Three-Dimensional, Vertical Platelets of ZnO Carriers for Selective Extraction of Cobalt Ions from Waste Printed Circuit Boards

Gomaa, H., El-Safty, Sherif-A, Shenashen, M. A., Kawada, S., Yamaguchi, H., Abdelmottaleb, M. and Cheira, M. F. (2018) Three-Dimensional, Vertical Platelets of ZnO Carriers for Selective Extraction of Cobalt Ions from Waste Printed Circuit Boards. ACS Sustainable Chemistry & Engineering, 6 (11). pp. 13813-13825. ISSN 2168-0485

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Abstract

Controlled design of low-cost, ecofriendly, and efficient metal recycling process of waste printed circuit boards (PCBs) is essential for sustainable industries. In this study, a metal extractor (ME) design was fabricated by anchoring organic chromophore chelate [(E)-4-((3-amino-4-hydroxyphenyl)diazenyl)naphthalen-1-ol (AHPDN)] into three-dimensional (3D) and vertical platelets of ZnO platforms to continuously extract and sensitively and selectively detect ultratrace Co2+ concentration (∼95.7%) in real e-waste leach liquor. Results reveal that the microscopic ZnO platelet hierarchy is successfully fabricated with nonstacked 3D platelet morphology through hydrothermal-assisted methodology. The 3D nonstacked ZnO platelets are oriented in horizontal and vertical domains, thereby enabling fabrication of potential ME for multidirectional diffusion and efficient adsorptivity of Co2+ ions. Multidiffusible, intermingled platelets and numerous active sites that decorated the ME hierarchy promote the ultratrace separation and recovery of Co2+ ions from PCBs. This scalable immobilization and accommodation of AHPDN along ZnO platelet surfaces effectively controls the Co2+ ion-recovery/extraction process. The selective adsorption of Co2+ ions in the presence of other competitive ions strongly depends on pH control assay. The consumed MEs can be repeatedly recycled, their platelet hierarchy and surface features are retained, and their selective adsorption functionalities are negligibly altered. Hierarchical MEs are suitable for the extraction of Co2+ from the waste PCBs.

Item Type: Article
Additional Information: ** From Crossref via Jisc Publications Router ** History: epub 02-09-2018; issued 02-09-2018; ppub 05-11-2018.
SWORD Depositor: Publication Router
Depositing User: Publication Router
Date Deposited: 26 May 2020 18:46
Last Modified: 26 May 2020 18:46
URI: http://sure.sunderland.ac.uk/id/eprint/11931
ORCID for Sherif-A El-Safty: ORCID iD orcid.org/0000-0001-5992-9744

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