Separation of cobalt and nickel using a thermomorphic ionic-liquid-based aqueous biphasic system

Abstract

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.

Ionic‐Liquid‐Based Acidic Aqueous Biphasic Systems for Simultaneous Leaching and Extraction of Metallic Ions

“…These systems are based on hydrophilic ILs that, once mixed with a specific inorganic salt in water, yield the formation of two immiscible aqueous phases—a salt‐rich and an IL‐rich phase, respectively. Few IL‐ABS were previously applied to metal ion extraction due to their limited stability at the low pH required to prevent metal hydrolysis . In addition, in any metal extraction process, acids are used to leach the metal from ores or waste devices.…”

“…Onghena et al . reported the formation of ABS using [P 44414 ][Cl] and NaCl and their application to the separation of cobalt from nickel.…”

Ionic‐Liquid‐Based Acidic Aqueous Biphasic Systems for Simultaneous Leaching and Extraction of Metallic Ions

“…[10,11] Another type of extracting systems,s o-called ionic-liquid-based aqueous biphasic systems (IL-ABS) have been used in the last decade for extracting neutral compounds from an aqueous phase. [16] In addition, in any metal extraction process,a cids are used to leach the metal from ores or waste devices. [16] In addition, in any metal extraction process,a cids are used to leach the metal from ores or waste devices.…”

“…Onghena et al [16] reported the formation of ABS using [P 44414 ][Cl] and NaCl and their application to the separation of cobalt from nickel. Ac omparison of the phase diagrams for these systems (compare Figure S2) [20] while the proposed AcABS allows for the direct "one-pot" extraction of metals from leachates.…”

“…[12][13][14][15] These systems are based on hydrophilic ILs that, once mixed with as pecific inorganic salt in water,y ield the formation of two immiscible aqueous phases-a salt-rich and an IL-rich phase,r espectively.F ew IL-ABS were previously applied to metal ion extraction due to their limited stability at the low pH required to prevent metal hydrolysis. [16] In addition, in any metal extraction process,a cids are used to leach the metal from ores or waste devices.…”