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Extraction of trivalent americium and europium from nitric acid solution with a calixarene-based diglycolamide

Authors
  • Huang, Huang
  • Ding, Songdong
  • Liu, Ning
  • Wu, Yuxuan
  • Su, Dongping
  • Huang, Song1, 2, 3, 4, 5, 2
  • 1 College of Chemistry
  • 2 Sichuan University
  • 3 Key Laboratory of Radiation Physics and Technology
  • 4 Ministry of Education
  • 5 Institute of Nuclear Science and Technology
Type
Published Article
Journal
Separation and Purification Technology
Publisher
Elsevier
Publication Date
Jan 01, 2014
Accepted Date
Dec 28, 2013
Volume
123
Pages
235–240
Identifiers
DOI: 10.1016/j.seppur.2013.12.039
Source
Elsevier
Keywords
License
Unknown

Abstract

A ligand derived from calix[4]arene functionalized at the lower rim with four diglycolamide (DGA) binding units containing n-butyl groups, which is denoted as calix[4]arene-BDGA, was synthesized and characterized by MS, 1H NMR and 13C NMR. The extraction behaviors of Am(III) and Eu(III) from nitric acid solution were investigated with calix[4]arene-BDGA in 95% kerosene/5% n-octanol (v/v). Effects of acidity, concentration of extractant and temperature on the distribution ratio of Am(III) and Eu(III) were evaluated. The results indicated the distribution ratio values of Am(III) and Eu(III) increase with the increase of nitric acid concentration in the examination of acidity range from 0.5 to 5.0mol/L. The ligand has a higher selectivity for Eu(III) than for Am(III) with the separation factor SFEu(III)/Am(III) values of 4.5–7.3. Slope analysis from nitric acid medium indicated that Am(III) and Eu(III) were extracted as di-solvated species by calix[4]arene-BDGA. The extraction mechanism was described and the thermodynamic parameters (ΔH, ΔS and ΔG) were also presented.

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