核化学与放射化学2012，Vol.34Issue(6)：364-368,5.
63Ni(Ⅱ)在高岭土上的吸附行为和模型研究
Investigation of Radionuclide 63Ni(Ⅱ) Sequestration Mechanism and Model Study on Kaolinite
摘要
Abstract
The uptake of radionuclide on kaolinite has been investigated extensively due to its low penetrability and high sorption capacity. Herein, kaolinite was characterized by acid-base titration. The uptake behavior of 63Ni( II ) on kaolinite as a function of pH and ionic strength was studied by using batch technique under ambient conditions. The experimental data of 63Ni( II ) sorption on kaolinite was obtained using the diffuse layer model combined with the FITEQL 4. 0 program and the consecutive acidity constants as pKa were optimized simultaneously. The uptake of 63Ni( II ) on kaolinite contains =XONi+ species at low pH values and = YONi+ species at high pH values. Macroscopic experiment results show that the uptake of 63Ni( TJ ) is greatly dependent on ionic strength at pH<8. 5, and independent of ionic strength at pH>8. 5. At low pH, the uptake of 63Ni( II ) is predominated by ion exchange and/or outer-sphere surface complexation with A13+/H+ on kaolinite surface, whereas inner-sphere surface complexation is the primary uptake mechanism at high pH values. The macroscopic uptake data of 63Ni( II ) surface speciation at the kaolinite/water interface should be significant to evaluate and predict the migration and uptake behavior of 63Ni( II ) in environment mediums.关键词
放射性核素63Ni(Ⅱ)/高岭土/pH/吸附Key words
radionuclide 63Ni( II ) / kaolinite/ pH/ sorption分类
能源科技引用本文复制引用
宗鹏飞,王海,潘晖,邵大冬,赵耀林,贺朝会..63Ni(Ⅱ)在高岭土上的吸附行为和模型研究[J].核化学与放射化学,2012,34(6):364-368,5.基金项目
国家自然科学基金资助项目(No.21007074) （No.21007074）
中央高校基本科研业务费专项资助项目 （）
