Innentitelbild: Iodine‐Catalysed Dissolution of Elemental Gold in Ethanol (Angew. Chem. 14/2022)

Zupanc, A.; Heliövaara, Eeva; Moslova, Karina; Eronen, Aleksi; Kemell, Marianna; Podlipnik, Črtomir; Jereb, Marjan; Repo, Timo

doi:10.1002/ange.202203277

Cited by 2 publications

(3 citation statements)

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“…Oxidation of the Ag wire surface was in fact observed and EDS measurements (Figure S9) confirmed the formation of an AgCl passivation layer-a more stable phase that was excluded from DFT calculations. Metallic gold remains in the ChCl/U solution, even in the presence of I 2 or KBr, [28] without mass loss or visible changes. A different oxidant is needed to dissolve Au.…”

Section: Selectivitymentioning

confidence: 97%

“…Utilization of (biomass-based) organic media for noble metal recycling [28][29][30][31][32][33][34][35][36][37][38] seems to offer a paradigm shift towards selective metal dissolution with enhanced sustainability (Figure 1). Recent examples of single noble metal selective dissolution include the use of specific ligands [39][40][41] or conditions.…”

Section: Introductionmentioning

confidence: 99%

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Sequential Selective Dissolution of Coinage Metals in Recyclable Ionic Media

Zupanc,

Install,

Weckman

et al. 2024

Angewandte Chemie

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Coinage metals Cu, Ag and Au are essential for modern electronics and their recycling from waste materials is becoming increasingly important to guarantee the security of their supply. Designing new sustainable and selective procedures that would substitute currently used processes is crucial. Here, we describe an unprecedented approach for the sequential dissolution of single metals from Cu, Ag and Au mixtures using biomass‐derived ionic solvents and green oxidants. First, Cu can be selectively dissolved in the presence of Ag and Au with choline chloride/urea/H2O2 mixture, followed by the dissolution of Ag in lactic acid/H2O2. Finally, the metallic Au, which is not soluble in either solution above, is dissolved in choline chloride/urea/Oxone. Subsequently, the metals were simply and quantitatively recovered from dissolutions, and the solvents recycled and reused. The applicability of developed approach was demonstrated by recovering metals from electronic waste substrates such as printed circuit boards, gold fingers and solar panels. The dissolution reactions and selectivity were explored with different analytical techniques and DFT calculations. We anticipate our approach will pave a new way for contemporary and sustainable recycling of multi‐metal waste substrates.

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Section: Selectivitymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Sequential Selective Dissolution of Coinage Metals in Recyclable Ionic Media

Zupanc,

Install,

Weckman

et al. 2024

Angewandte Chemie

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“…For chalcogen donors, charge-transfer (CT) 'spoke' adducts, hypercoordinate 'T-shaped' adducts, halonium adducts, and different types of cationic oxidation products of the donors have been identified and structurally characterized (Knight et al, 2012;Saab et al, 2022). Worthy of note, diiodine CTadducts have been extensively investigated, also with a view to their application as leaching agents for toxic (Isaia et al, 2011) and precious metals (Zupanc et al, 2022) in waste from electrical and electronic equipment (WEEE). Among the pnictogen donors, many studies have focused on (poly)pyridyl derivatives.…”

Section: Chemical Contextmentioning

confidence: 99%