不同稀释剂中N,N,N′,N′-四丁基-3-氧戊二酰胺从硝酸介质中萃取Gd(Ⅲ)离子的研究

Extraction of Gd(Ⅲ) with N, N, N′, N′-Tetrabutyl-3-oxa-diglycolamide in Different Diluents

在不同稀释剂体系中研究了N,N,N′,N′-四丁基-3-氧戊二酰胺(TBDGA)从硝酸介质中萃取Gd髥离子的性能及反应机理。考察了水相硝酸浓度、萃取剂浓度及温度对其萃取性能的影响。实验表明在不同稀释剂中TBDGA对Gd髥的萃取能力为:二甲苯>四氯化碳>甲苯>氯仿,分配比在所研究酸度范围内都随硝酸浓度的增加而增大。在不同稀释剂中萃取机理是相同的,萃合物的组成为Gd(NO3)3·3TBDGA;萃取Gd(Ⅲ)离子的反应为放热反应,低温有利于萃取。萃合物的IR光谱表明羰基氧与Gd(Ⅲ)发生配位。

The extraction performance and mechanism of Gd （Ⅲ） with N, N, N′, N′-tetrabutyl-3-oxa-diglycolamide （TBDGA） were studied in different diluents from nitric acid solution. The influence of nitric acid concentration, TBDGA and temperature on the extraction was investigated. The order of the extraction ability of TBDGA in various diluents is as follows： XyleneCCl4TolueneCHCl3. The extraction distribution ratio of Gd （Ⅲ） increases with the increase in the concentration of nitric acid. The same extraction mechanism is suggested in different working diluents and the extraction species is Gd （NO3）3·3TBDGA. The distribution ratio decreases with the increase in the temperature and the extraction reaction is exothermic. The IR spectra results of the extracted species indicate that the carbonyl oxygen of TBDGA is coordinated with Gd（Ⅲ）.