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<p>From a highly valuable metal blend produced from electronic waste, precious metals could be selectively beneficiated by combined electrochemical leaching and electrodeposition in deep eutectic solvents. For the case of silver presented in this work, 25&#xa0;µm thick deposits have been prepared from ethaline 1:2 and propeline 1:3 deep eutectic solvents in a lab-scale stirred cell at various current densities in a dry atmosphere, with faradaic yields close to 100% for both anodic leaching and cathodic deposition. The change in roughness over the runs was followed by comparison of overall charge/mass transfer rates and apparent diffusion coefficients, estimated from cyclic and linear sweep voltammetries. These properties were found to be one order of magnitude larger than those observed at a well-polished platinum disk surface. The deposits consisted of a compact layer formed by 10–25&#xa0;µm regular grains with little significant coalescence, with the presence of larger dendritic entities in peripheral regions of the electrode, resulting from local more sluggish agitation. The use of current pulsation with different duty cycles and pulse-on times led to visible improvement of the deposit morphology and smaller grains with propeline 1:3, whereas no real changes were observed with ethaline 1:2. More environment-friendly propeline 1:3 thus appears an effective alternative to ethaline 1:2.</p> Graphical abstract <p></p>

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Thick silver electrodeposits from ethaline and propeline deep eutectic solvents toward recovery of precious metals from waste

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • François Lapicque,
  • Calogera Bertoloni,
  • Stéphanie Michel,
  • Benjamin Rotonnelli,
  • Sophie Legeai

摘要

From a highly valuable metal blend produced from electronic waste, precious metals could be selectively beneficiated by combined electrochemical leaching and electrodeposition in deep eutectic solvents. For the case of silver presented in this work, 25 µm thick deposits have been prepared from ethaline 1:2 and propeline 1:3 deep eutectic solvents in a lab-scale stirred cell at various current densities in a dry atmosphere, with faradaic yields close to 100% for both anodic leaching and cathodic deposition. The change in roughness over the runs was followed by comparison of overall charge/mass transfer rates and apparent diffusion coefficients, estimated from cyclic and linear sweep voltammetries. These properties were found to be one order of magnitude larger than those observed at a well-polished platinum disk surface. The deposits consisted of a compact layer formed by 10–25 µm regular grains with little significant coalescence, with the presence of larger dendritic entities in peripheral regions of the electrode, resulting from local more sluggish agitation. The use of current pulsation with different duty cycles and pulse-on times led to visible improvement of the deposit morphology and smaller grains with propeline 1:3, whereas no real changes were observed with ethaline 1:2. More environment-friendly propeline 1:3 thus appears an effective alternative to ethaline 1:2.

Graphical abstract