Chemistry Letters, Vol.47, No.6, 732-735, 2018
Extraction Behavior of Lanthanides by a Novel Ionic Liquid Including N,N,N ',N '-Tetrakis(2-pyridylmethyl)-1,3-diaminopropane-2-amido Structure: A Soft-Hard Donor Combined Strategy
A novel hydrophobic ionic liquid including N,N,NW- tetrakis(2-pyridylmethyl)-1,3-diaminopropane-2-amido structures ((IL-TPTNA)+NTf2-) was successfully synthesized. Its extraction performance of Eu3+ from nitric acid solution was investigated by dissolving in a low viscosity ionic liquid (C(6)mim)+NTf2-. As a result, it was found that the extraction percentage of Eu3+ varied with the pH value. The stripping of extracted metals from (C(6)mim)+NTf2- into a receiving phase was successfully achieved under 1.0 M nitric acid conditions. Slope analysis confirmed that (IL-TPTNA)+NTf2- formed a 1:3 complex with Eu3+ in the (C(6)mim)+NTf2- system. Furthermore, (IL-TPTNA)+NTf2- showed greater preference to heavier lanthanides than lighter ones.