中文摘要：

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63Ni（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63Ni（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。

英文摘要：

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.