Novel solvent-impregnated resins (SIRs) were prepared by treatment of styrene–divinylbenzene copolymer (LPS-500) with mixtures of the promising polydentante extractant (2-diphenylphosphoryl)-4-ethylphenoxy)methyl)diphenylphosphine oxide (L) and an ionic liquid [C₄mim]⁺[Tf₂N]⁻for the extraction chromatography recovery of Nd(III) from nitric acid solutions. It was shown that introduction of the ionic liquid into the SIR composition results in considerable enhancement of the Nd(III) recovery efficiency compared with resin impregnated only by L in slightly acidic media. The influence of the L: ionic liquid molar ratio in the SIRs composition, their percentages, concentration of metal and HNO₃ in the eluent, and acid type on the value of synergistic effect and adsorption efficiency of Nd(III) recovery was studied. The SIR containing 40% of mixture of L and [C₄mim]⁺[Tf₂N]⁻ with molar ratio 2:1 turned out to be the most efficient. The selectivity of Nd(III) separation from light and heavy rare-earth elements was studied and the optimal conditions of Nd(III) adsorption recovery and stripping by this SIR were chosen. It was found that in recovery efficiency of Nd(III) developed SIR exceeded the SIR containing Cyanex 923 (a mixture of monodentate trialkylphosphine oxides) and [C₄mim]⁺[Tf₂N]⁻.

中文翻译：

---

基于(2-二苯基磷酰基)-4-乙基苯氧基)甲基)二苯基氧化膦和离子液体混合物的溶剂浸渍树脂，用于从硝酸介质中回收 Nd(III)


通过用有前景的多齿萃取剂(2-二苯基磷酰基)-4-乙基苯氧基)甲基)二苯基氧化膦(L)和离子液体的混合物处理苯乙烯-二乙烯基苯共聚物(LPS-500)制备新型溶剂浸渍树脂(SIR) [C ₄ mim] ⁺ [Tf ₂ N] ^-用于从硝酸溶液中萃取色谱回收 Nd(III)。结果表明，与在微酸性介质中仅用L浸渍的树脂相比，将离子液体引入SIR组合物导致Nd(III)回收效率显着提高。研究了SIRs组成中L与离子液体的摩尔比、它们的百分比、洗脱液中金属和HNO ₃的浓度以及酸类型对Nd(III)回收的协同效应值和吸附效率的影响。含有 40% 的 L 和 [C ₄ mim] ⁺ [Tf ₂ N] ^-摩尔比为 2:1 的混合物的 SIR 被证明是最有效的。研究了SIR从轻重稀土元素中分离Nd(III)的选择性，并选择了SIR吸附回收和反萃Nd(III)的最佳条件。发现在Nd(III)的回收效率方面，所开发的SIR超过了含有Cyanex 923（单齿三烷基膦氧化物的混合物）和[C ₄ mim] ⁺ [Tf ₂ N] ^{- 的}SIR。