Synergistic Aqueous Biphasic Systems: A New Paradigm for the "One-Pot" Hydrometallurgical Recovery of Critical Metals
authors Schaeffer, N; Gras, M; Passos, H; Mogilireddy, V; Mendonca, CMN; Pereira, E; Chainet, E; Billard, I; Coutinho, JAP; Papaiconomou, N
nationality International
journal ACS SUSTAINABLE CHEMISTRY & ENGINEERING
author keywords Acidic aqueous biphasic systems; Critical metals; Ionic liquids; Waste electrical and electronic equipment; Electra deposition
keywords IONIC LIQUIDS; SOLVENT-EXTRACTION; NICKEL; COBALT; ELECTRODEPOSITION; CHLORIDE; SEPARATION; WASTE; WATER
abstract An acidic aqueous biphasic system (AcABS), in which the inorganic salt component of a traditional aqueous biphasic system (ABS) is replaced by the inorganic acid inherently present in typical hydrometallurgical leachate solution, is shown to selectively separate cobalt from nickel, a separation relevant to the recycling of nickel metal hydride (NiMH) batteries. To overcome the limitation of electrodeposition in the presence of high acid concentration, a mixed ABS- AcABS approach is developed in which HCl is partially substituted by addition of a predictable amount of NaCl. This synergistic ABS-AcABS retains the metal extraction efficiency of AcABS while diminishing the acid concentration required to induce phase separation as well as its distribution to the ionic-liquid-rich phase. Selective deposition of cobalt in the presence of coextracted manganese impurities was achieved in AcABS, ABS, and ABS-AcABSs. The morphology and composition of the obtained deposits as well as the Faradaic efficiency of the process can be altered by varying the NaCl to HCl ratio and water content, resulting in highly tailored cobalt deposits. These results highlight the potential of AcABS-derived systems as a new extraction-separation platform for the integrated hydrometallurgical treatment of critical metals, from leaching to electrodeposition.
publisher AMER CHEMICAL SOC
issn 2168-0485
year published 2019
volume 7
issue 1
beginning page 1769
ending page 1777
digital object identifier (doi) 10.1021/acssuschemeng.8b05754
web of science category Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Engineering, Chemical
subject category Chemistry; Science & Technology - Other Topics; Engineering
unique article identifier WOS:000455288800188
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journal impact factor 6.140
5 year journal impact factor 6.415
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