The extraction behavior of several lanthanide ions (La(III), Nd(III), Sm(III), Gd(III), Yb(III)) from the nitric acid medium using ionic liquid [C4mim][NTf2] solvent containing N,N’-dimethyl-N,N’-dioctyl-3-oxadiglycolamide (DMDODGA) was studied. The effects of the concentration of HNO3, H+ and NO3− in aqueous phase, as well as the DMDODGA concentration and temperature on the distribution ratio of Ln(III) were analyzed. The distribution ratio of lanthanide ions into [C4mim][NTf2] is much higher than that reported for aliphatic hydrocarbon diluents. The extraction mechanism was demonstrated to agree with the cation-exchange mechanism. The stoichiometric ratio of Ln (III)/DMDODGA complex is 1:3 or 1:4.

中文翻译：

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DMDODGA在[C4mim][NTf2]离子液体中从硝酸中提取几种镧系元素的行为

几种镧系元素离子（La(III)、Nd(III)、Sm(III)、Gd(III)、Yb(III)）从硝酸介质中使用含有 N 的离子液体 [C4mim][NTf2] 的萃取行为,N'-二甲基-N,N'-dioctyl-3-oxadiglycolamide (DMDODGA) 进行了研究。分析了水相中HNO3、H+和NO3-的浓度，以及DMODGA浓度和温度对Ln(III)分布比的影响。镧系元素离子在 [C4mim][NTf2] 中的分布比远高于脂肪烃稀释剂中报道的分布比例。萃取机制被证明与阳离子交换机制一致。Ln (III)/DMDODGA 复合物的化学计量比为 1:3 或 1:4。