Spectrophotometric Analysis of Ternary Uranyl Systems to Replace Tri-N-butyl Phosphate (TBP) in Used Fuel Reprocessing

Spectrophotometric Analysis of Ternary Uranyl Systems to Replace Tri-N-butyl Phosphate (TBP) in Used Fuel Reprocessing
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在废旧燃料再处理中替代磷酸三正丁酯 (TBP) 的三元铀酰体系的分光光度分析

DOI:
10.1007/s10953-019-00942-7
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发表时间:
2020
影响因子:
1.2
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中科院分区:
化学4区
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In this report, the interaction of monoamide/diamide and monoamide/diglycolamide mixtures withare investigated in pH = 1 methanolic nitric acid media. These monoamides includeN,N-dimethylacetamide (DMAA),N,N-diethylacetamide (DEAA),N,N-dibutylacetamide (DBAA) andN,N-dibutylbutanamide (DBBA).N,N,N′N′-tetraethylmalonamide (TEMA) andN,N,N′,N′-tetraethyldiglycolamide (TEDGA), which were chosen as model diamides and diglycolamides, respectively. Complex stability constants for each ligand were modelled using the Stability Quotients Using Absorbance Data program using UV–visible data. Complex stoichiometry of ligand mixtures was determined using Job plots and UV–Vis spectrometry. Monoamides were confirmed to produce only disolvate complexes within solution. The log10(K) values for monoamides were found to be independent of amine-side chain length, but were slightly dependent on the carbonyl-side chain length. TEDGA was found to produce multiple uranyl complexes in solution. Job plot data indicated that the uranyl cation strongly prefers to bond either only with the monoamide or diamide in ternary monoamide–diamide–UO2systems. Monoamide–diglycolamide–UO2systems were more complicated, with Job plot data indicating the potential for multiple ternary species being present is dependent on the monoamide structure.
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