Am(Ⅲ)在Al2O3和石英上的吸附行为  

Adsorption Behavior of Am(Ⅲ) on Al_2O_3 and Quartz

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]清华大学核能与新能源技术研究院,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2期72-78,共7页Journal of Nuclear and Radiochemistry

摘　　要：研究了Am（Ⅲ）在Al2O3和石英上的吸附行为,探讨了水相pH值、总CO32-和SO42-浓度（1.0×10-3~2.0×10-1mol/L）、腐殖酸和Am（Ⅲ）浓度等因素对吸附的影响,并对可能的吸附机理进行了分析,同时以1.0 mol/L HCl做为解吸剂,对吸附平衡后的固相进行了解吸实验。结果表明,随着水相pH值的升高,Am（Ⅲ）在Al2O3和石英上的吸附分配比增大,水相的化学组分及其相应浓度增大对Am（Ⅲ）在石英上的吸附影响较明显;Am（Ⅲ）在Al2O3和石英上以界面配合物的形式吸附,且可用Freundlich吸附等温式描述;水相中腐殖酸浓度增大,Am（Ⅲ）在Al2O3和石英上的吸附降低。The adsorption behavior of Am（Ⅲ） on Al2O3 and quartz 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. After adsorption equilibrium of Am （Ⅲ） on Al2O3 and quartz, the desorption behavior of Am（Ⅲ） from Al2O3 and quartz were studied with 1.0 mol/L HCl. Experimental results show that the adsorption distribution ratio of Am（Ⅲ） on Al2O3 and quartz increases with pH value of the aqueous phase increasing. The chemical composition of the groundwater is the main factor to influence the species of Am（ Ⅲ ） and adsorption. The adsorption mechanism of Am（ Ⅲ ） on Al2O3 and quartz are surface complexation. The adsorption isotherm of Am（ Ⅲ） on Al2O3 and quartz can be described by the Freundlich＇s equation.

关 键 词：Am(Ⅲ) 吸附 解吸 AL2O3 石英 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护]