6,6′-bis (5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-benzo[1,2,4]triazin-3-yl) [2,2′]bipyridine, an effective extracting agent for the separation of americium(III) and curium(III) from the lanthanides
6,6′-bis (5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-benzo[1,2,4]triazin-3-yl) [2,2′]bipyridine, an effective extracting agent for the separation of americium(III) and curium(III) from the lanthanides
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DOI：
10.1080/07366290600761936
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发表时间：
2006-01-01
影响因子：
2
通讯作者：
Hudson, Michael J.
中科院分区：
文献类型：
--
作者：
Geist, Andreas;Hill, Clement;Hudson, Michael J.
本文研究了6，6 ′-双（5，5，8，8-四甲基-5，6，7，8-四氢苯并[1，2，4]三嗪-3-基）-[2，2 ′]联吡啶（CyMe（4）-BTBP）从硝酸中萃取镅（III）、铥（III）和镧系元素（III）的性能。由于萃取动力学缓慢，因此加入N，N ′-二甲基-N，N ′-二辛基-2-（2-己氧基-乙基）丙二酰胺（DMDOHEMA）作为相转移试剂。用0.01M CyMe（4）-BTBP +0.25M DMDOHEMA在正辛醇中的混合物，在混合5分钟内达到萃取平衡.在1 M的硝酸浓度下，约为1.5 M的镅（III）分配比。10已实现获得了在50（镝）和1500（镧）之间的镅（III）/镧系元素（III）分离因子。而镅（III）和铥（III）提取的溶解物，镧系元素（III）配合物的化学计量没有明确确定，由于DMDOHEMA的存在。在不存在DMDOHEMA的情况下，镅（III）和铕（III）均以溶出物形式提取。用0.1 M硝酸反萃取在化学上是可能的，但相当慢。使用pH=4的缓冲乙醇酸盐溶液，在混合的5分钟内获得0.01的镅（III）分配比。没有提取剂降解的证据，例如，CyMe（4）-BTBP在用1 M硝酸水解期间的提取性能在两个月的接触中没有变化。
The extraction of americium(III), curium(III), and the lanthanides(III) from nitric acid by 6,6'- bis (5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-benzo[1,2,4]triazin-3-yl)-[2,2']bipyridine (CyMe(4)-BTBP) has been studied. Since the extraction kinetics were slow, N,N'-dimethyl-N,N'-dioctyl-2-(2-hexyloxy-ethyl)malonamide (DMDOHEMA) was added as a phase transfer reagent. With a mixture of 0.01 M CyMe(4)-BTBP + 0.25 M DMDOHEMA in n -octanol, extraction equilibrium was reached within 5 min of mixing. At a nitric acid concentration of 1 M, an americium(III) distribution ratio of approx. 10 was achieved. Americium(III)/lanthanide(III) separation factors between 50 (dysprosium) and 1500 (lanthanum) were obtained. Whereas americium(III) and curium(III) were extracted as disolvates, the stoichiometries of the lanthanide(III) complexes were not identified unambiguously, owing to the presence of DMDOHEMA. In the absence of DMDOHEMA, both americium(III) and europium(III) were extracted as disolvates. Back-extraction with 0.1 M nitric acid was thermodynamically possible but rather slow. Using a buffered glycolate solution of pH=4, an americium(III) distribution ratio of 0.01 was obtained within 5 min of mixing. There was no evidence of degradation of the extractant, for example, the extraction performance of CyMe(4)-BTBP during hydrolylsis with 1 M nitric acid did not change over a two month contact.