Cs^+和Yb^(3+)在方解石、高岭石、蒙脱石、绿泥石和海绿石上的吸附实验研究  

STUDY OF ADSORPTION BEHAVIORS OF Cs^+ AND Yb^(3+) ON CALCITE, KAOLINITE,MONTMORILLONITE, CHLORITE AND GLAUCONITE

作　　者：李世红[1] 李春江[1] 于涛 柴之芳[1] 

机构地区：[1]中国科学院高能物理研究所核分析实验室,北京100080

出　　处：《核化学与放射化学》2002年第2期70-76,83,共8页Journal of Nuclear and Radiochemistry

摘　　要：用静态平衡批试法和放射性示踪技术研究了Cs+ 和Yb3 + 共存条件下 ,在方解石、高岭石、蒙脱石、绿泥石和海绿石等 5种矿物上的吸附行为。结果表明 ,在相同实验条件下 (液相初始酸度、液固相比和金属离子初始浓度 ) ,按单位质量矿物的吸附量计 ,蒙脱石对Cs+ 和Yb3 + 的吸附能力明显强于其它矿物 ,而其它矿物对Cs+的吸附能力的差异相对不大。Cs+ 和Yb3 + 的吸附率 ,均随金属离子初始浓度的增大呈现减小趋势 ,但Yb3 + 的变化趋势更大。所有吸附等温线均符合Freundlich等温式方程。在实验所用溶液酸度条件下 ,Cs+ ,Yb3 + 在高岭石、蒙脱石和绿泥石中的吸附作用有可能以离子交换反应为主。The adsorption behaviors of Cs + and Yb 3+ on five minerals including calcite, kaolinite, montmorillonite, chlorite and glauconite are simultaneously investigated by the static equilibrium batch experiments with radioactive tracer technique. The experimental results indicate that under same experimental conditions (initial solution acidity, initial ion concentration and liquid solid phase ratio), the adsorption capacity ( Q ) in unit of mmol/g of montmorillonite towards Cs + and/or Yb 3+ are stronger than other 4 minerals, which display no evident difference of Q values. The R d of Cs + and Yb 3+ on the five minerals decrease with increase of their initial concentrations in solution. The uptakes of Cs + are ordinary lower than Yb 3+ except for the high c 0. The adsorption isotherms of Cs + and Yb 3+ are all in fairly agreement with the Freundlichs equation. The adsorption mechanism of Cs + and Yb 3+ in the systems of kaolinite, montmorillonite and chlorite at the experimental pH range is likely attributed to the process of ion exchange.

关 键 词：实验研究 吸附 方解石 绿泥石 蒙脱石 高岭石 海绿石 钯(I) 镱(Ⅱ) 放射性废物 处置 核素迁移 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护]