An N-Rich Polymer for the Selective Recovery of Gold from Wastewater

The recovery of valuable gold from wastewater is of great interest because of the widespread use of the precious metal in various fields and the pollution generated by gold-containing wastes in water. In this paper, a water-insoluble cross-linked adsorbent material (TE) based on cyanuric chloride (T...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2024-05, Vol.29 (10), p.2398
Main Authors: Dong, Haonan, Shang, Ge, Zhang, Yi, Dai, Enrui, Shao, Mingdong, Chen, Chunfeng, He, Hongxing, Nie, Zhifeng, Xiong, Mingyang, Miao, Deren, Zhao, Sibiao
Format: Article
Language:English
Subjects:
Adsorbents
adsorptiological modeling
Adsorption
adsorption mechanism
Binding sites
Chemical industry
Chemical properties
DFT calculations
Efficiency
Equilibrium
Experiments
Gold
gold resource recovery
Herbicides
Jewelry
Pesticides industry
Polymerization
Polymers
Pore size
Precious metals
selective adsorption
Temperature
Wastewater
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Summary:The recovery of valuable gold from wastewater is of great interest because of the widespread use of the precious metal in various fields and the pollution generated by gold-containing wastes in water. In this paper, a water-insoluble cross-linked adsorbent material (TE) based on cyanuric chloride (TCT) and ethylenediamine (EDA) was designed and used for the adsorption of Au(III) from wastewater. It was found that TE showed extremely high selectivity (D = 49,213.46) and adsorption capacity (256.19 mg/g) for Au(III) under acidic conditions. The adsorption rate remained above 90% eVen after five adsorption-desorption cycles. The adsorption process followed the pseudo-first-order kinetic model and the Freundlich isotherm model, suggesting that physical adsorption with a multilayer molecular overlay dominates. Meanwhile, the adsorption mechanism was obtained by DFT calculation and XPS analysis, and the adsorption mechanism was mainly the electrostatic interaction and electron transfer between the protonated N atoms in the adsorbent (TE) and AuCl , which resulted in the redox reaction. The whole adsorption process was the result of the simultaneous action of physical and chemical adsorption. In conclusion, the adsorbent material TE shows great potential for gold adsorption and recovery.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules29102398