Triazine-crosslinked polyethyleneimine for efficient adsorption and recovery of gold from wastewater

Hu, Bowen; Yang, Ming; He, Haibo; Song, Zilin; Tao, Peng; Wu, Yangzhou; Yang, Changan; Tang, Kewen; Chen, Xiaobo

doi:10.1016/j.molliq.2022.120586

Cited by 12 publications

(3 citation statements)

References 50 publications

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“…According to Figure a–c and Table , it can be seen that the correlation coefficient of the PSO model ( R 2 = 0.9984–0.9990) was higher than that of the PFO model ( R 2 = 0.7851–0.9450), and the q e,cal of the PSO model was closer to that of q e,exp , indicating that the PSO model was more suitable for describing the adsorption behavior of SDS on PVB . This suggested that the adsorption of SDS on PVB was more likely to be a chemisorption process, which was mainly based on electrostatic interactions between negative dodecyl sulfonate ions and positive PVB . The q e,cal and equilibrium rate constants of both PFO and PSO increased as the temperature decreased, indicating that a lower temperature favored adsorption.…”

Section: Conclusion and Discussionmentioning

confidence: 90%

“…29 This suggested that the adsorption of SDS on PVB was more likely to be a chemisorption process, which was mainly based on electrostatic interactions between negative dodecyl sulfonate ions and positive PVB. 30 The q e,cal and equilibrium rate constants of both PFO and PSO increased as the temperature decreased, indicating that a lower temperature favored adsorption. This further suggested that the adsorption process was exothermic.…”

Section: Effect Of Particle Sizementioning

confidence: 98%

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Adsorption of Sodium Dodecyl Sulfonate from Aqueous Solution by Polyvinyl Butyral: Kinetics and Thermodynamics

Sun

Zeng

2023

Ind. Eng. Chem. Res.

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During the synthesis of polyvinyl butyral (PVB), sodium dodecyl sulfonate (SDS) is generally added in appropriate amounts, which prevents PVB from agglomeration but also causes PVB to turn yellow. The removal of SDS and its final residue in PVB are closely related to the adsorption performance of SDS on PVB. In this study, PVB with a high acetal degree (81.96 mol %) was synthesized by polyvinyl alcohol and butyraldehyde and was characterized by 1H NMR, Fourier transform infrared spectroscopy, scanning electron microscopyenergy-dispersive X-ray spectroscopy, and other methods. The adsorption properties of SDS on PVB were investigated under different initial pHs, PVB doses, PVB particle sizes, contact times, initial SDS concentrations, and temperatures. The adsorption kinetic data were analyzed using pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The results showed that the pseudo-second-order model fitted the adsorption data well, and the intraparticle diffusion was not the only control mechanism for PVB adsorption. The equilibrium data were analyzed with Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich models. The results showed that the adsorption data conformed to the Langmuir model, and the maximum adsorption capacity of PVB for SDS was 40.5168 mg/g at 290.15 K. Moreover, the Dubinin–Radushkevich model illustrated that the adsorption process was chemisorption at low SDS concentrations and physical adsorption otherwise. The thermodynamic parameters showed that the adsorption of SDS on PVB was spontaneous and exothermic. In conclusion, the research results provide some basis for the PVB purification plant equipment.

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Section: Conclusion and Discussionmentioning

confidence: 90%

Section: Effect Of Particle Sizementioning

confidence: 98%

Adsorption of Sodium Dodecyl Sulfonate from Aqueous Solution by Polyvinyl Butyral: Kinetics and Thermodynamics

Sun

Zeng

2023

Ind. Eng. Chem. Res.

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“…The Fukui function was used to calculate the binding sites of TE. Equation ( 13) below was used to calculate the adsorption energy between the adsorbent and the metal ion [36].…”

Section: Dft Calculationsmentioning

confidence: 99%

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

Chen,

Zhao,

et al. 2024

Chemical Engineering Journal

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Triazine-crosslinked polyethyleneimine for efficient adsorption and recovery of gold from wastewater

Cited by 12 publications

References 50 publications

Adsorption of Sodium Dodecyl Sulfonate from Aqueous Solution by Polyvinyl Butyral: Kinetics and Thermodynamics

Adsorption of Sodium Dodecyl Sulfonate from Aqueous Solution by Polyvinyl Butyral: Kinetics and Thermodynamics

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

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

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