A cellulose triacetate (CTA)-based polymer inclusion membrane (PIM) containing a C-pivot tripodal diglycolamide (T-DGA) as the carrier extractant and 2-nitrophenyl octyl ether (NPOE) as the plasticizer shows potential for the uptake of actinides from acidic feed solutions. The uptake of actinides (Am3+, Pu4+, Th4+, UO22+) was studied at 1 M HNO3 with PIMs containing 25.6% T-DGA, 53.9% NPOE, and 20.5% CTA. The metal ion uptake followed the trend: Pu4+ > Am3+ > Th4+ > UO22+, which was in synch with the trend reported previously with PIMs containing N,N,N′,N′-tetrakis(2-ethylhexyl) diglycolamide (T2EHDGA) as the carrier. The sorbed actinide ion could be desorbed from the PIMs using a solution of α-hydroxy-iso-butyric acid (AHIBA). Transport studies carried out with 1 M HNO3 as the feed and 1 M AHIBA (at pH 3.0) as the receiver phase showed the trend: Am3+ > Pu4+ > Th4+ > UO22+, which was different than that observed from the uptake studies. Membrane stability was found to be reasonably good.
Mahanty, B., Mohapatra, P. K., Raut, D. R., Das, D. K., Behere, P. G., Afzal, M., & Verboom, W. (2016). Polymer Inclusion Membrane Containing a Tripodal Diglycolamide Ligand: Actinide Ion Uptake and Transport Studies. Industrial and engineering chemistry research, 55(7), 2202-2209. https://doi.org/10.1021/acs.iecr.5b04621