Extraction Behaviors of Trivalent Lanthanides from Nitrate Medium by Selected Substituted Malonamides

摘要

The extraction of La(III),Pr(III),Nd(III) Sm(III),Eu(III),Gd(III) Tb(III),Dy(III),and Er(III) from nitrate medium by a series of structurally related malonamides (MA) diluted with toluene has been studied.The considered malonamides were synthesized with different substituting groups including alkyl,cyclohexyl,and oxyalkyl chains.This series allowed for a systematic determination of the effect of the structure on the extraction of trivalent lanthanides.Distribution ratios of the investigated metal ions have been determined as a function of nitric acid concentration,diluent type,extractant concentration and salting-out agent as well as temperature.The stoichiometries of the extracted species of La(III),Sm(III),Tb(III),and Er(III) were conformed to be tri-solvates.The extracted species were also studied using IR spectra.