Green Deep Eutectic Solvents (DESs) for Sustainable Metal Recovery from Thermally Treated PCBs: A Greener Alternative to Conventional Methods.

Autor: Mishra S; Green and Sustainable Engineering Lab, Department of Chemical Engineering, IIT Delhi, Hauz Khaz, Delhi, 110016, India.; School of Chemical and Process Engineering, University of Leeds, Leeds, LS29JT, United Kingdom., Hunter TN; School of Chemical and Process Engineering, University of Leeds, Leeds, LS29JT, United Kingdom., Pant KK; Green and Sustainable Engineering Lab, Department of Chemical Engineering, IIT Delhi, Hauz Khaz, Delhi, 110016, India.; Department of Chemical Engineering, IIT Roorkee, Roorkee, 247667, India., Harbottle D; School of Chemical and Process Engineering, University of Leeds, Leeds, LS29JT, United Kingdom.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2024 Apr 22; Vol. 17 (8), pp. e202301418. Date of Electronic Publication: 2024 Jan 30.
DOI: 10.1002/cssc.202301418
Abstrakt: Waste PCBs the core of e-waste is rich in copper, tin, zinc, iron, and nickel. Leaching base metals from PCB used to be done in toxic, corrosive acidic/alkali mediums. In this work, an environmentally friendly method for leaching metals from thermally treated PCBs (TPCBs) of mobile phones was proposed using choline chloride based deep eutectic solvents (DES). DES selectivity and solubility of metals from metal oxides were the main screening criteria. FA-ChCl had the maximum solubility of Cu, Fe, and Ni, while Urea-ChCl had high Zn selectivity and solubility. Oxalic acid has high selectivity for Sn. FA-ChCl extracted Cu and Fe best at 16 h, 100 °C, and 1/30 g/mL. Urea-ChCl extracted Zn (90.4±2.9 %) from TPCBs at 100 °C, 21 h, 1/20 g/mL, and 400 rpm. Oxalic acid (1 M) removed 92.3±2.1 % Sn from TPCBs in 1 h at 80 °C and 1/20 g/mL. The shrinking core model-based kinetic investigation of FA-ChCl for Cu extraction showed a diffusion-controlled process. The proposed method is greener than mineral acids utilized for metal extraction.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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