Evaluation of N,N,N′,N′-tetraoctyl-3-oxapentane-diamide (TODGA) as a mobile carrier in remediation of nuclear waste using supported liquid membrane

Studies on uranium(VI) pertraction across a N,N,N′N′-tetraoctyldiglycolamide (TODGA) supported liquid membrane

“…Out of these, membrane based methods are becoming increasingly popular [8][9][10][11], not only due to low ligand inventory, but also because of easy scaling up option employing hollow fiber supported liquid membranes [12][13][14][15] and alleviation of problems such as third phase formation and phase entrainment. We have been investigating the transport behaviour of trivalent actinide ions using supported liquid membranes containing TODGA [16,17]. However, the transport behaviour of tetra-and hexavalent actinides is not well understood.…”

“…As indicated, there is significant concentration of U in this waste. We have earlier reported the transport behaviour of Am 3+ ion in presence of macro-concentration of U using TODGA as the carrier extractant [17]. However, the transport behaviour of U alone is of significant interest due to its strategic importance and also due to the need to recover from lean sources.…”

Supported liquid membrane transport studies on Am(III), Pu(IV), U(VI) and Sr(II) using irradiated TODGA

“…Extraction and transport of trivalent Am(III) using TODGA as the carrier extractant has been reported in detail [20,22]. In one report, the role of absorbed dose on the Am(III) transport has been discussed, though not in a systematic way [20].…”

“…However, a significant amount of radiolytic degradation of the extractant is expected if liquid membrane based separation methods find applications in actual high level waste remediation. There is very limited information available in the literature on the transport behaviour of Am 3+ using irradiated TODGA [22] and no systematic study has been carried out so far. The role of the phase modifier such as DHOA (when present along with TODGA in the irradiated solvent) is also required to be understood.…”

Carrier-Facilitated Coupled Transport Through Liquid Membranes

“…Cotransport of opposite-charged ions is the most obvious way to maintain electroneutrality, but alternative means may be explored as additives to LM. In recent years, many studies have been conducted which examine the use of anionic membrane additives for maintenance of electroneutrality at cation transport [65,[84][85][86][87][88][89]. The anionic additives are typically lipophilic carboxylic, phosphoric, or sulfonic acids.…”