Constructing a cationic pyridine for the highly selective and efficient recovery of gold from waste printed circuit boards

Chen, Shuliang; Zhao, Li; Li, Xinrong; Chen, Zhen; Hu, Xianzhi; Zi, Futing

doi:10.1016/j.cej.2024.149325

Cited by 3 publications

(2 citation statements)

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“…Similarly, 10 mg of adsorbent was added to 20 mL of a 100 mg/L Au(III) solution at the same pH. The adsorption experiments were conducted in a water bath thermostatic oscillator at 298 K. Samples were taken at different time points (1,5,10,15,20,30,60,90, and 120 min) to examine the effect of time on the experiments. A total of 10 mg of adsorbent was added to 20 mL of a 200 mg/L Au(III) solution at the same pH for 1 h. Adsorption experiments were conducted at different temperatures (298 K, 308 K, 318 K, 328 K, and 338 K) to investigate the impact of temperature on the experimental adsorption amount.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…Polymers are commonly used as adsorbent materials for gold recovery. For instance, Chen et al [20] developed cationic pyridine polymers with different configurations (4-AP/PCMS) to selectively recover gold from WPCB leachate. The maximum adsorption capacity was Molecules 2024, 29, 2398 2 of 14 found to be 437.68 mg/g, and a high adsorption rate was maintained even after five cycles of adsorption and desorption.…”

Section: Introductionmentioning

confidence: 99%

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

Dong,

Shang,

Zhang

et al. 2024

Molecules

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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 AuCl4−, 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.

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