Abstract
Many diamide-type extractants were synthesized and tested for the extraction of actinides (III), (IV), (V) and (VI) . The diglycolamides (DGA) with two amidic oxygen and one ether oxygen, which show the tridentate feature, have the high extractability of actinides (An) . In order to increase the lipophilic property, the diglycolamides with the different functional groups attached to N atoms were synthesized and examined for their extractability. It was found that N, N, N', N'- tetraoctyl-diglycolamide (TODGA) and N, N, N', N'- tetradecyl-diglycolamide (TDDGA) exhibit the satisfactory dissolution into n-dodecane with less solubility in H2O. The results of various metal extractions using TODGA revealed that the divalent, trivalent and tetravalent metals with ionic radius of 90-120 pm gave notably high D values. After elucidation of the effect on substitution of the functional group, the chemical form of DGA to have high performance on An extraction was proposed.
