Paired electrochemical recovery of metal ions from emulated e-waste leached solutions in an RCE electrochemical reactor

Barragan, Jose Angel; Larios-Durán, Erika Roxana; Peregrina-Lucano, Alejandro Aarón; Rivero, Eligio P.

doi:10.1016/j.electacta.2023.143419

Cited by 2 publications

(1 citation statement)

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“…Electrowinning is a common strategy for metal recovery after a hydrometallurgical treatment when the electrolyte contains a relatively high concentration of metal ions. Some researchers have reported that a rotation cylinder electrode could be used in an electrolysis process to enhance mass transport and diffusion of the metal ions. − Another advantage with electrochemical reduction is that one could potentially achieve selective recovery of certain elements based on working potential adjustment and, in some cases, predict the selectivity using the Pourbaix diagram. The redox potential of a metallic element can be predicted reasonably well via thermodynamic analysis, and the strategy has been demonstrated in an aqueous environment. , …”

Section: Introductionmentioning

confidence: 99%

Chemically Benign Electrometallurgical Treatment of Waste-Printed Circuit Board in Polyethylene Glycol for Metal Recovery

Liu,

Le,

Wang

et al. 2024

ACS Sustainable Resour. Manage.

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The rapid growth of the electronic industry and its high turnover product rate have promoted a surge in e-waste generation. An efficient recycling strategy to recover the metal content from e-waste is essential to developing a sustainable circular economy. Herein, we report a chemically benign and mild electrometallurgical approach to extract and recover the metallic content from real industrial e-waste at room temperature and atmospheric pressure in poly(ethylene glycol) (PEG), a chemically benign solvent commonly used for commodity and medical products. In this system, the metal content from e-waste is electrochemically oxidized to metal ions, which are then deposited in situ on the cathode in the same reaction cell. The reaction extracted over 11 metals from real e-waste samples with good Faradaic efficiency (FE), calculated from the deposited metal, scored as high as 65.1% during the electrolyte reuse trials. Cu was the most abundant metal in the recovered stream. The PEG electrolyte showed great robust properties and can be reused at least six times with no sign of composition change. Moreover, each trial improved Cu recovery selectivity for the subsequent trial as the carried-over Cu 2+ contributed positively to its depositions�the Cu selectivity almost doubled from 25.9% to 45.2% after the electrolyte was reused six times. The influence of different e-waste abundant metals on Cu's recovery rate was also examined. It was discovered that Al and Fe have a strong influence, but Sn does not. We also examined the recovery of precious metals Au, Ag, and Pd and observed Au recovered well with an excellent FE at 89.37%, but Ag and Pd could not be recovered efficiently due to their precipitations. In summary, the PEG electrolyte system offered a robust, safe, and mild electrochemical strategy to recover valuable metals from industrial e-waste.

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