从Nd–Fe–B磁铁合成Pr 3+ / Dy 3+掺杂的Nd 2 O 3纳米复制体的绿色路线,ACS Sustainable Chemistry & Engineering

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从Nd–Fe–B磁铁合成Pr ³⁺ / Dy ³⁺掺杂的Nd ₂ O ₃纳米复制体的绿色路线
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-30 00:00:00 , DOI: 10.1021/acssuschemeng.7b03585
Samane Maroufi ₁ , Rasoul Khayyam Nekouei ₁ , Veena Sahajwalla ₁

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本文详细介绍了绿色和可持续的合成高浓度Pr ³⁺ / Dy ³⁺掺杂Nd ₂ O _3的方法在温和的条件下，通过便捷的均匀沉淀途径从电子废物中获得的Nd-Fe-B磁铁中的纳米颗粒。由于稀土元素的不确定性和全球需求的增加，稀土元素正处于严重的危机之中。稀土元素的未来需求增长主要与Nd-Fe-B磁体的使用有关，Nd-Fe-B磁体是目前使用最广泛的稀土磁体类型之一，并在各种应用中得到了广泛应用。使用从Nd–Fe–B磁铁中得到的REE（即Nd，Pr和Dy），我们应用了一种基于低温尿素的均相沉淀方法，并合成了具有以下性质的结晶RE（即Nd，Pr和Dy）OHCO ₃纳米颗粒：直径为40–50 nm，高比表面积为60 m ² g ^–1。合成REOHCO₃用作通过700°C的热降解过程合成REO纳米颗粒的前体。FE-SEM图像显示合成的REO纳米颗粒继承了其母体的形态。合成的REO纳米复制品的X射线衍射光谱显示为立方相的Nd ₂ O ₃，没有对应于Pr和Dy的第二相的附加峰。高分辨率TEM（HRTEM）的显微照片和所选择的区域（SAED）的电子衍射中的晶体结构，晶体大小，而在晶面间距值的减小的收缩率，这表明钕所合成的纳米颗粒REO表现出变形的³⁺在Nd ₂ O ₃主体晶格被Pr ³⁺和Dy ^3+的掺杂剂替代。本文报道了由Nd–Fe–B磁体新颖合成Pr ³⁺ / Dy ³⁺掺杂的Nd ₂ O ₃纳米颗粒，这为处理稀土关键供应同时将全球范围内的大量废物负担转变为增值产品提供了新的机遇。提供经济和环境效益。

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A Green Route to Synthesize Pr3+/Dy3+-Doped Nd2O3 Nanoreplicas from Nd–Fe–B Magnets

This paper details a green and sustainable process for synthesizing highly concentrated Pr³⁺/Dy³⁺-doped Nd₂O₃ nanoparticles from Nd–Fe–B magnets sourced from e-waste via a facile homogeneous precipitation route under mild conditions. Rare earth elements (REEs) are under a serious crisis owing to their uncertain supply and increasing global demand. REEs’ future demand growth is mainly linked to the use of Nd–Fe–B magnets, which are currently one of the most widely used types of rare-earth magnets with extensive implementation in a variety of applications. Using REEs (i.e., Nd, Pr, and Dy) derived from Nd–Fe–B magnets, we applied a low temperature urea-based homogeneous precipitation method and synthesized crystallized RE (i.e., Nd, Pr, and Dy) OHCO₃ nanoparticles with diameters of 40–50 nm and high specific surface area of 60 m² g^–1. The synthesized REOHCO₃ was used as a precursor for the synthesis of REO nanoparticles through a thermal degradation process at 700 °C. FE-SEM images revealed that the synthesized REO nanoparticles inherited their parent’s morphology. An X-ray diffraction spectrum of the synthesized REO nanoreplicas showed a cubic phase of Nd₂O₃ with no additional peak corresponding to the secondary phases of Pr and Dy. High resolution TEM (HRTEM) micrographs and electron diffraction of the selected area (SAED) of the as-synthesized REO nanoparticles exhibited deformation in crystalline structure, shrinkage of the crystalline size, and a decrease in interplanar distance value, indicating that Nd³⁺ in the Nd₂O₃ host lattice was replaced with dopants of Pr³⁺ and Dy³⁺. Novel synthesis of Pr³⁺/Dy³⁺-doped Nd₂O₃ nanoparticles from Nd–Fe–B magnets reported in this paper confirms a new opportunity to deal with REE critical supply while transforming a globally significant waste burden into value-added products delivering economic and environmental benefits.

更新日期：2018-01-30

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