Synthesis of Mono- and Di-ionic Liquids for Extraction of Pb(II) & Co(II) from Waste water

Abstract

Two Glycolamide based functionalized ionic liquids having imidazolium cations namely LI (mono-ionic) and LII (di-ionic) were synthesized for the extraction of Pb(II) and Co(II) from waste water. The synthesized ligands were characterized by FTIR and 1H NMR spectroscopy. The extraction efficiency of both mono- and di-ionic liquid was evaluated in terms of contact time, pH of the aqueous phase and metal ion concentration. The metal extraction was performed at pH range of 2, 4, 6, 8 and 10 whereas, at contact time of 15, 30, 45, 60 and 75 mins. The optimized pH of 4 and equilibration time of 75 mins was further utilized for extraction at various metal ions concentration (50, 100, 150, 200 and 250 ppm). LI exhibited low equilibration time as compared to LII whereas, both ligand showed maximum extraction at a pH of 4. A very high extraction efficiency of upto 99% for both metals was observed with LI and LII under optimized conditions.