Abstract Bentonite/zeolite hybrid structure was synthesized as adsorbent material for promising retention of U (VI), Sr (II), and Ba (II) as toxic radionuclides in water. The retention of U (VI) and Ba (II) show slight partialities to be described with the Pseudo-First order model and the adsorption of Sr (II) is of slightly higher fitting with Pseudo-Second order model. The equilibrium modeling demonstrated retention processes according to Langmuir assumption with expected qmax of 172.26 mg/g, 123 mg/g, and 187.9 mg/g for U (VI), Ba (II), and Sr (II), respectively. The calculated energies for the retention of U (VI) (1.18 KJ/mol), Ba (II) (0.84 KJ/mol), and Sr (II) (1.24 KJ/mol) suggesting physisorption mechanisms. The retention reactions are of exothermic nature with spontaneous properties. The studied BE/Z hybrid structure is of excellent recyclability properties and is of promising efficiency in reducing Sr (II) and U (VI) from the groundwater sample.

中文翻译：

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对膨润土/沸石混合结构中某些放射性元素（U (VI)、Sr (II) 和 Ba (II)）的有效和环境保留；平衡与现实研究

摘要 合成了膨润土/沸石杂化结构作为吸附材料，有望将 U (VI)、Sr (II) 和 Ba (II) 作为有毒放射性核素保留在水中。U (VI) 和 Ba (II) 的保留显示出用伪一级模型描述的轻微偏向性，而 Sr (II) 的吸附与伪二级模型的拟合略高。平衡模型证明了根据 Langmuir 假设的保留过程，U (VI)、Ba (II) 和 Sr (II) 的预期 qmax 分别为 172.26 mg/g、123 mg/g 和 187.9 mg/g。U (VI) (1.18 KJ/mol)、Ba (II) (0.84 KJ/mol) 和 Sr (II) (1.24 KJ/mol) 保留的计算能量表明物理吸附机制。保留反应具有自发性质的放热性质。