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The aim of this project was to strongly decrease the volume of medium level wastes to be disposed of in geological formations by selectively removing the long lived radionuclides (actinides, 137-Cs, 90-Sr). Classical ion exchangers or extractants failed to reach this aim particularly for removal of cesium. This project was launched with two new classes of extractants: functionalized calixarenes and ionizable crown ethers. Among 143 macrocycles prepared, two classes of calixarenes were particularly promising: calixarenes bearing CMPO moieties are very effective for the removal of lanthanides and trivalent actinides and 1-3 dialkoxy calix[4]arenes crown 6 display an outstanding efficiency for the removal of cesium either from very acidic medium or from liquid waste containing large amounts of sodium. In addition, cesium complexing capabilities of these calixarenes were modelled by molecular mechanics.

Additional information

Authors: DOZOL J F, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);BÖHMER V, Johannes-Gutenberg Universität, Mainz (DE);MCKERVEY A, Queen's University Belfast (GB);LOPEZ CALAHORRA F, Universidad de Barcelona (ES);REINHOUDT D, Universiteit Twente (NL);SCHWING M J, EHIC Strasbourg (FR);UNGARO R, Università degli Studi di Parma (IT);WIPFF G, Université Louis Pasteur, Strasbourg (FR);BOHMER V, Johannes-Gutenberg Universitat, Mainz (DE)
Bibliographic Reference: EUR 17615 EN (1997) 189pp., FS, ECU 5.00
Availability: Available from the (2)
ISBN: ISBN 92-828-0208-6
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