Diglycolamide Based Mono and Di-Ionic Liquids Having Imidazolium Cation for Effective Extraction and Separation of Pb(II) and Co(II)

• Published in: Russian journal of inorganic chemistry Vol. 66; no. 7; pp. 1040 - 1046
• Main Authors: Waheed, K., Azra, N., Iqbal, M., Mehmood, T.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-07-2021; Springer Nature B.V
• Subjects: Balancing; Cations; Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Ion concentration; Ionic liquids; Ions; Lead; Ligands; Metal ions; NMR spectroscopy; Physical Chemistry of Solutions; Separation; Synthesis; Wastewater; imidazolium; ionic liquids; extraction; Pb(II) and Co(II); diglycolamide
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023621070147

Two glycolamide based functionalized ionic liquids (ILs) having imidazolium cations namely L
I
(mono-ionic) and L
II
(di-ionic) were synthesized for the extraction of Pb(II) and Co(II) from waste water. The synthesized ligands were characterized by FTIR and NMR spectroscopy. The extraction efficiency of both mono- and di-ionic liquids was evaluated in terms of contact time, pH of the aqueous phase and metal ion concentration. The metal extraction was carried out at various pH values viz
.
2, 4, 6, 8, and 10 whereas, at contact time of 15, 30, 45, 60, and 75 minutes. The optimized pH of 4 and equilibration time of 75 minutes was further utilized for extraction at various metal ions concentration (50, 100, 150, 200, and 250 ppm). L
I
exhibited low equilibration time as compared to L
II
whereas, both ligands showed maximum extraction at a pH of 4. A very high extraction efficiency of up to 99% for both metals was observed with L
I
and L
II
under optimized conditions. In addition to that effective separation of Co(II) and Pb(II) was observed at pH 10.