Mechanistic study of trivalent europium transport through supported liquid membranes (SLMs) and a novel immobilized phase solvent extraction (IPSE) system

Harold Boerrigter*, Tanja Tomasberger, Arend S. Booij, Willem Verboom, David N. Reinhoudt*, Feike de Jong

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

As a new method of membrane formation, we have investigated microcellular foaming of thin (100 μm) polysulfone films containing varying trace concentrations of tetrahydrofuran using carbon dioxide as a physical blowing agent. Membrane morphologies were obtained by first saturating the polymer with carbon dioxide at 5 MPa, and subsequently heating the sample above the glass transition temperature (Tg) of the polymer/gas mixture at atmospheric pressure. The presence of tetrahydrofuran in the polymer at concentrations above 0.04 wt.% led to a transition from a closed cellular structure into novel open-cellular morphologies. The open structure manifests itself by small spot-like openings (diameters between 10 and 100 nm) in the cell walls. The mass transport resistances of the porous films were quantified using gas permeation measurements, and a Knudsen-type separation mechanism was observed. Detailed investigation showed that the transport resistance can mainly be controlled by two variables: (1) the concentration of the residual solvent in the polymer film, and (2) the foaming temperature. At optimal foaming temperatures, thin cell walls are obtained, which break up when fluctuations in the wall thickness are amplified by plasticizing solvent molecules.
Original languageEnglish
Pages (from-to)273-291
JournalJournal of membrane science
Volume165
Issue number2
DOIs
Publication statusPublished - 2000

Keywords

  • Extraction of cations
  • Cavitand-based carriers
  • Diffusion processes
  • Nuclear waste separations

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