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We investigate the separation of Co 2+  and Ni 2+  from base metal ions Co 2+ , Ni 2+ , Mn 2+ , and Li +  ions using solvent extraction in chloroform medium. We also looked at the extraction within a larger pool of metal ions, Mn 2+ , Ni 2+ , Co 2+ , Cu 2+ , Zn 2+ , Cd 2+ , and Li + . Four new ligands were synthesized via a two-step bimolecular nucleophilic substitution and were characterized by conventional means. The ligands were subjected to solvent extraction of Co 2+ , competitive extraction using metal ions Co 2+ , Mn 2+ , Ni 2+ , and Li + , selectivity tests, loading tests, pH-extraction isotherms, time-dependence, and back extraction. Ligand  L4  was the best compared to the other ligands in single and competitive extraction. When considering the pool of metal ions, the percentage extraction of Cu 2+  increased as the concentration of ligand  L4  was increased. Furthermore, the extraction of Ni 2+  and Cu 2+  increases with increase of pH as expected. The selectivity changed toward Ni 2+  in most of the ligands when the concentration of Cu 2+  ion was reduced. Cu 2+  metal ions could be 80% back-extracted using 1 mol dm −3  nitric acid during a single stripping. The new extractants extracted Ni 2+  preferentially with a high selectivity over Mn 2+  and Co 2+  in the presence of these three metal ions. The synthesized ligands could perhaps be used in the future for the separation of Ni 2+  from a solution containing Mn 2+  and Co 2+ .

separation science and technology

The synthesis and use of new amic acid extractants for the selective extraction of Cu(II),Ni(II) and Co(II) from other base metal ions in acidic medium