Synergistic solvent extraction of trivalent americium and europium by 2-bromodecanoic acid and neutral nitrogen-containing reagents
Synergistic solvent extraction of trivalent americium and europium by 2-bromodecanoic acid and neutral nitrogen-containing reagents
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DOI：
10.1080/07366299908934610
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发表时间：
1999-03
影响因子：
2
通讯作者：
I. Hagström;L. Spjuth;Å. Enarsson;J. Liljenzin;M. Sk̊alberg;M. Hudson;P. Iveson;C. Madic;P. Co
中科院分区：
文献类型：
--
作者：
I. Hagström;L. Spjuth;Å. Enarsson;J. Liljenzin;M. Sk̊alberg;M. Hudson;P. Iveson;C. Madic;P. Co
研究了2-溴癸酸与不同含氮萃取剂对三价锕系元素（Am和Cm）和部分镧系元素的协同增效作用。研究了2-溴癸酸分别与2，2 ′：6 ′，2 ′双′三联吡啶或N，N ′-二甲基-N，N ′-二环己基十四烷基丙二酰胺（DMDCHTDMA）在叔丁基苯（TBB）或氢化四丙烯（TPH）中的萃取行为，并与2，4，6-三（2-吡啶基）-1，3，5-三嗪（TPTZ）与2-溴癸酸的协同萃取进行了比较。与丙二酰胺混合物相比，三联吡啶混合物对镅和铕的协同增效作用和分离因子更高。在硝酸（0.01 M）与三联吡啶（0.02 M）、2-溴癸酸（1 M）的TBB溶液中，镅和铕之间的分离因子测定为7，而在TBB溶液中丙二酰胺（0.1 M）、2-溴癸酸（1 M）的分离因子约为3。这可能表明在锕系元素-三联吡啶复合物中比在锕系元素-丙二酰胺复合物中更共价的特征。三联吡啶被证明是很容易转移到水相时，质子化，从而三联吡啶的质子化能力进行了研究，在不同浓度的三联吡啶和2-溴癸酸。还进行了确定M（III）萃取络合物与协同混合物的化学计量的研究。
The synergistic enhancement in the extraction of trivalent actinides (Am and Cm) and some lanthanides by 2-bromodecanoic acid and different nitrogen-0containing extractants was studied. The extraction by mixtures of 2-bromodecanoic acid and 2,2{prime}:6{prime},2{double_prime}-terpyridine or N,N{prime}-dimethyl-N,N{prime}-dicyclohexyltetradecyl malonamide (DMDCHTDMA) respectively, in tert-butylbenzene (TBB) or hydrogenated tetrapropene (TPH), was investigated and compared with 2,4,6-tri(2-pyridyl)-1,3,5-triazine (TPTZ) in synergy with 2-bromodecanoic acid. The synergistic enhancement and the separation factor between americium and europium was higher with the terpyridine mixture compared with the malonamide mixture. The separation factor between americium and europium from nitric acid (0.01 M) with terpyridine (0.02 M), 2-bromodecanoic acid (1 M) in TBB was determined to be 7, while the separation factor for malonamide (0.1 M), 2-bromodecanoic acid (1 M) in TBB was approximately 3. This might indicate a more covalent character in the actinide-terpyridine complex than in the actinide-malonamide complex. The terpyridine was shown to be easily transferred to the aqueous phase when protonated and thus the protonation ability for terpyridine was investigated at different concentrations of terpyridine and 2-bromodecanoic acid. Studies to determine the stoichiometry of the M(III) extracted complex with the synergistic mixtures were also performed.