Gold recovery from E-waste using freestanding nanopapers of cellulose and ionic covalent organic frameworks

[Display omitted] •The ionic COF had an high gold capture capacity from diluted aqueous solutions.•The gold capture process on the COF was extremely fast and highly selectively.•Freestanding nanopapers consisting of cellulose fibers and COF were prepared.•The nanopapers enabled efficient gold recove...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 458; p. 141498
Main Authors: Xu, Qinqin, Du, Xing-Hao, Luo, Dan, Strømme, Maria, Zhang, Qian-Feng, Xu, Chao
Format: Journal Article
Language:English
Published: Elsevier B.V 15.02.2023
Subjects:
Cellulose fibers
Covalent organic frameworks
E-waste
Engineering Science with specialization in Nanotechnology and Functional Materials
Freestanding membranes
Precious metal recovery
Teknisk fysik med inriktning mot nanoteknologi och funktionella material
E-waste
Covalent organic frameworks
Cellulose fibers
Precious metal recovery
Freestanding membranes
ISSN:1385-8947, 1873-3212, 1873-3212
Online Access:Get full text
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Summary:[Display omitted] •The ionic COF had an high gold capture capacity from diluted aqueous solutions.•The gold capture process on the COF was extremely fast and highly selectively.•Freestanding nanopapers consisting of cellulose fibers and COF were prepared.•The nanopapers enabled efficient gold recovery from E-waste leaching solution.•The CF-COF nanopapers can be prepared with a relatively low cost. The ever-increasing production of electronic devices generates a huge amount of electronic waste (E-waste). Therefore, there is an urgent need for advanced recycling technology for E-waste that provides both economic and environmental benefits. Herein, we describe the preparation of flexible, freestanding CF-COF nanopapers consisting of cellulose fibers (CFs) and guanidinium-based ionic covalent organic framework (COF) that can be used for recovering gold from E-waste leaching solutions via a membrane separation technique. Due to the synergetic effects of physical adsorption, ion exchange and chemical reduction, the COF has an extremely high capture capacity (up to 1,794 mg of Au per gram of COF), is highly selective and has fast kinetics for adsorbing trace amounts of [AuCl4]− in aqueous solution. The high COF loadings (∼50 wt%) and hierarchical porosity of the CF-COF nanopapers resulted in excellent performance when capturing gold species from the E-waste leaching solution. This study provides new possibilities for developing sustainable membrane materials, and highly efficient and cost-effective techniques for the recovery of precious metals from E-waste.
ISSN:1385-8947
1873-3212
1873-3212
DOI:10.1016/j.cej.2023.141498