Mechanism of astatine and bismuth sorption on extraction chromatography resins from nitric acid media
Mechanism of astatine and bismuth sorption on extraction chromatography resins from nitric acid media
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硝酸介质萃取色谱树脂吸附砹和铋的机理
DOI：
10.1016/j.cej.2023.142742
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发表时间：
2023
影响因子：
15.1
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
德克萨斯A&M大学系统地研究了硝酸介质中萃取色谱树脂对At的吸附。这项工作涵盖了市售树脂，如LN，TK 400，SR，TRU和UTEVA。了解At在4 M HNO 3溶液中的行为是开发快速可靠的At分离和纯化系统的关键一步。所有树脂的分配系数均大于20，而TRU树脂和UTEVA树脂的分配系数均达到400。吸附量的大小顺序为：TRU-UTEVA> TK 400-SR > LN。对于每种树脂的热力学模型已被开发，建议在吸附和相应的吸附常数已估计的可能机制。综述了硝酸介质中树脂吸附铋的文献数据沿着和新结果，并提出了描述其行为的数学模型。分配给相同的树脂和酸度的相应的拟合函数的比例的At和Bi已被用来估计这些元素的分离因子。只有TRU树脂不适合于从Bi中有效分离At，而其他四种树脂表现出有希望的结果。
Systematic study of astatine (At) sorption on extraction chromatography resins from nitric acid media has been performed at Texas A&M University. This work covers commercially available resins such as LN, TK400, SR, TRU, and UTEVA. Acquiring an understanding of At behavior in up to 4 M HNO3solutions is a key step to develop a rapid and reliable system for At separation and purification. The determined distribution coefficients are greater than 20 for all the resins studied, reaching 400 for TRU and UTEVA resins. The sorption uptake decreases in the order: TRU ≳ UTEVA > TK400 ≳ SR > LN. For each resin a thermodynamic model has been developed to suggest a possible mechanism of At sorption and corresponding sorption constants have been estimated. Literature data along with new results on bismuth (Bi) sorption by studied 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 separation factors of these elements. Only the TRU resin is not suitable for efficient At isolation from Bi, while the other four resins demonstrate promising results.