ABSTRACT

The article presents the novel binary mixtures of neodecanoic acid (HA) with diacylated ethylene amines (L), synthesized in our laboratory, for the recovery and separation of trivalent lanthanides. The extraction of Er(III), representing heavy lanthanides, from nitrate solutions has been studied using mixtures of HA with diacylated ethylenediamine, diacylated diethylenetriamine, and diacylated triethylenetetramine in tetrachloromethane. The FT-IR spectra for HA, L, and their mixtures have been analyzed to investigate the interaction in the binary mixtures. The effects of the nature of diluent, the aqueous phase acidity, and variation of one extractant at a fixed concentration of the other extractant have been investigated. The extracted species were determined to be [Er(OH)A₂·L] by the slope analysis method, and the extraction mechanism was proposed. At pH values above 6.5, the [Er(OH)₂A·L] species begin to prevail in the organic phase. Separation factors for Nd/Pr, Gd/Pr, Er/Pr, and Er/Gd pairs have been calculated to evaluate the possibility of the separation of lanthanides in the proposed mixed-extractant systems.

摘要

本文介绍了在我们的实验室中合成的新癸酸（HA）与二酰化乙烯胺（L）的新型二元混合物，用于回收和分离三价镧系元素。使用HA与二酰化乙二胺，二酰化二亚乙基三胺和二酰化三亚乙基四胺在四氯甲烷中的混合物研究了从硝酸盐溶液中萃取代表重镧系元素的Er（III）。分析了HA，L及其混合物的FT-IR光谱，以研究二元混合物中的相互作用。研究了稀释剂的性质，水相酸度以及一种萃取剂在另一种萃取剂的固定浓度下的变化的影响。提取的物质被确定为[Er（OH）A ₂·L]的斜率分析方法，并提出了提取机理。在pH值高于6.5时，[Er（OH）₂ A·L]物质开始在有机相中占主导地位。已计算出Nd / Pr，Gd / Pr，Er / Pr和Er / Gd对的分离因子，以评估拟议的混合萃取体系中镧系元素分离的可能性。