Abstract
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.
Highlights
Noble metals present a large number of applications in different fields, including as catalysts for chemical and electrochemical processes, for production of electronic devices, as an anticorrosive layer, and in jewelry production [1,2,3,4,5].Global gold resources are decreasing [6], so in this context, it is important to recover gold from different wastes
This study aims to establish the gold sorption mechanism on the newly synthesized material: 2,20 -thiobisethanol dimethacrylate/ethylene glycol dimethacrylate from industrial solutions
We studied the influence of pH on the gold sorption process with respect to the obtained sorbent material
Summary
Noble metals present a large number of applications in different fields, including as catalysts for chemical and electrochemical processes, for production of electronic devices, as an anticorrosive layer, and in jewelry production [1,2,3,4,5].Global gold resources are decreasing [6], so in this context, it is important to recover gold from different wastes (solid wastes or liquid waste solutions from electroplating industry). Noble metals present a large number of applications in different fields, including as catalysts for chemical and electrochemical processes, for production of electronic devices, as an anticorrosive layer, and in jewelry production [1,2,3,4,5]. Among all of the well-known recovery methods, in the case of gold recovery, the best results are obtained when using oxidation, reduction, precipitation, membrane filtration, ionic exchange and adsorption [1]. Among all of these recovery methods, sorption is the most efficient one, and has the lowest operating cost. Due to the possibility of forming specific interactions between such polymeric resins and metallic ions, such sorbents present a higher selectivity. The main advantage of such polymeric resins is that they can be regenerated and reused
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