Extraction of Actinides and Lanthanides from Nitric Acid Solution by Malonamides

Counterion specificity of surfactants based on dicarboxylic amino acids

“…Such interactions have been observed before for similar chelating agents and divalent cations [8,9]. Close packing of all three surfactants may also be favored by formation of hydrogen bonds between the amide linkages of surfactants aligned at the interface [26].…”

“…Interaction with monovalent cations was investigated in some detail and attempts were made to correlate the interaction with the self-aggregation behavior. The dicarboxylic surfactants are potential chelating agents for di-and trivalent cations [8,9] and it is likely that the mode of interaction between the ion and the surfactant polar headgroup varies with the distance between the carboxyl groups. This was studied using calcium as cation.…”

Advanced Extraction Methods for Actinide/Lanthanide Separations

“…There are many complex processes that influence the transfer of the metal ion from an acid layer into an organic phase, and in a very simplistic view, the three major factors dominate the extraction event: solubility, steric hindrance presented by a ligand, and the electronic effect. 62 The first tris-diglycolamide ligand with two isopropyl groups on the terminal amides (15) was found to be a highly effective agent for the extraction of the heaviest lanthanides into dichloromethane. With the desire to use more environmentally "friendly" solvents, the extraction profile was examined in 1-octanol and n-dodecane, but during the acidic extraction in n-dodecane, formed complexes quickly precipitated out of the organic solution.…”

Solvent Extraction of Various Metals Including Actinides by Bidentate and Tridentate Diamides

“…Many diamide extractants, i.e., malonamides, succinamide, glutalamide and adipamide, have been studied for the application to the recovery of An for the last two decades [1][2][3][4][5]. It is important to elucidate the effect on the structure of the diamide in order to investigate the best extractant for An.…”