I&EC 170 |
| Development of appropriate methodologies for actinide-partitioning from high-level waste is one of the challenging areas of research for chemists. Two main processes developed for this purpose viz. TRUEX and DIAMEX are based on the use of CMPO (Octyl(phenyl))-N,N-diisobutylcarbamoylmethyl phosphine oxide) and DMDBTDMA (N,N,N',N' dimethyldibutyltetradecyl malonamide), respectively. Whereas CMPO has limitations with respect to inefficient backward extraction, DMDBTDMA is a poor extractant of An(III) under HLW conditions. A tridentate ligand, N,N,N',N'-tetraoctyl-3-oxapentanediamide (TODGA) has been proposed as a very powerful extractant of actinides from wide range of acidities (0.5–6 M HNO3). Though there are many publications on the solvent extraction as well as extraction chromatographic studies of trivalent actinides and lanthanides using TODGA as the extractant, there is no report involving membrane based transport studies of these ions. In the present studies transport behaviour of Am(III) was investigated by supported liquid membrane (SLM) using PTFE microporous membranes (0.45 µm pore size) impregnated with TODGA - n-dodecane as the carrier. The feed solution was 1-3 M HNO3 while the strip phase comprised of de-ionized water. |
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Separation of f-Elements, Sponsored by Separation Science and Technology Sub-Division
9:00 AM-12:00 PM, Thursday, 14 September 2006 Moscone Center -- Room 250, Oral
Division of Industrial & Engineering Chemistry |