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以 40 %辛醇 /煤油为稀释剂 ,研究了 3种荚醚 :N ,N ,N’ ,N’ 四丁基 3 氧 戊二酰胺(TBOPDA)、N ,N ,N’ ,N’ 四异丁基 3 氧 戊二酰胺 (TiBOPDA)和N ,N ,N’ ,N’ 四丁基 3,6 二氧 辛二酰胺 (TBDOODA)在硝酸介质中对Am(Ⅲ )和Eu(Ⅲ )的萃取热力学。TBOPDA、TiBOPDA和TBDOODA萃取镅的反应焓变分别为 :- 80 5 4、- 81 99和 - 75 88kJ/mol;求出了萃取反应自由能和熵值的变化 ;观测了不同平衡酸度下萃入有机相中金属离子的可见吸收光谱。研究结果表明 ,水相酸度在一定范围内变化时 ,有机相中金属离子的吸收峰位置和形状没有改变 ,说明萃取机理在一定酸度内不变。萃合物红外光谱的测量结果表明 ,萃取金属离子后 ,3种荚醚的羰基吸收峰均发生了显著位移 ,TBOPDA和TBDOODA的醚氧键位移分别为 6cm- 1和 3cm- 1。
Three kinds of pods ether, N, N, N ’, N’ tetrabutyl 3 oxalic diamide (TBOPDA), N, N, N ’, N’ Extraction of Am (Ⅲ) and Eu (Ⅲ) in Nitric Acid with TiBOPDA and N, N, N ’, N’ Tetrabutyl 3,6 Dioxooctanediamide (TBDOODA) Thermodynamics. The enthalpy changes of TBOPDA, TiBOPDA and TBDOODA extraction were: -80 5 4, -81 99 and -75 88 kJ / mol respectively; The free energy and entropy change of the extraction reaction were calculated; Visible absorption spectra of metal ions in organic phase. The results show that when the aqueous acidity changes within a certain range, the position and shape of the absorption peak of metal ions in the organic phase have not changed, indicating that the extraction mechanism does not change within a certain acidity. The infrared spectra of the complexes showed that the carbonyl absorption peaks of the three kinds of podders all shifted significantly after the metal ions were extracted. The ether-oxygen bonds of TBOPDA and TBDOODA were 6cm-1 and 3cm-1, respectively.