Extraction of Am(Ⅲ) and Eu(Ⅲ) from Nitric Acid Solution with the Pyridylpyrazole Based Ligand C8-BPP

doi:10.7503/cjcu20170027

Abstract

Abstract:

Pyridylpyrazole based ligand 2,6-bis[5-(n-octyl)-1H-pyrazol-3-yl] pyridine(C8-BPP) was synthesized and characterized by means of mass spectrometry(MS), nuclear magnetic resonance(NMR) spectrometry, and Fourier transform infrared spectrometry(FTIR). In the presence of 2-bromohexanoic acid, using n-dodecane as diluent, the extraction behaviors of Am³⁺ and Eu³⁺ with C8-BPP were investigated. Influences of diluent, contact time, acidity and the ligand concentration on the extraction of Am³⁺ and Eu³⁺ were evaluated in HNO₃ solution. The distribution ratio values of Am³⁺ and Eu³⁺ decreased with increasing HNO₃ concentration from 0.2 to 1.0 mol/L, and increased with increasing ligand concentration from 0.01 to 0.1 mol/L. With the increase of acidity, the separation factors(SF_Am/Eu) increased firstly and then decreased. The maximum value of SF_Am/Eu can reach 55 at 0.5 mol/L HNO₃. Meanwhile, SF_Am/Eu values decreased slowly with increasing the ligand concentration but all the SF_Am/Eu values were above 40. The extraction results also showed that C8-BPP exhibited good selective extraction ability for Am³⁺ over RE³⁺. Moreover, slope analyses indicated the formation of 1:1 complexes of C8-BPP with Am³⁺ and Eu³⁺, separately. Besides, the complexation behaviors of C8-BPP with Eu³⁺ were also investigated by means of UV-Vis spectrometry titration, electrospray ionization mass spectrometry(ESI-MS), FTIR, Raman spectrometry and time-resolved laser-induced fluorescence spectroscopy(TRLFS). The composition and stability constant(lgK) of the complex of C8-BPP with Eu³⁺ were also obtained.

Key words: Pyridylpyrazole based ligand, Solvent extraction, Americium, Europium, Separation

CLC Number:

O615.11

TrendMD:

HU Xiaoyang, SU Dongping, LI Shimeng, WANG Zhipeng, ZHANG Lirong, LIU Ying, SONG Lianjun, CHEN Zhili, DING Songdong. Extraction of Am(Ⅲ) and Eu(Ⅲ) from Nitric Acid Solution with the Pyridylpyrazole Based Ligand C8-BPP[J]. Chem. J. Chinese Universities, 2017, 38(8): 1324.

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