Extraction and Separation of Co2+ from Ni2+ Using the Novel Task-Specific Ionic Liquids of [C4H9NH3][P507]

Abstract Novel task-specific ionic liquids of [C 4 H 9 NH 3 ][P507], [C 6 H 13 NH 3 ][P507], [C 8 H 17 NH 3 ][P507], [C 10 H 21 NH 3 ][P507] and [C 12 H 25 NH 3 ][P507] were synthesized by one-step reaction. The 1 H NMR, 13 C NMR, FT-IR and mass spectra (MS) of the novel task-specific ionic liquids s were studied for analysis of their purities. The [C 4 H 9 NH 3 ][P507] has better performance of selective separation of Co 2+ from Ni 2+ in simulated sulfate solution due to the smaller different value between the radius of Co 2+ and the radius of [C 4 H 9 NH 3 ] + . The separation factor of Co 2+ from Ni 2+ was 522 using the three-stage cross flow extraction. A cleaner separation of Co 2+ from simulated solution containing 14 and 25 g/L of Co 2+ and Ni 2+ , respectively, was achieved using this process due to the unique properties of [C 4 H 9 NH 3 ] [P507].