Pu on Fe, FeO, Fe₂O₃ and Fe₃O₄ powder is increased with increasing pH value(1.0~10.0) of the aqueous phase, and decreased with increasing carbonate ion concentration (4.0×10^-3 mol/L~1.0×10^-1 mol/L) in the aqueous phase. The oxygen concentration of the experimental conditions has less influence on the sorption of Pu on Fe, FeO, Fe₂O₃, and Fe₃O₄ powder. The sorption isotherms of Pu on Fe, FeO, Fe₂O₃, and Fe₃O₄ powder can be well described by the Freundlich’s equation.