The Cs- and Ba-sorption, onto bentonite from Kimolos island (Cyclades, Greece) was investigated in aqueous solutions in the presence of Na⁺, Ca²⁺ and humic acid. Batch experiments were performed using as tracers ¹³⁷Cs and ¹³³Ba and γ-ray spectroscopy. The sorption significantly depended on initial concentration, ionic strength and temperature of the solutions. The sorption isotherms were satisfactorily reproduced by the Langmuir and Freundlich equations. The kinetic experiments at 293, 308 and 323 K and the calculation of the thermodynamic parameters (ΔH, ΔS° and ΔG°) indicated that Cs- and Ba-sorption was spontaneous and endothermic process. The sorbent was characterized before and after the sorption experiments using Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM-EDS). It was demonstrated that the Kimolos bentonite is a good sorbent for cesium and barium from highly contaminated solutions and its sorption capacity reduced in presence of humic acid and competing cations.

在Na ⁺，Ca ²⁺和腐殖酸存在下，研究了Kimolos岛（希腊基克拉泽斯）膨润土上Cs和Ba的吸附情况。使用¹³⁷ Cs和¹³³ Ba和γ射线光谱作为示踪剂进行批处理实验。吸附明显取决于溶液的初始浓度，离子强度和温度。吸附等温线由Langmuir和Freundlich方程令人满意地重现。在293、308和323 K下进行的动力学实验以及热力学参数（ΔH，ΔS°和ΔG°）的计算）表明Cs和Ba的吸附是自发的并且是吸热过程。使用傅立叶变换红外光谱（FT-IR），X射线粉末衍射（XRD）和扫描电子显微镜（SEM-EDS）在吸附实验之前和之后对吸附剂进行表征。事实证明，Kimolos膨润土是高度污染溶液中铯和钡的良好吸附剂，在腐殖酸和竞争性阳离子存在下其吸附能力降低。