Extraction of actinides using N, N, N′, N′-tetraoctyl diglycolamide (TODGA): a thermodynamic study

Abstract

SummaryThe effect of temperature on the extraction behaviour of Am(III), Pu(IV) and U(VI) from nitric acid medium was studied employing

Anionic alkyl diglycoldiamides with covalently bonded cobalt bis(dicarbollide)(1−) ions for lanthanide and actinide extractions

“…In the case of TODGA, the extractability increases with increasing HNO 3 concentrations. This can be attributed to co-extraction of NO À 3 ion together with lanthanide/actinide cation, and therefore the effective extraction is achieved only under highly acidic conditions [11,12]. In opposite, the efficiency of extractants 1-4 with cobalt bis(dicarbollide) ions decreases with increased acidity, what seems to indicate mechanism based on ion-exchange.…”

“…The currently most studied processes are based on malonamides (DIAMEX process) [1][2][3][4][5] or (N,N-dialkyl-carbamoylmethyl)-dialkyl phosphine oxides (CMPO) (TRUEX process) [5][6][7][8][9][10] as the organic ionophores. More recently, another efficient extractant, N,N,N 0 ,N 0 -tetra(n-octyl)-3-oxapentane-1,5-diamide (tetra-n-octyl-diglycolamide, TODGA) [11,12], has appeared among them to attain great attention due to good efficiency and high stability (ARTIST process). All these organic ionophores are able to bind tightly the M 3+ cations in chelate complexes by donor atoms of the uncharged ligand.…”

Thermodynamics, Optical Properties, and Coordination Modes of Np(V) with Dipicolinic Acid

“…[4][5][6][7][8][9][10] The amide ligands consist of only C, H, O and N atoms so that they are completely incinerable. As a result, the amount of solid radioactive wastes generated in the amide-based processes could be significantly reduced.…”

Extractants for rare earth metals

“…Another example of the synthesis of selective extractants based on calix [4] arene to separate actinides from lanthanides has been described by Ansari and employees [24,25]. They received the series of pyrazine-substituted calixarenes 37-39 and examined their efficiency for the extraction of the cation Eu 3+ from an aqueous solution of nitric acid.…”

“…Еще один пример синтеза селек-тивных экстрагентов на основе ка-ликс [4]арена для разделения актинои-дов от лантаноидов был описан Ansari и сотрудниками [24,25]. Они получи-ли серию пиразин-замещенных калик-саренов 37-39 и изучили их эффектив-ность для экстракции катиона Eu 3+ из водного раствора азотной кислоты.…”