A [P44414][Cl]–NaCl–H2O ionic liquid-based aqueous biphasic system shows promising results for the separation of cobalt(II) and nickel(II) by homogeneous liquid–liquid extraction. The extracting phase consists of a hydrophilic ionic liquid that is salted-out by sodium chloride, indicating that there is no need for using hydrophobic ionic liquids.
B. Onghena, T. Opsomer and K. Binnemans, Chem. Commun., 2015, 51, 15932 DOI: 10.1039/C5CC06595J
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