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Article

Kinetics, Thermodynamics and Equilibrium Studies for Gold Recovery from Diluted Waste Solution

1
Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University of Timisoara, 2 Piata Victoriei, 300006 Timisoara, Romania
2
Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
3
Research Institute for Renewable Energies, Politehnica University of Timişoara, 138 Gavril Musicescu, 300501 Timisoara, Romania
*
Authors to whom correspondence should be addressed.
Academic Editor: Carlos Javier Duran-Valle
Materials 2021, 14(18), 5325; https://doi.org/10.3390/ma14185325
Received: 9 August 2021 / Revised: 8 September 2021 / Accepted: 12 September 2021 / Published: 15 September 2021
(This article belongs to the Special Issue Adsorption and Desorption Behavior for Rare Earth Metal Ions)
2,2′-thiobisethanol dimethacrylate/ethylene glycol dimethacrylate copolymer (coP-TEDMA/EGDMA) was used as a sorbent for gold recovery from residual solutions resulting from the electroplating industry. Firstly, synthesized material was characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and confocal laser scanning microscopy. The sorption process mechanism was evidenced on the basis of kinetic, thermodynamic and equilibrium studies. To highlight this, the influence of solution pH, temperature and gold initial concentration on maximum sorption capacity was studied. The obtained experimental data were modeled using Langmuir, Freundlich and Sips sorption isotherms, and it was observed that the Sips one was better for describing the studied sorption process. Kinetic data were fitted using pseudo-first-order and pseudo-second-order kinetic models. Of these models, the studied process was better described by the pseudo-second-order model. The thermodynamic parameters free Gibbs energy (ΔG0), enthalpy (ΔH0), and entropy (ΔS0) were evaluated on the basis of the van’t Hoff equation. On the basis of the thermodynamic study, it was concluded that gold recovery on coP-TEDMA/EGDMA is a spontaneous and endothermic process. View Full-Text
Keywords: diluted waste solution; gold recovery; sorption; sorption mechanism diluted waste solution; gold recovery; sorption; sorption mechanism
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MDPI and ACS Style

Negrea, A.; Ronka, S.; Ciopec, M.; Duteanu, N.; Negrea, P.; Mihailescu, M. Kinetics, Thermodynamics and Equilibrium Studies for Gold Recovery from Diluted Waste Solution. Materials 2021, 14, 5325. https://doi.org/10.3390/ma14185325

AMA Style

Negrea A, Ronka S, Ciopec M, Duteanu N, Negrea P, Mihailescu M. Kinetics, Thermodynamics and Equilibrium Studies for Gold Recovery from Diluted Waste Solution. Materials. 2021; 14(18):5325. https://doi.org/10.3390/ma14185325

Chicago/Turabian Style

Negrea, Adina, Sylwia Ronka, Mihaela Ciopec, Narcis Duteanu, Petru Negrea, and Maria Mihailescu. 2021. "Kinetics, Thermodynamics and Equilibrium Studies for Gold Recovery from Diluted Waste Solution" Materials 14, no. 18: 5325. https://doi.org/10.3390/ma14185325

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