铀、钚等在某岩土介质上的吸附及其动力学  

Adsorption and Kinetics of Uranium,Plutonium and Other Nuclides on Geotechnical Media

作　　者：谢添 陈超[1] 朱君[1] 石云峰[1] 李婷 张艾明[1] XIE Tian;CHEN Chao;ZHU Jun;SHI Yun-feng;LI Ting;ZHANG Ai-ming(China Institute for Radiation Protection Key Laboratory of Nuclear Environmental Simulation and Evaluation Technology,Taiyuan 030006,China)

机构地区：[1]中国辐射防护研究院核环境模拟与评价技术重点实验室,山西太原030006

出　　处：《核化学与放射化学》2021年第4期353-361,共9页Journal of Nuclear and Radiochemistry

摘　　要：选择甘肃嘉峪关地区细砂、强风化花岗岩、粉质粘土三种具有代表性岩土介质,通过静态批式实验获得U、^(239) Pu、^(241) Am和^(244) Cm在三种岩土介质上的吸附动力学过程,采用准二级动力学模型及动边界模型对实验结果进行了拟合,结果表明:U、^(239) Pu、^(241) Am和^(244)Cm在三种岩土介质上的吸附均符合准二级动力学模型。动边界模型拟合结果表明:U在细砂以及粉质粘土介质上的吸附主要受膜扩散控制,在强风化花岗岩介质上的吸附主要受化学反应控制;^(239)Pu在细砂以及强风化花岗岩介质上的吸附主要受膜扩散控制,在粉质粘土上的吸附主要受化学反应控制;^(241)Am在三种岩土介质上的吸附主要受膜扩散控制;^(244)Cm在三种岩土介质上的吸附主要受颗粒扩散控制。Three representative media including fine sand,strongly weathered granite and silty clay in Jiayuguan area,Gansu Province were selected,and the adsorption kinetic process of U,^(239) Pu,^(241) Am and ^(244) Cm on the three media through static batch experiment were investigated.The experimental results were fitted using quasi-second-order dynamic model and the moving boundary model.The results confirm that the adsorption of U,^(239)Pu,^(241) Am and ^(244) Cm on the three media can be described by the quasi-second-order dynamic model,and the fitting results of the moving boundary model are as follows:the adsorption of U on fine sand and clay media is mainly controlled by liquid film diffusion,and on strongly weathered granite is mainly controlled by chemical reactions;the adsorption of 239 Pu on fine sand and strongly weathered granite is mainly controlled by liquid film diffusion,and on clay is mainly controlled by chemical reactions;the adsorption of ^(241)Am on the three media is mainly controlled by liquid film diffusion;the adsorption of ^(244) Cm on the three media is mainly controlled by intra-particle diffusion.

关 键 词：后处理厂 U ^(239)Pu ^(241)Am ^(244)Cm 吸附分配系数 吸附动力学 

分 类 号：O647.32[理学—物理化学]