Americium pertraction across supported liquid membranes containing multiple diglycolamide ligands: Role of alkyl substitution and spacer length in carrier ligands

Bholanath Mahanty, Prasanta Kumar Mohapatra*, Andrea Leoncini, Jurriaan Huskens, Willem Verboom

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

Liquid–liquid extraction and subsequent supported liquid membrane (SLM) transport studies involving Am3+ ion were carried out from nitric acid feed solutions using three N-pivot tripodal diglycolamide (DGA) ligands with varying substituent at the inner carboxamide N atom and spacer length. The ligand with an isopropyl substituent and with C2 spacer is termed as iPr3-TREN-DGA, while the one without alkyl substituent is termed as TREN-DGA. The third ligand with no substituent but a C3 spacer is termed as TRPN-DGA. The trend of metal ion extraction was iPr3-TREN-DGA > TRPN-DGA > TREN-DGA when solutions of ca. 1.0 × 10−3 M ligand in 95% n-dodecane + 5% isodecanol were used. Stripping studies were carried out using 0.01 M HNO3, 0.01 M EDTA (at pH 3.0) and 1 M α-HIBA (α-hydroxyisobutyric acid) The extraction and stripping kinetics studies suggested attainment of equilibrium in about 30 minutes. The SLM studies were carried out in a two-compartment cell with 20 mL feed as well as receiver phase volumes and PTFE (polytetrafluoroethylene) flat sheets as the solid support. The transport rates followed the same trend as that of the metal ion extraction study, suggesting comparable diffusion coefficients of the complexes (obtained by the lag-time method). Membrane stability studies indicated the best stability for the TRPN-DGA ligand.

Original languageEnglish
Pages (from-to)170-178
Number of pages9
JournalChemical Engineering Research and Design
Volume159
DOIs
Publication statusPublished - Jul 2020

Keywords

  • Americium(III)
  • Extraction
  • Separation
  • Supported liquid membrane
  • Tripodal diglycolamide

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