Aliquat-336 impregnated chitosan microspheres for Au(I) extraction from thiosulfate solution: Preparation, adsorption mechanism, and application

Wang, Haiwen; Hu, Xianzhi; Zi, Futing; Chen, Shuliang; Chen, Yunlong; Zhao, Li

doi:10.1016/j.molliq.2023.122357

Cited by 2 publications

(2 citation statements)

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“…9 Nevertheless, the gold recovery from thiosulfate leachate remains a challenge because of the poor affinity of the activated carbon for Au(S 2 O 3 ) 2 3− anions, which hinders the application of the well-established carbon-in-leach (CIL) technique in cyanidation. 10 To date, attempts have been made to recover gold in leached thiosulfate solutions using a variety of techniques, including cementation, 11 functionalized activated carbon adsorption, 12 ion exchange, 13 solvent extraction, 14 and mesoporous silica adsorption. 15 Among them, solvent extraction has high selectivity, simple process, and low cost and is a suitable method for gold recovery from thiosulfate leaching solution.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For example, wang et al investigated the leaching behavior of thiosulfate on carbonaceous gold ores and found that the gold extraction rate in Cu 2+ –NH 3 –S 2 O 3 2– leach solution could reach 90% after the ore was roasted in a microwave oven at 500 °C for 30 min . Nevertheless, the gold recovery from thiosulfate leachate remains a challenge because of the poor affinity of the activated carbon for Au(S 2 O 3 ) 2 3– anions, which hinders the application of the well-established carbon-in-leach (CIL) technique in cyanidation . To date, attempts have been made to recover gold in leached thiosulfate solutions using a variety of techniques, including cementation, functionalized activated carbon adsorption, ion exchange, solvent extraction, and mesoporous silica adsorption .…”

Section: Introductionmentioning

confidence: 99%

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Green Aqueous Two-Phase Systems Constructed by Guanidinium Ionic Liquid for Efficient Recovery of Gold(I) from Thiosulfate Solution

Ma,

Chen,

Qiu

et al. 2024

ACS Sustainable Chem. Eng.

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Although thiosulfate leaching is a more sustainable alternative to the toxic cyanidation process for gold extraction, recovering Au(I) from pregnant thiosulfate solutions remains a significant challenge. In this study, novel aqueous two-phase systems (ATPSs) were constructed using green guanidinium ionic liquids (GILs) and inorganic salts for recycling gold thiosulfate from weak alkaline solutions. Key parameters including salt type, salt content, GIL content, extraction time, equilibrium pH, and initial Au(I) concentration were extensively explored. The extraction efficiencies of Au(I) reached 95.8% for [C 3 -Gun]Cl, 96.5% for [C 4 -Gun]Cl, and 97.7% for [C 5 -Gun]Cl system under optimal conditions. Spectral analysis and density functional theory calculations reveal that the main mechanism for Au(I) extraction is that Au(S 2 O 3 ) 2 3− anions replace Cl − anions in GILs, which then interact with guanidinium cations through electrostatic force. In addition, KSCN solution can efficiently strip gold thiosulfate with an efficiency of more than 99% and regenerate the GIL-rich phase simultaneously. The results of five extraction/stripping cycles showed that the extraction efficiency of Au(I) decreased slightly from 98.0 to 90.4%, while the stripping percentage decreased slightly from 99.7 to 92.3%, confirming that GIL-ATPS has excellent cycling performance. These results demonstrate that green ATPSs consisting of GILs provide a sustainable and efficient approach to gold recovery from thiosulfate solutions.

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