Design and synthesis of a novel soft-hard donor ligand for solvent extraction of Th(IV) from nitric acid media

作者：Li, Long; Ding, Jie; Xiao, Fengfeng; Wu, Rulei; Huang, Yalin; Pan, Ning^*; Jin, Yongdong^*; Xia, Chuanqin^*

来源：Journal of Radioanalytical and Nuclear Chemistry, 2017, 312(3): 655-662.

DOI：10.1007/s10967-017-5263-5

• Soft-hard ligand
• Amide compound
• Solvent extraction
• Thorium separation
• Selectivity for thorium

A novel hard-soft donor ligand 2,2 ',2 '',2 '''-(((ethane-1,2-diylbis(azanediyl))bis(2-oxoethane-2,1-diyl))bis(azanetriyl))tetrakis(N,N-dibutylacetamide) (L), containing eight nitrogen atoms and six oxygen atoms, was rationally designed and synthesized for the extraction of Th(IV) from nitric acid solution. Solvent extraction studies including the effects of extraction time, acidity, nitrate ions, temperature, the concentration of ligand L, mixed ions and stripping agents on extraction behavior of Th(IV) were carried out. The results show that L exhibits higher extraction efficiency for Th(IV) than those of U(VI) over a wide range of HNO3 concentrations. Slope analysis indicates that Th(IV) is extracted as the extracted complex with a thorium/L ratio of 1:1. In addition, Th(IV) can be selectively extracted from mixed ions and easily stripped by using 2.0 mol/L Na2CO3 solution.

• 出版日期2017-6
• 单位西南科技大学; 四川大学