伊利石对Sr的反应性吸附及机理表征  

Reactive Adsorption and Mechanism Characterization of Sr on Illites

作　　者：蔡伟海 左锐[1,2] 刘月鹏 王金生[1,2] 杜璨 徐云翔 武子一 CAI Wei-hai;ZUO Rui;LIU Yue-peng;WANG Jin-sheng;DU Can;XU Yun-xiang;WU Zi-yi(College of Water Sciences,Beijing Normal University,Beijing 100875,China;Engineering Research Center of Groundwater Pollution Control and Remediation,Ministry of Education,Beijing 100875,China;Hebei Technical Service Center of Ecological Environmental Protection,Shijiazhuang 050051,China;Development and Research Center,China Geological Survey,Beijing 100037,China)

机构地区：[1]北京师范大学水科学研究院,北京100875 [2]地下水污染控制与修复教育部工程研究中心,北京100875 [3]河北省生态环境保护技术服务中心,石家庄050051 [4]中国地质调查局发展研究中心,北京100037

出　　处：《科学技术与工程》2023年第25期11041-11047,共7页Science Technology and Engineering

基　　金：国家重点研发计划(2020YFC1806601);111引智项目(B18006)。

摘　　要：放射性核素在核废物处置场天然屏障介质中的吸附行为对核废物安全处置至关重要。以黏土岩中的常见矿物伊利石为研究对象,通过静态吸附实验探究伊利石对Sr的吸附行为,结合吸附动力学模型和多种表征分析方法探究伊利石对Sr的吸附反应机理。结果表明:伊利石对Sr的吸附行为分为快速吸附(t≤60 min)和缓慢吸附至平衡(60 min≤t≤240 min)两个阶段,符合准一级和准二级动力学模型;在快速吸吸附阶段以物理吸附为主,主要为液膜扩散作用,在缓慢吸附阶段以化学吸附为主,Ca^(2+)、Mg^(2+)等离子与Sr的阳离子交换反应和CO_(3)^(2-)、—OH等官能团与Sr的络合反应是其主要的吸附反应机制。Adsorption behavior of nuclides in natural barrier media of nuclear waste disposal sites is essential for safe disposal of nuclear waste.Taking a common mineral in clay rock of illite as the research object,the adsorption behavior of illite on Sr was explored through static adsorption experiments.The adsorption reaction mechanism of illite on Sr was explored by combining adsorption kinetics model and various characterization analysis methods.The results show that the adsorption behavior of illite on Sr was divided into two stages:rapid adsorption(t≤60 min)and slow adsorption to equilibrium(60 min≤t≤240 min),which conformed to the quasi-firstorder and quasi-second-order kinetic models.In the rapid adsorption stage,physical adsorption is the main mechanism,mainly for liquid film diffusion.In the slow adsorption stage,chemical adsorption is the main mechanism.The cation exchange reaction between Ca^(2+),Mg^(2+)and Sr and the complex reaction between CO^(2-)_(3),—OH and Sr are the main adsorption mechanism.

关 键 词：SR 伊利石 微观表征 吸附机理 

分 类 号：X591[环境科学与工程—环境工程]