Enhanced copper extraction from waste printed circuit boards using glycine after supercritical methanol pre-treatment : Process optimization, leaching kinetics, and thermodynamic analysis
Copyright © 2024 Elsevier Ltd. All rights reserved.
| Veröffentlicht in: | Waste management (New York, N.Y.). - 1999. - 193(2025) vom: 01. Feb., Seite 551-560 |
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| Weitere Verfasser: | , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2025
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| Zugriff auf das übergeordnete Werk: | Waste management (New York, N.Y.) |
| Schlagworte: | Journal Article Copper extraction Glycine Leaching kinetics WPCBs Copper 789U1901C5 TE7660XO1C Methanol Y4S76JWI15 |
| Zusammenfassung: | Copyright © 2024 Elsevier Ltd. All rights reserved. The disposal of waste-printed circuit boards (WPCBs) poses significant environmental and health risks, as they are a major component of e-waste containing hazardous materials. However, WPCBs also contain valuable metallic elements, making them important resources for recycling. To address the dual challenge of hazardous waste management and resource recovery, sustainable approaches for metal extraction from WPCBs are imperative. The present study, thus aimed to explore the use of glycine as an environment-friendly alternative to conventional inorganic acid-leaching agents for copper extraction from WPCBs. The integration of glycine leaching with pre-treatment under supercritical conditions with methanol enhanced the copper liberation efficiency along with improved mass transfer processes. Under optimized conditions of 0.5 M glycine concentration, 5 % (v/v) H2O2 concentration, 1.5:100 g/mL solid-to-liquid ratio, and 40 °C temperature, a remarkably high copper extraction efficiency of 97.46 % was achieved within a 15 h leaching duration. Besides, the kinetic studies indicated a mixed-controlled reaction mechanism for the metal extraction process, with a calculated activation energy of 40.01 kJ/mol. Additionally, a thorough characterization of the recovered metal-leached salt provided insights into the compound's nature and leaching mechanism. This integrated approach developed thus offers a sustainable and environment-friendly method for reducing the hazardousness of WPCBs while simultaneously extracting valuable metals, contributing to the advancement of e-waste management practices and environmental sustainability |
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| Beschreibung: | Date Completed 29.04.2025 Date Revised 29.04.2025 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1879-2456 |
| DOI: | 10.1016/j.wasman.2024.12.037 |