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Pertraction of Np(IV) across a PTFE membrane containing two different aza-crown ether-based multiple diglycolamide (DGA) ligands termed as  LI(3 DGA arms) or  LII(4 DGA arms) was investigated using nitric acid as feed solution. A few of the studies were also carried out with Pu(IV) for comparison purposes. The kinetics of the extraction of Np(IV) and Pu(IV) was fast at 3 M HNO 3  and within 10 min reaches the equilibrium distribution ( D ) ratio with both ligands. However, the stripping kinetics was slower especially with ligand  LII. The extraction and transport studies were carried out using 1.0 × 10 −3  M ligand solution in 95%  n -dodecane + 5% isodecanol. The transport rates were slower with ligand  LIIthan with  LIat higher nitric acid concentrations (&gt;1 M HNO 3 ) and the transport rates decreased with nitric acid concentration with both ligands. The effective diffusion coefficients ( Deff ) of Np(IV) were estimated using the lag-time method as 6.2 × 10 −8  cm 2  s −1  ( LI) and 4.6 × 10 −8  cm 2  s −1  ( LII). The stability data suggest that the  LIcontaining supported liquid membrane (SLM) is comparatively more stable than that of  LIIand the transport flux remains the same up to nine days of operation in case of ligand  LI.

solvent extraction and ion exchange

Highly Efficient Pertraction of Tetravalent Neptunium Ions Across a Flat Sheet Supported Liquid Membrane Containing Two Different Aza-Crown Ether-Based Multiple Diglycolamide Ligands