Ion exchange behavior of astatine and bismuth
Ion exchange behavior of astatine and bismuth
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砹与铋的离子交换行为
DOI：
10.1039/d3nj01316b
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发表时间：
2023
影响因子：
3.3
通讯作者：
Berko, Matthew
中科院分区：
文献类型：
--
作者：
Tereshatov, Evgeny E.;Burns, Jonathan D.;Schultz, Steven J.;Green, Brooklyn D.;Picayo, Gabriela A.;McCann, Laura A.;McIntosh, Lauren A.;Tabacaru, Gabriel C.;Abbott, Austin;Berko, Matthew
本文研究了几种离子交换树脂从硝酸介质中吸附阿斯顿汀和铋的性能。这项工作包括市售树脂Dowex 50 × 4，MP硫醇，Dowex 1 × 8和TEVA。使用离子交换剂分离和纯化<$的主要优点之一是与萃取色谱树脂相比，流出物中不存在任何有机介质。在高达4 M HNO 3溶液中研究了上述金属的行为。测定的分配系数大于1的所有树脂的研究，达到104的MP硫醇和TEVA树脂。硝酸与Cl-形式的阴离子交换剂的相互作用导致交换反应，其中可以形成AtO+氯络合物。为了理解在这些条件下的<$A行为，重新评估了AtOCl和AtOCl 2 −络合物的稳定常数，并消除了文献值中的差异。对于每一种树脂的热力学模型已经开发，建议一个可能的机制，<$吸附。综述了硝酸介质中树脂吸附铋的文献和新的实验数据，并提出了描述其行为的数学模型。分配给相同树脂和酸度的At和Bi的相应拟合函数的比率已被用来估计这些元素的分离因子。
Astatine and bismuth sorption on several ion exchange resins from nitric acid media has been studied. This work covers commercially available resins Dowex 50 × 4, MP thiol, Dowex 1 × 8, and TEVA. One of the main advantages of using ion exchangers for astatine separation and purification is the absence of any organic media in the effluent in comparison with extraction chromatography resins. The behavior of the above-mentioned metals was investigated in up to 4 M HNO3 solutions. The determined distribution coefficients are greater than 1 for all the resins studied, reaching 104 for MP thiol and TEVA resins. The interaction of nitric acid with an anion exchanger in Cl-form results in an exchange reaction, where AtO+ chloro complexes can form. To understand the astatine behavior under these conditions, stability constants of AtOCl and AtOCl2− complexes have been reevaluated and discrepancy in the literature values has been eliminated. For each resin a thermodynamic model has been developed to suggest a possible mechanism of astatine sorption. Literature and new experimental data on bismuth sorption by studying resins in nitric acid media have been reviewed and a mathematical model to describe its behavior has been suggested. A ratio of corresponding fit functions of At and Bi assigned to the same resin and acidity has been used to estimate the separation factors of these elements.