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Preparation and evaluation of composite hybrid nanomaterials for rare-earth elements separation and recovery

机译：稀土元素分离和回收复合杂交纳米材料的制备及评价

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摘要

A new technology is necessary to representing an entire process of separation and recovery of rare-earth lanthanides (Ln(III)) elements to keep the eco-system for stable industrial growth. In this study, novel hard and soft donor organic ligand containing mesoporous composite hybrid nanomaterial (CHM) was fabricated for specific ytterbium (Yb(III)) ion separation and recovery in sustainable method. The Yb(III) ion was selected based on the Ln(III) intra-series separation behavior in the solid-liquid separation approach. The present approach was based on basic research of individual process steps with the stable complexation mechanism according to the O- and N-donor coordination. The usual bond distance between Yb-O and Yb-N was 2.206 and 2.847 angstrom, which was clarified that the O-atom was hardly donating than the N-atom of the synthesized organic ligand. However, both atoms were coordinating with Yb(III) ions to clarifying the stable complexation and coordination mechanism. The optimum pH solution was evaluated before selecting the separation and uptake operations and the pH was 5.0 to avoid the hydroxyl precipitation rather than adsorption based on the Ln(III) chemistry. The fabricated CHM was exhibited the high kinetic performances. The adsorption data were highly fitted with the Langmuir isotherms model and the maximum Yb(III) adsorption amount was found 139. 19 mg/g. The results were also affirmed that the effect of competing ions were not affected seriously in the Yb(III) adsorption. After successful adsorption, the Yb(III) ion was recovered with elution operation using 0.40 M HNO3 and the CHM was also regenerated at the same time for next adsorption process after washing with water. Moreover, the reuses of the CHM were possible in several cycles complying the cost-effective potential material in real waste sample treatment.
机译：需要一种新的技术来表示稀土镧系元素的整个分离和恢复过程（LN（III））元素，以保持生态系统稳定的工业生长。在该研究中，制造含有介孔复合杂交纳米材料（CHM）的新型硬质和软供体有机配体，用于特定的镱（YB（III））离子分离和可持续方法中的回收。基于固液分离方法的LN（III）内部分离行为选择Yb（III）离子。本方法是基于根据O-和N-供体配位的稳定络合机制的个体工艺步骤的基本研究。 YB-O和YB-N之间的通常粘合距离为2.206和2.847埃，澄清了O-原子几乎不会比合成的有机配体的N-原子捐赠。然而，两种原子与Yb（III）离子配等，以澄清稳定的络合和配位机制。在选择分离和吸收操作之前评价最佳pH溶液，并且pH为5.0以避免羟基沉淀而不是基于LN（III）化学的吸附。制造的CHM被呈现出高动力学性能。吸附数据高度配备朗米尔等温线模型，最大的Yb（III）吸附量139.19mg / g。结果还肯定了竞争离子的效果在YB（III）吸附中不严重影响。在成功吸附后，使用0.40m HNO 3用洗脱操作回收Yb（III）离子，并且在用水洗涤后，CHM也同时再生进行下一个吸附过程。此外，CHM的重复速度可以在几个循环中符合真正的废物样品处理中的成本效益潜在材料。

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