Affordable Access

Publisher Website

Comparative evaluation of actinide ion uptake by polymer inclusion membranes containing TODGA as the carrier extractant

Authors
Journal
Journal of Hazardous Materials
0304-3894
Publisher
Elsevier
Publication Date
Volume
275
Identifiers
DOI: 10.1016/j.jhazmat.2014.04.059
Keywords
  • Todga
  • Diglycolamide
  • Actinides
  • Polymer Inclusion Membrane

Abstract

Abstract Polymer inclusion membranes (PIM) containing TODGA (N,N,N′,N′-tetra-n-octyl diglycolamide) were evaluated for the separation of actinide ions such as Am3+, Pu4+, UO22+ and Th4+ from acidic feeds. The PIMs were prepared using cellulose triacetate (CTA) as the polymer matrix and 2-nitrophenyloctyl ether (NPOE) as the plasticizer along with the diglycolamide carrier extractants and were characterized by conventional techniques such as XRD, thermal analysis and AFM. The PIM composition was optimized by a series of studies which involved variation in the CTA, NPOE and carrier concentration which suggested 58% TODGA, 30% NPOE and 12% CTA to be optimum. The uptake studies were carried out using feed solutions containing varying concentrations of nitric acid and showed the trend: Am3+>Pu4+>Th4+>UO22+. Transport studies were carried out in a two-compartment cell where nitric acid concentration the feed was varied (1–3M) while the receiver compartment contained alpha-hydroxy-iso-butyric acid (AHIBA). The actinide ion transport efficiencies with TODGA containing PIMs followed the same trend as seen in the uptake studies. The AFM patterns of the PIMs changed when loaded with Eu3+ carrier (used as a surrogate for Am3+) while the regenerated membranes have displayed comparable morphologies. Diffusion coefficient values were experimentally obtained from the transport studies and were found to be 8.89×10−8cm2/s for Am3+ transport.

There are no comments yet on this publication. Be the first to share your thoughts.