loading page

Efficient extraction of gold from e-waste using functional guanidinium ionic liquids
  • Qing Liu,
  • Wanru Wang,
  • Kewen Tang
Qing Liu
Hunan Institute of Science and Technology
Author Profile
Wanru Wang
Hunan Institute of Science and Technology
Author Profile
Kewen Tang
Hunan Institute of Science and Technology

Corresponding Author:[email protected]

Author Profile


With the rapid development of modern industry, it is necessary to effectively recycle precious metals such as gold and palladium from e-waste. IL (ionic liquid) is an efficient extractant with high boiling points, non-flammability, and high thermal stability. The properties of IL can be improved by modifying the n-substituted groups of their cations, enhancing the separation efficiency of noble metals. Thus, two guanidinium ILs, with the substituents of -R and -OR, were synthesized to extract Au(III) from a hydrochloric acid medium. These ILs exhibited excellent extraction properties, including high selectivities, rapid kinetics, and significant extraction capacities. The maximum extraction capacities of Au(Ⅲ) by [diMTMG][Tf2N] and [diPTMG][Tf2N] were 519.4mg/g and 427.9mg/g, respectively, achieving rapid extraction equilibrium within 30s. The introduction of o-containing functional atoms enhanced extraction capacity and selectivity. The extraction mechanism involving anion exchange was confirmed by slope method, jobs method, as well as ultraviolet and nuclear magnetic resonance analysis.
07 Nov 2023Submitted to AIChE Journal
12 Nov 2023Assigned to Editor
12 Nov 2023Submission Checks Completed
12 Nov 2023Review(s) Completed, Editorial Evaluation Pending
18 Nov 2023Reviewer(s) Assigned