Behavior and analysis of Cesium adsorption on montmorillonite mineral |
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| Authors: | Jiaojiao Wu Bing Li Jiali Liao Yue Feng Dong Zhang Jun Zhao Wei Wen Yuanyou Yang Ning Liu |
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| Institution: | aKey Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, 29 WangJiang Road, Chengdu 610064, P.R. China;bInstitute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, P.R. China |
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| Abstract: | The adsorption of Cs by montmorillonite and the effects of experimental conditions on adsorption were investigated by using 134Cs as a radioactive tracer. Additionally, the Cs-adsorbed and the modified montmorillonite were analyzed by X-ray Diffractometer System (XRD) and Scanning Electron Microscopy (SEM). The results showed that the adsorption of Cs by montmorillonite was efficient in the initial concentration (C0) of 30 μg/L Cs nitrate solution with 20 g/L montmorillonite at room temperature. In this condition, more than 98% Cs+ ions could be adsorbed at pH  8. The adsorption equilibrium was achieved within 5 min and the relationship between the concentration of Cs+ in aqueous solutions and adsorption capacities of Cs+ can be described by the Langmuir adsorption isotherm. The adsorption rate would decrease when temperature increase from 0 °C to 50 °C or in presence of coexistent K+, Na+ and Ca2+, while modification by (NH4)2SO4, Ag(NH3)2]+, Cu(NH3)4]2+ or 450 °C could improve the adsorption abilities of montmorillonite for Cs+. However, more than 89% of adsorbed Cs+ on montmorillonite could be desorbed by 2 mol/L HNO3 solutions. The XRD and SEM analysis further showed that the structure of the Cs-adsorbed or modified montmorillonite were different from that of the original one. |
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| Keywords: | Cs+ 134Cs Montmorillonite Adsorption XRD SEM |
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