MX-80 bentonite is considered a popular buffer/backfill material for the construction of artificial barriers. In particular, it plays an important role in the disposal of high-level nuclear waste in deep geological repositories. In the present study, the sorption of Eu(III) on MX-80 bentonite was investigated using a batch technique; furthermore, a comprehensive analysis was performed on the influence of contact time, pH, temperature, and concentration on sorption. The results showed that the sorption regime leveled off within 30 min and the Eu(III) sorption capacity of MX-80 bentonite was approximately 46.06 mg/g under certain conditions. A second-order kinetic equation was used to fit the equilibrium sorption data. Additionally, the variation in the sorption capacity of MX-80 bentonite increased as the pH increased from 1 to 9. The optimum pH value was determined to be 7.0 at a temperature of 293.15 K. The negative value of enthalpy change (ΔH^o) indicates that the temperature had a negative effect on the sorption. The sorption process was most accurately described by the Langmuir isotherm model. These results will definitely be benefit to the artificial barriers in the disposal of high-level nuclear waste.

MX-80膨润土被认为是用于建造人工屏障的常用缓冲/回填材料。特别是它在深部地质处置库中处置高级别核废料方面起着重要作用。在本研究中，使用分批技术研究了Eu（III）在MX-80膨润土上的吸附。此外，对接触时间，pH，温度和浓度对吸附的影响进行了综合分析。结果表明，在一定条件下，吸附过程在30分钟内趋于平稳，MX-80膨润土的Eu（III）吸附容量约为46.06 mg / g。使用二阶动力学方程式拟合平衡吸附数据。此外，MX-80膨润土的吸附容量随pH值从1增加到9而增加。H ^o）表明温度对吸附有负面影响。Langmuir等温线模型最准确地描述了吸附过程。这些结果无疑将有利于处理高水平核废料的人为障碍。