Study on the Extraction of Technetium With Amido Podand
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摘要: 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HNO3 介质中对TcO- 4的萃取行为, 稀释剂为 4 0 %辛醇 煤油。萃取过程为一放热反应。萃取反应式为H++TcO- 4+nSHTcO4 ·iS(式中S表示萃取剂 )。在酸度为 0 5、2 0、4 0mol/L时, 对TBOPDA和TiBOPDA, i分别为 2、1 5和 1 0 而对TBDOODA, 则在 3种酸度下均为i=1 0。对 0 1mol·L- 1TBOPDA、0 2mol·L- 1TiBOPDA和 0 1mol·L- 1TBDOODA, 2 5℃下测得的反应表观平衡常数分别为 18 5、19 2和 4 9,同时测出了它们对Tc(Ⅶ )的萃取反应热力学函数值。Abstract: By using n octanol and kerosen as diluent, the extraction behavior of technetium from nitric acid solution is studied with N,N,N'N' tetrabutyl 3 oxa pentanediamide(TBOPDA),N,N,N'N' tetraisobutyl 3 oxa pentanediamide(TiBOPDA) and N,N,N'N' tetrabutyl 3,6 dioxa octanediamide(TBDOODA). The extraction equilibrium is an exothermic reaction. The composition of the extraction complex and the extraction mechanism are also examined. The extraction reaction is H ++TcO - 4+ i SHTcO 4· i S(S is extractant). When the concentration of nitric acid is 0.5,2.0 and 4.0 mol/L, i equals 2, 1 5 and 1 0, respectively for both TBOPDA and TiBOPDA; whereas i equals 1.0 for TBDOODA in above three nitric acid solutions. At 25 ℃ and c (HNO 3)=2 0 mol/L, the apparent extraction constant K ex is 18 5, 19 2 and 4 9 for TBOPDA (0 1 mol/L), TiBOPDA(0 2 mol/L) and TBDOODA (0 1 mol/L), respectively. The change of thermodynamic functions of extraction reaction, Δ H, Δ S and Δ G are measured or calculated.
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Keywords:
- amido podand ,
- extraction ,
- technetium
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