Bis(2-ethylhexyl)phosphoric acid (HDEHP) is frequently used as an extractant in the separation and recovery of lanthanides by solvent extraction and extraction chromatography, where HDEHP (stationary phase) is fixed on an inert support and the mobile phase is an aqueous solution. Because the results of extraction chromatography strongly depend on the support material, in this study, we aim to prepare solid extractants (extraction chromatography materials) with different inorganic supports impregnated with HDEHP for the adsorption of Gd and Tb from HCl solutions, putting emphasis on the effect of the supports on the solid extractant behavior. Gd and Tb partition data were determined in HCl solutions from the prepared extraction chromatography materials using elution analysis. Solid extractants were characterized by X-Ray diffraction, electron microscopy, and infrared spectroscopy in order to determine their properties and to explain their extraction behavior. The characterization of the solid extractants showed a heterogeneous distribution of the HDEHP on the surfaces of the different supports studied. The irregular shape of the support particles produces discontinuous and heterogenous silanization and HDEHP coatings on the support surface, affecting the retention performance of the solid extractant and the chromatographic resolution.

中文翻译：

---

HDEHP制备的不同无机载体上的萃取色谱材料用于d和and的分离

在溶剂萃取和萃取色谱法分离和回收镧系元素时，双（2-乙基己基）磷酸（HDEHP）经常用作萃取剂，其中HDEHP（固定相）固定在惰性载体上，流动相为水相。解。由于萃取色谱法的结果强烈依赖于载体材料，因此在本研究中，我们旨在制备具有不同无机载体的固体萃取剂（萃取色谱法材料），该无机载体浸渍有HDEHP以从HCl溶液中吸附Gd和Tb。载体对固体萃取剂行为的影响。使用洗脱分析从制备的萃取色谱材料的HCl溶液中确定Gd和Tb分配数据。固体萃取剂通过X射线衍射表征，电子显微镜和红外光谱，以确定它们的性质并解释其萃取行为。固体萃取剂的表征显示了HDEHP在所研究的不同载体表面上的不均匀分布。载体颗粒的不规则形状会在载体表面上产生不连续和不均匀的硅烷化和HDEHP涂层，从而影响固体萃取剂的保留性能和色谱分离度。