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Article Dans Une Revue Journal of Environmental Chemical Engineering Année : 2020

Selective Cobalt over Nickel separation using neat and confined ionic liquids

Résumé

Task Specific Ionic Liquids (TSILs) generated by association between tetraalkylammonium cations and coordinating anions such as dicyanamide (Dca-) and thiocyanate (SCN-) were used for the selective separation of Ni(II) over Co(II). SCN-based TSIL presents higher extraction efficiency than the Dca-based one towards Co(II) (E = 85.4 % vs 54.6 %) and Ni (II) (E = 22 % vs 0.5%) but lower separation factors (βCo/Ni = 21 vs 239). Interestingly, extraction of Co(II) and Ni(II) in Dca-based TSIL can be enhanced using salts with chaotropic anions such as NaNO3 (E > 90 % for Co(II) and E = 85% for Ni(II)). The use of NaCl allows, moreover, the efficient separation of both ions with βCo/Ni >1000. The metal can be recovered from the IL phase using Na2SO4 aqueous solution to limit the release of the IL and to ensure a good recyclability of this latter. The confinement of TSIL in silica –matrix ionogel constitutes a valuable method to improve the handling of the IL. Indeed, the extraction properties of the ionogel containing [THN][Dca] IL are very close to those obtained using the same neat IL with an efficient separation of Co(II) over Ni(II) in NaCl 4 mol.L-1 (βCo/Ni >1000). Finally, the recyclability of the ionogel was studied and found comparable to that of neat IL.

Domaines

Génie chimique
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Dates et versions

hal-02991527 , version 1 (06-11-2020)

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Stéphanie Boudesocque, Lydie Viau, Laurent Dupont. Selective Cobalt over Nickel separation using neat and confined ionic liquids. Journal of Environmental Chemical Engineering, 2020, 8 (5), pp.104319. ⟨10.1016/j.jece.2020.104319⟩. ⟨hal-02991527⟩
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