Sorbent selection for the recovery of gallium and indium from aqueous solutions: a sustainable approach to the recovery of strategic metals from LED lamps.

Autor: Sáez P; Department of Chemical and Materials Engineering (CyPS Research Group), School of Chemical Sciences, Universidad Complutense de Madrid, 28040, Madrid, Spain., Díez E; Department of Chemical and Materials Engineering (CyPS Research Group), School of Chemical Sciences, Universidad Complutense de Madrid, 28040, Madrid, Spain. ediezalc@ucm.es., Gómez JM; Department of Chemical and Materials Engineering (CyPS Research Group), School of Chemical Sciences, Universidad Complutense de Madrid, 28040, Madrid, Spain., López C; Department of Chemical and Materials Engineering (CyPS Research Group), School of Chemical Sciences, Universidad Complutense de Madrid, 28040, Madrid, Spain., Conte N; Department of Chemical and Materials Engineering (CyPS Research Group), School of Chemical Sciences, Universidad Complutense de Madrid, 28040, Madrid, Spain., Lobete M; Department of Chemical and Materials Engineering (CyPS Research Group), School of Chemical Sciences, Universidad Complutense de Madrid, 28040, Madrid, Spain., Rodríguez A; Department of Chemical and Materials Engineering (CyPS Research Group), School of Chemical Sciences, Universidad Complutense de Madrid, 28040, Madrid, Spain.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Oct; Vol. 31 (47), pp. 57748-57764. Date of Electronic Publication: 2024 Sep 18.
DOI: 10.1007/s11356-024-34942-y
Abstrakt: Gallium and indium, metals present in light-emitting diode (LED) lighting technology, can be effectively recovered from aqueous solutions by sorption. For this purpose, carbonaceous materials, such as activated carbon, or low-cost biosorbents as beer bagasse, spent coffee grounds or peanut shells, and a low-cost zeolite as chabazite, were characterized by BET, FTIR, XRD, and SEM analysis prior use. Protonated chabazite, with high surface area (505 m 2 /g) and a Si/Al molar ratio of 3.4, showed high sorption capacities for gallium (56 mg/g) and indium (92 mg/g), which is 10 to 30 times higher than those of our carbonaceous materials (T = 298 K, pH < 3, dosage = 1 g/L). Sorption experiments with both metals in solution showed a competitive effect between gallium and indium for the sorption sites of the chabazite, showing more affinity toward gallium than indium. Ga 3+ sorbed /In 3+ sorbed molar ratio above 2 was achieved for the same initial concentration of both metals, increasing to almost 3 when the initial gallium concentration increased, which was appropriate since gallium concentration tends to be higher in LED chips. However, the sorption capacity for both metals was always around 0.35 mmol Ga + In/g. The selectivity of the chabazite was conditioned by different behavior of both metals in aqueous solution at the sorption pH (below 3.5) being the predominant species in solution Ga(OH) 2+ for gallium and In 3+ for indium. Sorption with protonated chabazite can be used in the treatment of spent LEDs leachate for the dual purpose of water purification and selective metal separation.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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