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    Am(Ⅲ)在铁氧化物上的吸附行为

    Adsorption Behavior of Am(Ⅲ) on Fe2O3 and Fe3O4

      摘要
    • 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腐蚀产物上的吸附行为，以我国高放废物处置库预选场址——甘肃北山地区深部地下水为介质，研究了包装容器材料的主要组分铁的腐蚀产物Fe2O3, Fe3O4对Am(Ⅲ)的吸附，讨论了pH值、总CO2-3, SO2-4、腐殖酸、Am(Ⅲ)浓度等对吸附的影响，并就可能的吸附机理进行了探讨。实验结果表明，Am(Ⅲ)在铁氧化物上的吸附分配比随水相pH值增大而增大；地下水的化学组分是影响Am(Ⅲ)存在形态和吸附的关键，Am(Ⅲ)在Fe2O3和Fe3O4上的吸附机理为界面配合，可用Freundlich吸附等温式描述。

       

      Abstract: The adsorption behavior of Am(Ⅲ) on Fe2O3 and Fe3O4 were studied in BS03 well groundwater(sampled from drilling well BS03 at Beishan(BS) area—a potential site for China’s high level radioactive waste repository) by a batch technique at (25±1) ℃. The influences of pH， sulphate ion， total carbonate ion， humic acid， and concentration of the Am(Ⅲ) on the adsorption behavior were also studied， and the possible adsorption mechanisms were discussed. Experimental results show that the adsorption distribution ratio of Am(Ⅲ) on Fe2O3 and Fe3O4 are increased with increasing pH value of the aqueous phase. The chemical composition of the groundwater is the main factor which influence the species of Am(Ⅲ) and adsorption. The adsorption mechanism of Am(Ⅲ) on Fe2O3 and Fe3O4 is surface complexation. The adsorption isotherm of Am(Ⅲ) on Fe2O3 and Fe3O4 can be described by the Freundlich’s equation.

       

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