Adsorption behaviour of ⁹⁵Zr(IV), ¹⁸¹Hf(IV) and ⁹⁵Nb(V) radionuclides onto bentonite is investigated in this study. Optimization of parameters is governed by conducting the adsorption experiments at different pHs, contact time, adsorbent mass and temperature. Distribution coefficient values of 21,388, 19,869 and 12,866 mL/g for ⁹⁵Zr(IV), ¹⁸¹Hf(IV) and ⁹⁵Nb(V) radionuclides, respectively, are achieved at pH 2.5. Contact time of 120 min was sufficient to reach equilibrium and the Lagergren kinetic model was appropriate to describe the kinetic data of zirconium. Of the studied adsorption isotherms, Redlich–Peterson was the best model to fit the adsorption equilibrium data of zirconium onto bentonite. The maximum adsorption capacity of bentonite toward zirconium is found to be 63.35 mg/g. The obtained values of enthalpy change and free energy change showed that adsorption of radionuclides onto bentonite was endothermic and spontaneous processes. Bentonite succeeded to efficiently remove the studied radionuclides even in presence of high concentrations of foreign ions. Bentonite succeeded to adsorb ⁹⁵Zr(IV), ¹⁸¹Hf(IV) and ⁹⁵Nb(V) radionuclides from radioactive process wastewater with distribution coefficient values of 10,422, 15,453 and 9774 mL/g, respectively.

^{本研究研究了95} Zr(IV)、¹⁸¹ Hf(IV) 和⁹⁵ Nb(V) 放射性核素在膨润土上的吸附行为。通过在不同的 pH 值、接触时间、吸附剂质量和温度下进行吸附实验来控制参数的优化。⁹⁵ Zr(IV)、¹⁸¹ Hf(IV) 和⁹⁵的分配系数值分别为 21,388、19,869 和 12,866 mL/gNb(V) 放射性核素分别在 pH 2.5 时获得。120 分钟的接触时间足以达到平衡，并且 Lagergren 动力学模型适合描述锆的动力学数据。在研究的吸附等温线中，Redlich-Peterson 是拟合锆在膨润土上的吸附平衡数据的最佳模型。膨润土对锆的最大吸附量为 63.35 mg/g。得到的焓变和自由能变化值表明，放射性核素在膨润土上的吸附是吸热和自发过程。即使存在高浓度的外来离子，膨润土也成功地有效去除了所研究的放射性核素。膨润土成功吸附⁹⁵ Zr(IV)、¹⁸¹ Hf(IV) 和⁹⁵放射性工艺废水中的 Nb(V) 放射性核素，分布系数值分别为 10,422、15,453 和 9774 mL/g。