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Utilizing cost-effective pyrocarbon for highly efficient gold retrieval from e-waste leachate
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Utilizing cost-effective pyrocarbon for highly efficient gold retrieval from e-waste leachate
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Journal Article
Utilizing cost-effective pyrocarbon for highly efficient gold retrieval from e-waste leachate
2024
Overview
Addressing burdens of electronic waste (E-waste) leachate while achieving sustainable and selective recovery of noble metals, such as gold, is highly demanded due to its limited supply and escalating prices. Here we demonstrate an environmentally-benign and practical approach for gold recovery from E-waste leachate using alginate-derived pyrocarbon sorbent. The sorbent demonstrates potent gold recovery performance compared to most previously reported advanced sorbents, showcasing high recovery capacity of 2829.7 mg g
−1
, high efficiency (>99.5%), remarkable selectivity (
K
d
~ 3.1 × 10
8
mL g
−1
), and robust anti-interference capabilities within environmentally relevant contexts. The aromatic structures of pyrocarbon serve as crucial electrons sources, enabling a hydroxylation process that simultaneously generates electrons and phenolic hydroxyls for the reduction of gold ions. Our investigations further uncover a “stepwise” nucleation mechanism, in which gold ions are reduced as intermediate gold-chlorine clusters, facilitating rapid reduction process by lowering energy barriers from 1.08 to −21.84 eV. Technoeconomic analysis demonstrates its economic viability with an input-output ratio as high as 1370%. Our protocol obviates the necessity for organic reagents whilst obtaining 23.96 karats gold product from real-world central processing units (CPUs) leachates. This work introduces a green sorption technique for gold recovery, emphasizing its role in promoting a circular economy and environmental sustainability.
The demand for gold recovery from E-Waste is significant due to its high value. Here, authors present a practical method for extracting gold from an actual E-waste leachate using alginate-derived pyrocarbon. This approach yields a 23.96 karat gold product and demonstrates strong economic viability.
