Issue 2, 2020

Behavior, mechanism and equilibrium studies of Au(iii) extraction with an ionic liquid [C4-6-C4BIm]Br2

Abstract

The first gemini-type benzimidazole ionic liquid ([C4-6-C4BIm]Br2) with two sites of action was synthesized and applied for gold extraction. The effects of [C4-6-C4BIm]Br2 concentration, initial gold(III) concentration, acidity, and the loading capacity of [C4-6-C4BIm]Br2 were examined in detail. It was found that [C4-6-C4BIm]Br2 has excellent extraction ability for obtaining high purity gold. The anion exchange mechanism between [C4-6-C4BIm]Br2 and Au(III) was proved by Job's method and 1H NMR and FTIR spectroscopy. Quantum chemical calculations were carried out to prove the mechanism theoretically. The extraction equilibrium process was modeled using Langmuir and Freundlich isotherms. Thermodynamic parameters ΔH, ΔG and ΔS indicated that the extraction process was exothermic and spontaneous. The pseudo-second-order kinetic model well fitted the experimental data (R = 0.99). In addition, [C4-6-C4BIm]Br2 has high selectivity for Au(III) compared to other base metals. In summary, [C4-6-C4BIm]Br2 has great application prospects in industry due to its excellent characteristics such as low cost, easy availability, and high extraction capacity.

Graphical abstract: Behavior, mechanism and equilibrium studies of Au(iii) extraction with an ionic liquid [C4-6-C4BIm]Br2

Article information

Article type
Paper
Submitted
30 Sept. 2019
Accepted
05 Dec. 2019
First published
09 Dec. 2019

Dalton Trans., 2020,49, 504-510

Behavior, mechanism and equilibrium studies of Au(III) extraction with an ionic liquid [C4-6-C4BIm]Br2

H. Su, Q. Wang, N. Wang and Y. Yang, Dalton Trans., 2020, 49, 504 DOI: 10.1039/C9DT03860D

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