Unusual selective extraction of Pu 4+ by some novel diamide ligands in a room temperature ionic liquid

Selective extraction of trivalent actinides using CyMe4BTPhen in the ionic liquid Aliquat-336 nitrate

“…Such diluent mixtures of 1-octanol/toluene or 1-octanol/hydrogenated tetrapropylene (TPH) were tested by Lewis et al 17 Ionic liquids (ILs) are a relatively new class of compounds that can provide several advantages over molecular diluents in solvent extraction processes at the back-end of the nuclear fuel cycle. [27][28][29][30] ILs can be used as extractants, diluents or both, depending on the chosen conditions and metal ions to be separated. A main reason and driving force to consider ILs instead of classical organic diluents is their radiation stability.…”

Rhenium(VII) extraction from sulfuric aqueous solutions using ionic liquids as diluent and extractant: insights on the extraction stoichiometry and process parameters

“…The nuclear magnetic resonance (NMR) data are as follows: 1 H-NMR (400 MHz, CD 3 COCD 3 , ppm); 0.85-0.90 (m, 12H, 4CH 3 ); 1.20-1.40 (m, 44H, CH 2 ); 1.60-1.75 (m, 6H, 3CH 2 ); 3.34 (s, 3H, N-CH 3 ); 3.54-3.62 (m, 6H, 3 N-CH 2 ); 7.20-7.25 (m, 3H); 8.00-8.10 (m, 2H). 13 Figure 1 shows the molecular structure of the ionic liquid where the cation [TOMA] + exhibits long alkyl chains, which provide high hydrophobicity. Furthermore, as mentioned above, high-molecularweight amines can be considered good extractants for the perrhenate anion (ReO − 4 ) because they interact via hydrogen bonding association, 22 exhibiting high extraction capacity for this metal ion.…”

“…To demonstrate both whether the diluent is extracting Re(VII) to some extent, and, according to Eqn (13), there is a transfer of Tf 2 N ½ − ions to the aqueous phase, additional SX experiments were carried out dissolving the salt Li ½ Tf 2 N ½ in the aqueous phase.…”

“…This point is very important because the leaching process is carried out at high temperatures (around 40°C) and the IL would not volatilize during the SX and would show thermal stability. These are the reasons why ILs have been proposed in SX of various metal ions 11‐13 …”

“…These are the reasons why ILs have been proposed in SX of various metal ions. [11][12][13] Recent works have proposed ILs as extractants, where the most important achievement is that high extraction percentages were reported with only a small concentration of them in a diluent, 14,15 when compared to conventional extractants. In this sense, in previous works, the IL trioctylmethylammonium benzoate [TOMA][BA] has been introduced as an extractant, for Mo(VI) extraction, showing high extraction percentages (90-100%) at low pH values and with a small amount of this extractant (1% v/v).…”