放射性核素63Ni(Ⅱ)在膨润土上的吸附  

Sorption of Radionuclide ^(63)Ni(Ⅱ) on Bentonite

作　　者：陈亮[1] 于少明[1] 胡君[2] CHEN Liang YU Shao-ming HU Jun 

机构地区：[1]合肥工业大学化工学院,安徽合肥230009 [2]中国科学院等离子体物理研究所,安徽合肥230031 [3]School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China [4]Institute of Plasma, Chinese Academy of Science, Hefei 230031, China

出　　处：《核化学与放射化学》2012年第6期352-357,共6页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(20971033;21107115)

摘　　要：通过傅立叶变换红外光谱(FTIR)、X射线衍射(XRD)、扫描电子显微镜(SEM)等测试手段对膨润土的物相组成、微观形貌特征等进行了表征。采用静态批式法研究了膨润土对溶液中63 Ni(Ⅱ)的去除效果,考察了吸附时间、pH以及共存阳离子等因素对其吸附性能的影响。膨润土对63 Ni(Ⅱ)吸附符合拟二级动力学方程且受到pH和离子强度影响较大。在低pH时,离子交换和外层络合是主要机理;随着pH增大发生去质子化反应,内层络合或者表面沉淀是主要机理。此外,共存电解质阳离子及腐植酸均对吸附影响显著。In this work, the bentonite was characterized by Fourier transform infrared （FTIR） spectroscopy, X-ray powder diffraction（XRD）, scanning electron microscope （SEM）. The sorption of radionuclide 6aNi（ Ⅱ ） on bentonite was investigated by batch tech- nique under ambient conditions. The effect of contact time, pH and coexistent electrolyte cations on 63Ni（ Ⅱ ） sorption to bentonite was examined. The results demonstrate that the kinetic adsorption data is well described by the pseudo-second-order model and the sorption of 63Ni（ Ⅱ ） is strongly dependent on pH and ionic strength at low pH values. The sorption of 63 Ni（ Ⅱ ） is dominated by outer-sphere surface complexation or ion exchange at low pH, whereas inner-sphere surface complexation is the main sorption mechanism at high pH. In addition, the removal of 6aNi（ Ⅱ ） to bentonite is also strongly affected by FA and cations.

关 键 词：膨润土 吸附 63Ni(Ⅱ) 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护]