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本文研究磷酸三丁酯(TBP)和二苯基亚砜[(C_6H_5)_2SO]苯溶液在硝酸介质中对UO_2~(2+)的协同萃取,发现 BB类中性络合协萃体系有弱协萃效应。实验确定协萃络合物组成为 UO_2(NO_3)_2·TBP·(C_6H_5)_2SO,并求得协萃平衡常数吃1gβ_(12)= 0.446。分别研究了 TBP和(C_6H_5)_2SO单独萃取UO_2(NO_3)_2的反应,求出萃合常数1gβ_(10)和1gβ_(20),通过温度对分配比影响的测定,求得各反应的△H及 298K时的△G°和△S°值。本文还研究了(C_6H_5)_2SO加入 TBP后体系的辐照稳定性,测定了TBP+(C_6H_5)_2SO 降解产物的Hf指数。
In this paper, we studied the synergistic extraction of UO_2 ~ (2+) in nitric acid solution of tributyl phosphate (TBP) and diphenylsulfoxide [(C_6H_5) _2SO] benzene. Synergy effect. The results showed that the complex composition of the complex was UO_2 (NO_3) _2 · TBP · (C_6H_5) _2SO, and the equilibrium constant of the extract was 1gβ_ (12) = 0.446. The reaction of extraction of UO_2 (NO_3) _2 with TBP and (C_6H_5) _2SO was studied respectively, and the extraction constants 1gβ_ (10) and 1gβ_ (20) were calculated. The influence of temperature on the partitioning ratio was determined. And ΔG ° and ΔS ° values at 298K. In this paper, the radiation stability of (C_6H_5) _2SO added TBP system was also studied, and the Hf index of TBP + (C_6H_5) _2SO degradation product was determined.