College of Chemistry , Liaoning University , Shenyang 110036 , China.
ACS Appl Mater Interfaces. 2019 Mar 27;11(12):11772-11781. doi: 10.1021/acsami.9b00476. Epub 2019 Mar 18.
The increasing demand for rare-earth elements (REEs) due to their extensive high-tech applications has encouraged the development of new sustainable approaches for REE recovery and separation. In this work, a series of acrylic acid-functionalized metal-organic framework materials (named as y-AA- x@MIL-101s) were prepared and used for selective adsorption of Sc(III). The adsorbent was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, nitrogen adsorption, X-ray photoelectron spectroscopy, and zeta potential and surface functional-group titration. The adsorption isotherm and kinetics data were accurately described by the Langmuir and pseudo-second-order models. The adsorption capacity of the material for Sc(III), Nd(III), Gd(III), and Er(III) was 90.21, 104.59, 58.29, and 74.94 mg g, respectively. Importantly, the adsorbent was better for selective recovery of Sc(III) not only from the 16 REE mixed system but also the Cu(II), Zn(II), Mn(II), Co(II), and Al(III) coexistence solution. Except for Sc(III), the material displayed high affinity for Nd(III) in the light rare-earth mixture and for Gd(III) in the middle rare-earth mixture. All in all, this study provides a new method for separation and recovery of REEs, which makes this work highly significant in separation and enrichment.
由于稀土元素（REEs）在高科技应用中的广泛需求，鼓励了开发新的可持续方法来回收和分离 REE。在这项工作中，制备了一系列丙烯酸功能化的金属有机骨架材料（命名为 y-AA- x@MIL-101s），并用于选择性吸附 Sc(III)。通过扫描电子显微镜、傅里叶变换红外光谱、X 射线衍射、氮气吸附、X 射线光电子能谱和 Zeta 电位和表面官能团滴定对吸附剂进行了表征。吸附等温线和动力学数据由 Langmuir 和准二级模型准确描述。该材料对 Sc(III)、Nd(III)、Gd(III)和 Er(III)的吸附容量分别为 90.21、104.59、58.29 和 74.94mg/g。重要的是，该吸附剂不仅可以从 16 种 REE 混合体系中，而且可以从 Cu(II)、Zn(II)、Mn(II)、Co(II)和 Al(III)共存溶液中更好地选择性回收 Sc(III)。除了 Sc(III)，该材料在轻稀土混合物中对 Nd(III)和中稀土混合物中对 Gd(III)具有高亲和力。总之，本研究为 REE 的分离和回收提供了一种新方法，这使得这项工作在分离和富集方面具有重要意义。
