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首页> 外文期刊>Journal of Radioanalytical and Nuclear Chemistry: An International Journal Dealing with All Aspects and Applications of Nuclear Chemistry >Neodymium and samarium recovery by magnetic nano-hydroxyapatite
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Neodymium and samarium recovery by magnetic nano-hydroxyapatite

机译：磁性纳米羟基磷灰石回收钕和mar

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摘要

The removal and recovery of lanthanides has become important because of their wide applications in industry and also in environmental protection. The necessity for these elements requires the selective and effective separation technique. In this study, batch adsorption method as a green technology has been investigated for removal and recovery of Nd and Sm using magnetic nanohydroxyapatite adsorbent (MNHA). According to results, the maximum adsorption capacities of Nd and Sm were calculated as 323 and 370 mg/g at optimum pH 5.5, respectively. Different types of adsorption isotherms and kinetic models were used to describe the Nd and Sm adsorption behavior, and the experimental results fitted Langmuir model and the pseudo-second-order kinetic models well. The adsorption of Nd and Sm was found as endothermic and spontaneous process with respect to obtained thermodynamic parameters. Recovery of adsorbed lanthanides and reusability of adsorbent was tested. Possible adsorption mechanisms were also discussed. The proposed adsorbent, MNHA has good adsorption ability and high sorption capacity for Nd and Sm with a chemisorption mechanism.
机译：由于镧系元素在工业和环境保护中的广泛应用，其去除和回收已变得很重要。这些元素的必要性要求选择性和有效的分离技术。在这项研究中，采用磁性纳米羟基磷灰石吸附剂（MNHA）研究了间歇吸附法作为一种绿色技术，用于去除和回收Nd和Sm。根据结果​​，在最佳pH 5.5下，Nd和Sm的最大吸附容量分别计算为323和370 mg / g。用不同类型的吸附等温线和动力学模型描述了Nd和Sm的吸附行为，实验结果很好地拟合了Langmuir模型和伪二级动力学模型。关于获得的热力学参数，发现Nd和Sm的吸附是吸热和自发过程。测试了吸附的镧系元素的回收率和吸附剂的可重复使用性。还讨论了可能的吸附机理。所提出的吸附剂MNHA具有良好的吸附能力，并具有化学吸附机理，对Nd和Sm具有较高的吸附能力。

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