Highly selective recovery of gold from strong acidic wastewater with high-purity by self-driven capture

Ren, Jianran; Zhu, Zhiliang; Qiu, Yanling; Yu, Fei; Zhou, Tao; Ma, Jie; Zhao, Jianfu

doi:10.1016/j.cej.2023.147585

“…As a representative precious metal, beyond being used as jewelries, gold is extensively employed in electronics, medicine, and catalysis industries due to its robust corrosion resistance, excellent stability, superior electrical conductivity, and preferable thermal conductivity. − However, the surging emergence and accelerating renewal of electronic products render traditional mining routes insufficient to address the imbalance between the supply and demand for precious metal resources. Consequently, it is crucial to develop effective techniques for extracting gold from unconventional sources, such as electronic waste (e-waste), to supplement primary mining.…”

Section: Introductionmentioning

confidence: 99%

Dual-Crosslinking Polydopamine/Poly(imide dioxime) Porous Network Membrane Enables Efficient and Selective Gold Recovery from e-Waste

Zhang,

Li,

Liu

et al. 2024

ACS EST Eng.

2

0

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With the sharp increase in electronic and electrical equipment as well as concomitant electronic waste, it is imperative to recover precious metals from secondary resources from the perspective of environment protection and sustainable development. Herein, a free-standing, dual-cross-linking polydopamine (PDA) in conjunction with poly(imide dioxime) (PIDO) porous membrane (denoted as PDA/PIDO) is fabricated via a facile interfacial polymerization method for gold recovery. As expected, the constructed PDA/PIDO membrane features a hierarchical porous structure, ample active sites, and excellent hydrophilicity, endowing it with an ultrahigh gold capture capacity (3368 mg g −1 ), fast equilibrium time (35 min), superior recovery selectivity (separation factor of Au/Cu = 5.4 × 10 5 , Au/Ni = 3.9 × 10 5 ), high flux (1050 L m 2 h −1 ), and high retention rate (98%). Furthermore, the proposed PDA/PIDO membrane is also competent for selective gold recovery from the central processing unit leachate with remarkable efficiency in a continuous-flowing filtration system, highlighting its huge potential in practical large-scale gold recovery from e-waste.

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Anion‐Regulated Ionic Covalent Organic Frameworks for Highly Selective Recovery of Gold from E‐Waste

Zhao,

Qiao,

He

et al. 2024

Angewandte Chemie

0

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The existing electronic waste (e‐waste) and leaching solutions generated by industries accumulate significant amounts of gold (Au), even in excess of those in natural minerals. Therefore, the recycling of Au is extremely significant for the potential sustainability of chemical industry. By designing ionic covalent organic frameworks (COFs), here we synthesize a series of Ionic‐COF‐X (X=Cl−, Br−, AcO−, and SO42−) by anion regulation strategy and further explore their adsorption performance towards Au recovery. All these ionic COFs exhibit ultrahigh gold adsorption efficiency and excellent regeneration. Moreover, anion regulation could indeed affect the Au capture performance. In particular, when Cl− ions serve as counter ions, the Au capacity of Ionic‐COF‐Cl could reach 1270.8 mg g−1. Moreover, in the actual CPU leaching solution test, the selectivity of Ionic‐COF‐Cl towards Au3+ ion hits 39000 and 4600 times higher than that of Cu2+ and Ni2+ ions, respectively, suggesting that the Ionic‐COF‐Cl is a promising material for highly selective recovering gold from actual e‐waste. DFT calculations further reveal that counter ions can regulate the adsorption affinity of ionic COF framework toward Au. In short, this work provides a useful anion regulation strategy to design ionic COFs as a promising platform for gold selective recovery from actual e‐waste.

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Anion‐Regulated Ionic Covalent Organic Frameworks for Highly Selective Recovery of Gold from E‐Waste

Zhao,

Qiao,

He

et al. 2024

Angew Chem Int Ed

0

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The existing electronic waste (e‐waste) and leaching solutions generated by industries accumulate significant amounts of gold (Au), even in excess of those in natural minerals. Therefore, the recycling of Au is extremely significant for the potential sustainability of chemical industry. By designing ionic covalent organic frameworks (COFs), here we synthesize a series of Ionic‐COF‐X (X=Cl−, Br−, AcO−, and SO42−) by anion regulation strategy and further explore their adsorption performance towards Au recovery. All these ionic COFs exhibit ultrahigh gold adsorption efficiency and excellent regeneration. Moreover, anion regulation could indeed affect the Au capture performance. In particular, when Cl− ions serve as counter ions, the Au capacity of Ionic‐COF‐Cl could reach 1270.8 mg g−1. Moreover, in the actual CPU leaching solution test, the selectivity of Ionic‐COF‐Cl towards Au3+ ion hits 39000 and 4600 times higher than that of Cu2+ and Ni2+ ions, respectively, suggesting that the Ionic‐COF‐Cl is a promising material for highly selective recovering gold from actual e‐waste. DFT calculations further reveal that counter ions can regulate the adsorption affinity of ionic COF framework toward Au. In short, this work provides a useful anion regulation strategy to design ionic COFs as a promising platform for gold selective recovery from actual e‐waste.

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Highly selective recovery of gold from strong acidic wastewater with high-purity by self-driven capture

Cited by 9 publications

References 69 publications

Dual-Crosslinking Polydopamine/Poly(imide dioxime) Porous Network Membrane Enables Efficient and Selective Gold Recovery from e-Waste

Dual-Crosslinking Polydopamine/Poly(imide dioxime) Porous Network Membrane Enables Efficient and Selective Gold Recovery from e-Waste

Anion‐Regulated Ionic Covalent Organic Frameworks for Highly Selective Recovery of Gold from E‐Waste

Anion‐Regulated Ionic Covalent Organic Frameworks for Highly Selective Recovery of Gold from E‐Waste

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