Abstract:
Six succinamide based ionic liquids were synthesized with imidazolium, pyridinium, ester
imidazolium and quaternary amine based cations. These were termed as L1, L2, L3, L4,L5 and
L6. Techniques used for the characterization of these synthesized ionic liquids were FTIR and
NMR. The extraction efficiencies of Pb(II) Co(II) from aqueous phase was evaluated using
synthesized ionic liquids on varying pH values and at different contact time. Extraction and
separation efficiencies were also studied for Ni(II) and Co(II) by L1 and L3 in aqueous acidic
media before and after adding a modifier (TBP). Experiments were carried to optimize contact
time, initial pH of the aqueous phase and effect of TBP as a modifier on the extraction
efficiencies of ionic liquids. Maximum extraction was observed at higher pH values and
optimum contact time was observed to be 45 min.
TBP was not found a good modifier for the extractants as it decreased the extraction efficiency of
ionic liquid but separation between two metal ions was increased.
