DOI: https://doi.org/10.14710/jksa.27.2.64-71

Silver Recovery from E-Waste Printed Circuit Board Using Binary and Ternary Deep Eutectic Solvents

Department of Chemistry, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia, Bandung, Indonesia

Received: 4 Nov 2023; Revised: 1 Mar 2024; Accepted: 5 Mar 2024; Published: 20 Mar 2024.
Open Access Copyright 2024 Jurnal Kimia Sains dan Aplikasi under http://creativecommons.org/licenses/by-sa/4.0.

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Silver Recovery from E-Waste Printed Circuit Board Using Binary and Ternary Deep Eutectic Solvents Graphical Abstract
Abstract

Printed Circuit Boards (PCBs) are essential components of electronic devices containing valuable silver metal. Using sustainable methods, silver recovery from electronic trash, like PCBs, demonstrates excellent promise. This research’s objective is to determine the optimum leaching time and solid-to-liquid (S/L) ratio for extracting silver from PCB using deep eutectic solvent (DES) composed of choline chloride and glycerol (glyceline DES). The binary DES’s leaching performance was then compared to choline chloride, glycerol, and citric acid ternary systems. Fourier Transform Infrared Spectroscopy (FTIR) was carried out to analyze the bond interactions. X-ray fluorescence spectrometry (XRF) was employed to determine the PCB’s metal concentration prior to and after the leaching process. Ternary DES was viscous, colorless, stable for 60 days, and less acidic than binary DES, with a 1.21 g/mL density. FTIR peak broadening and shifting indicated the formation of a new hydrogen bond and proved a successful synthesis of ternary DES. XRF result showed that PCB’s initial silver metal content was 2.32%. The optimal silver leaching from PCB using glyceline DES was achieved after 16 hours, with a 1/20 solid-to-liquid ratio. Ternary DES demonstrated a silver leaching efficiency of 93.65%, surpassing 86.77% of glyceline. Ternary DES synthesized in this study has the potential to serve as an efficient and environmentally friendly solvent for extracting silver from PCB, providing a sustainable approach to managing electronic waste.

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Keywords: Printed circuit board; silver metal; ternary DES; glyceline DES; leaching optimization
Funding: Directorate of Learning and Student Affairs (Belmawa); Ministry of Education and Culture of the Republic of Indonesia under contract Pekan Kreativitas Mahasiswa Riset Eksakta (PKM-RE) 2023

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Section: Research Articles
Language : EN
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