A 2D mesoporous hydrazone covalent organic framework for selective detection and ultrafast recovery of Au(III) from electronic waste

Zhang, Li; Fan, Jia-Qi; Zheng, Qiong-Qing; Xiao, Sai-Jin; Zhang, Cheng-Rong; Yi, Shun-Mo; Liu, Xin; Jiang, Wei; Tan, Quan-Gen; Liang, Ru‐Ping; Qiu, Jian‐Ding

doi:10.1016/j.cej.2022.140212

Cited by 13 publications

(14 citation statements)

References 48 publications

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“…The higher ζ-potential of PCN-224 in light led to relatively stronger repulsion to positive nonprecious metal ions, thus showing enhanced selectivity. In summary, we found that visible light largely promoted the Au recovery performance of PCN-224 and made it superior to other materials in terms of recovery capacity ( q max ) and selectivity ( K d ), including UiO-66, COFs, − polymers, ,,, and 2D materials ,, (Figure S9).…”

Section: Resultsmentioning

confidence: 90%

Selective and Light-Enhanced Au(III) Recovery by a Porphyrin-Based Metal–Organic Framework: Performance and Underlying Mechanisms

et al. 2023

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Recovering gold from unconventional sources, such as electronic waste, offers significant environmental and economic benefits. Exploiting materials and methods with high efficiency and selectivity is demanding. Herein, we reported a novel light-enhanced Au(III) recovery process using a porphyrin-based metal–organic framework (PCN-224). Our results showed that PCN-224 exhibited a remarkable Au(III) recovery capacity of up to 2613 mg/g when exposed to visible light irradiation, which was 3 times higher than that in the dark. Furthermore, light irradiation also improved the Au selectivity of PCN-224 against coexisting ions, including Zn2+, Mg2+, Cd2+, Ni2+, Hg2+, Cu2+, Pb2+, Al3+, and Fe3+. Based on characterization and kinetic analysis, an adsorption–reduction mechanism was proposed for the light-enhanced Au recovery, and porphyrin linkers played an essential role as active sites for both adsorption and reduction. To further protect the porphyrin linkers in PCN-224, acetic acid was introduced as a representative electron donor molecule in electronic waste, which could further enhance the Au(III) recovery capacity to 4946 mg/g. In addition, we demonstrated that PCN-224 and its light-enhanced feature also performed effectively in the actual leaching solution of waste electrical and electronic equipment, and the framework was successfully reused for at least six cycles. Overall, our discoveries could inspire the design of more outstanding materials and the artful use of clean energy to recover precious metals while minimizing the environmental impact.

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Section: Resultsmentioning

confidence: 90%

Selective and Light-Enhanced Au(III) Recovery by a Porphyrin-Based Metal–Organic Framework: Performance and Underlying Mechanisms

et al. 2023

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“…Fluorescence dynamic quenching would account for the reduction in fluorescence lifetime, which indicated that photo-induced electron transfer (PET) occurs between Au( iii ) and material. 33 To further investigate the PET mechanism, density functional theory (DFT) calculations were performed to calculate the HOMO/LUMO energy levels for PCS-CZ-B-DCM and [AuCl 4 ] − (Table S3†). It was found that the LUMO energy of the PCS-CZ-B-DCM (−2.79 eV) was higher than the LUMO energy of [AuCl 4 ] − (−4.47 eV), which indicated that the electron transfer from excited PCS-CZ-B-DCM to [AuCl 4 ] − was efficient and facile (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…2I). 33 The linear relationship between the Au(III) concentration and uorescence intensity was observed and ranged from 0 to 200 ppm. The quenching constants (K SV ) of PCS-CZ-B-DCM and PCSs@chitosan were 1.60 × 10 5 M −1 and 1.87 × 10 5 M −1 , respectively, when calculated from the linear Stern-Volmer curve (Fig.…”

Section: Quantitative and Selectivity Detection Of Au(iii) Ionsmentioning

confidence: 96%

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Ultrafast and highly selective gold recovery with high capture capacity from electronic waste by upconversion of a silsesquioxane-based hybrid luminescent aerogel

Wang,

Unno,

Liu

2024

J. Mater. Chem. A

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“…Considering these various separation technologies, recent published applications of these on gold(III) processing included solvent extraction [ 7 , 8 , 9 , 10 , 11 ], precipitation [ 12 , 13 ], ion exchange [ 14 , 15 , 16 ], adsorption [ 17 , 18 , 19 , 20 , 21 ] and even polymer inclusion membranes [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

On the Use of Pseudo-Protic Ionic Liquids to Extract Gold(III) from HCl Solutions

Robla

2023

IJMS

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Solvent extraction of gold(III) from HCl media using pseudo-protic ionic liquids (PPILs) dissolved in toluene as the extractant phase is investigated. Three PPILs are generated from the reaction of commercially available amines and 1 M HCl solution and named as pri-NH2H+Cl- (derived from the primary amine Primene 81R), sec-NHH+Cl− (derived from the secondary amine Amberlite LA2) and ter-NH+Cl− (derived from the tertiary amine Hostarex A327). In the above structures, -NH2H+Cl−, -NHH+Cl− and -NH+Cl− represented the active groups (anion exchangers) of the respective PPIL. In the case of gold(III) extraction, the experimental variables investigated included the equilibration time (2.5–30 min), temperature (20–60 °C), HCl concentrations (1–10 M) in the aqueous phase, gold(III) concentration (0.005–0.05 g/L) in this same phase, and PPILs concentrations in the organic phase. From the experimental data, and using the Specific Interaction Theory, the interaction coefficients (ε) for the pair AuCl4−, H+ are estimated for the systems involving the three PPILs. Gold(III) is recovered from the metal-loaded organic phases using sodium thiocyanate solutions, and from these, gold is finally recovered by the precipitation of zero-valent gold (ZVG) nanoparticles.

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A 2D mesoporous hydrazone covalent organic framework for selective detection and ultrafast recovery of Au(III) from electronic waste

Cited by 13 publications

References 48 publications

Selective and Light-Enhanced Au(III) Recovery by a Porphyrin-Based Metal–Organic Framework: Performance and Underlying Mechanisms

Selective and Light-Enhanced Au(III) Recovery by a Porphyrin-Based Metal–Organic Framework: Performance and Underlying Mechanisms

Ultrafast and highly selective gold recovery with high capture capacity from electronic waste by upconversion of a silsesquioxane-based hybrid luminescent aerogel

On the Use of Pseudo-Protic Ionic Liquids to Extract Gold(III) from HCl Solutions

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