超铀元素Am在膨润土上的吸附行为研究  

Sorption behavior of transuranic element Am on bentonite

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：《世界核地质科学》2008年第1期47-53,共7页World Nuclear Geoscience

摘　　要：以甘肃北山BS03井地下水为水相,研究了Am(Ⅲ)在膨润土上的吸附行为,讨论了多种因素,如pH值、Na+、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。结果表明:膨润土对Am(Ⅲ)具有较强的吸附能力,并与Am(Ⅲ)在水相中的存在形态有关;Am(Ⅲ)在膨润土上的吸附机理为界面配合,且为不可逆吸附;地下水中无机离子(Na+、SO42-和CO32-)浓度增大,不利于膨润土对Am(Ⅲ)的吸附;水相中腐殖酸的浓度增大,Am(Ⅲ)在膨润土上的吸附能力明显降低。Am(Ⅲ)在膨润土上的吸附可用Freundlich吸附等温式描述。The sorption behavior of Am（Ⅲ）on bentonite is studied in BS03 well groundwater （sampled from drilling well BS03 at Beishan area） by a batch technique at（25±1 ）℃. The influences of pH, sodium ion, sulphate ion, total carbonate ion, humic acid and concentration of the Am（Ⅲ） on the sorption behavior are also studied, and the possible sorption mechanism is discussed. Experimental results show that the sorption ability of Am（Ⅲ）on bentonite is increased with the increasing pH value of the aqueous phase, and decreased with the increasing sodium ion （0.01-1.0 mol/L）, sulphate ion （0.01-0.2 mol/L）, total carbonate ion （0.01-0.2 mol/L）and humic acid concentration （5-120 mg/L）in the aqueous phase. The sorption mechanism of Am （Ⅲ） on bentonite is surface complexation and irreversible. The sorption isotherms of Am（ Ⅲ ）on bentonite can be well described by the Freundlich＇s equation.

关 键 词：Am(Ⅲ) 膨润土 吸附 

分 类 号：P619.1[天文地球—矿床学] P619.255[天文地球—地质学]