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Tailoring lixiviant properties to optimise selectivity in E-waste recycling

DOI: 10.1039/D2SU00038E DOI Help

Authors: Jennifer M. Hartley (University of Leicester) , Sean Scott (University of Leicester) , Rodolfo Marin Rivera (University of Leicester) , Phil Hunt (University of Leicester) , Anthony J. Lucio (University of Leicester) , Philip Bird (University of Leicester) , Robert Harris (University of Leicester) , Gawen R. T. Jenkin (University of Leicester) , Andrew P. Abbott (University of Leicester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Rsc Sustainability , VOL 15

State: Published (Approved)
Published: November 2022
Diamond Proposal Number(s): 26622

Open Access Open Access

Abstract: The scale of E-waste production makes the selective recovery of technology metals an important research topic. It has previously been shown that deep eutectic solvents, DESs, can be used to rapidly digest gold and in the current study the effect of varying water and ethylene glycol content on the ability to selectively recover metals in DESs was investigated. It was found that increased water content resulted in an increase in metal etching rates for copper due to the decreasing viscosity of the solution, but etching rates of nickel, silver and gold were decreased due to the competition between chloride and oxide/hydroxide chemistry causing passivating films to form. Iodine was used as a catalyst and speciation was investigated in different solvent compositions. The ratio of the two trihalide species was mostly unaffected by solvent composition, but the presence of molecular iodine was detected with 20 wt% water due to decreased iodine solubility resulting from lower chloride concentration. It was determined that solvent physical properties were most important for metal etching rates at low water content, but at high water content the effect of oxide/hydroxide chemistry was more significant, resulting in the possibility of selective metal etching of copper from PCBs.

Subject Areas: Materials, Chemistry, Environment

Instruments: B18-Core EXAFS

Added On: 19/11/2022 10:55


Discipline Tags:

Earth Sciences & Environment Physical Chemistry Chemistry Materials Science Metallurgy

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)