核化学与放射化学2011，Vol.33Issue(6)：328-334,7.
TODGA-DHOA体系从硝酸介质中萃取碱土金属
Extraction of Alkali Earth Metal Ions From Aqueous Nitric Acid Solutions With TODGA-DHOA in n-Dodecane
朱文彬 1叶国安 1李峰峰 1蒋德祥 1李会蓉1
作者信息
- 1. 中国原子能科学研究院放射化学研究所,北京102413
- 折叠
摘要
Abstract
A novel extraction reagent, N,N,N',N '-tetraoctyl diglycolamide(TODGA) was synthesized. The influence of various factors on the extraction of alkali earth metal from aqueous nitric acid solutions with this amide (L) and N, N-dihexyl-octamide (DHOA) is studied, including extractant concentration in n-dodecane, extracted ions concentration, acidity of aqueous phase, ionic strength of salting out agent and temperature. The composition of the extracted species and the mechanism of extraction were studied. The results suggest the extracted species to be M(NO3)2 · 2TODGA(org). The enthalpy change for the extraction of Ca ( II ), Sr (II ) and Ba ( II ) are ( - 38. 85 ± 1. 37) kJ/mol, ( - 24. 30 ± 1.45) kJ/mol and (-9.14±2. 01) kj/mol, respectively. The ehtropy change are (-78. 26± 2. 67) J/(mol· K), (-75. 80±4. 74) J/(mol·K) and (-51. 85±6. 11) J/(mol · K), and the Gibbs energy change are ( - 9. 88 ±0.06) kJ/mol, ( - 2.08±0.06) kj/mol and (6.06 ± 0. 22) kJ/mol at 293 K, respectively. No emulsification or third phase formation is observed during the extraction process. On the basis of the experiment results, the method of seperation and recovery of Sr from high-level liquid waste puts forward.关键词
TODGA/DHOA/溶剂萃取/碱土金属Key words
TODGA/ DHOA/ solvent extraction/ alkali earth metal分类
能源科技引用本文复制引用
朱文彬,叶国安,李峰峰,蒋德祥,李会蓉..TODGA-DHOA体系从硝酸介质中萃取碱土金属[J].核化学与放射化学,2011,33(6):328-334,7.
