Am(Ⅲ)在铁氧化物上的吸附行为  

Adsorption Behavior of Am(Ⅲ) on Fe_2O_3 and Fe_3O_4

作　　者：章英杰[1] 冯孝贵[1] 梁俊福[1] 陈靖[1] 苏锐[2] 王驹[2] 

机构地区：[1]清华大学核能和新能源技术研究院,北京102201 [2]核工业北京地质研究院,北京100029

出　　处：《核化学与放射化学》2009年第1期10-15,共6页Journal of Nuclear and Radiochemistry

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CO32-,SO42-、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Fre-undlich吸附等温式描述。The adsorption behavior of Am（ Ⅲ ） on Fe2O3 and Fe3O4 were studied in BSO3 well groundwater（sampled from drilling well BSO3 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.

关 键 词：AM 吸附 FE2O3 FE3O4 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护]