Polymer Inclusion Membrane Containing a Tripodal Diglycolamide Ligand: Actinide Ion Uptake and Transport Studies

Abstract

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 (Am 3+ , Pu 4+ , Th 4+ , UO 2 2+ ) was studied at 1 M HNO 3 with PIMs containing 25.6% T-DGA, 53.9% NPOE, and 20.5% CTA. The metal ion uptake followed the trend: Pu 4+ > Am 3+ > Th 4+ > UO 2 2+ , 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 HNO 3 as the feed and 1 M AHIBA (at pH 3.0) as the receiver phase showed the trend: Am 3+ > Pu 4+ > Th 4+ > UO 2 2+ , which was different than that observed from the uptake studies. Membrane stability was found to be reasonably good.

Crosslinking improved ion transport in polymer inclusion membrane‐electrodialysis process and the underlying mechanism

“…In PIM process, both “fixed‐site jumping” and “carrier‐diffusion” mechanisms have been found previously 35,36 . The Cr(VI) transport by PIM through mechanism of mobile carrier diffusion is in a neutral carrier‐metal ion‐pair form, and the transport of Cr(VI) through this mechanism could not be dramatically sped up by the electric field.…”

Waste Conversion and Resource Recovery from Wastewater by Ion Exchange Membranes: State-of-the-Art and Perspective

“…PIMs are usually composed of carrier (molecular or ionic liquid), a base polymer, and a plasticizer or modifier. The carrier encapsulated in the polymeric structure is responsible for selectively binding with the target chemical species while the base polymer provides the mechanical strength of the membrane. , …”

Highly Promising Method for the Decontamination of Europium from Americium Using an Extraction Chromatography Resin Containing a Tripodal Diglycolamide and SO3Ph-BTP as Eluent

“…One such example of multiple DGA ligands is the tripodal DGA (T-DGA, Figure ) where three units of DGA are appended onto the central carbon atom . The T-DGA ligand shows several folds better extraction efficiency from the trivalent actinides (e.g., Am) when compared with its conventional counterpart TODGA ( N , N , N ′, N ′-tetra- n -octyl diglycolamide). – However, like any other actinide-extracting ligand, T-DGA cannot significantly differentiate between the trivalent actinides and lanthanides, and as a result, both lanthanides and actinides are extracted together, to a large extent . In order to separate the actinides from the lanthanides, for instance, mutual separation of Am 3+ and Eu 3+ in this case, a selective ligand is needed which can differentiate among the two.…”