The recovery and selective extraction of gold and platinum by novel ionic liquids

Abstract : Ionic liquids bearing tetrahexylammonium and tetraoctylammonium cations and halide (Br−), dicyanamide (Dca−), thiocyanato (SCN−) and bis(trifluoromethysulfonyl)imide (Tf2N−) by liquid–liquid extraction were studied on Au(III), Pt(II) and Pt(IV) extraction. All the system show excellent extractability of Au(III). It is the same for Pt(II) and Pt(IV) except for Tf2N− based ionic liquids which do not extract Pt(II) and Pt(IV) and constitute selective system for the separation of Au and Pt from aqueous effluents. The influence of acid concentration on extraction yield is evaluated. The anion-exchange mechanism of Au(III), Pt(II) and Pt(IV) was confirmed. Reductive stripping was used for the recovery of Au(III) and Pt(IV). Tf2N− based ionic liquids show an excellent recovery of Au(III) using thiourea as back-extractant.
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https://hal.univ-reims.fr/hal-01889370
Contributor : Aminou Mohamadou <>
Submitted on : Saturday, October 6, 2018 - 1:33:31 PM
Last modification on : Thursday, December 12, 2019 - 10:46:59 AM

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Stéphanie Boudesocque, Aminou Mohamadou, Alexandra Conreux, Béatrice Marin, Laurent Dupont. The recovery and selective extraction of gold and platinum by novel ionic liquids. Separation and Purification Technology, Elsevier, 2019, 210, pp.824 - 834. ⟨10.1016/j.seppur.2018.09.002⟩. ⟨hal-01889370⟩

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