Facile synthesis of a novel covalent triazine framework for recovering gold(i) from thiosulfate solution
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Abstract
In this study, a novel covalent triazine framework (CTF), CTF-MG, was synthesized using a one-step method and used as an adsorbent to recover gold(I) from a thiosulfate solution. CTF-MG exhibited rapid adsorption kinetics for gold, with an equilibrium gold loading capacity of 10.9 mg g−1. The adsorption of gold was observed to be an exothermic process, and the Freundlich isotherm and pseudo-second-order kinetic models were used to describe the adsorption process. NaCl could effectively elute gold from the gold-loaded CTF-MG at a desorption rate of 90%. Even after five adsorption–desorption cycles, the gold recovery rate still remained above 80%. Moreover, 94.18% of gold in a copper–ethylenediamine–thiosulfate actual gold leaching solution was efficiently recovered using CTF-MG within 4 h. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy characterization results revealed that anion exchange interaction is the mechanism of adsorption of gold by CTF-MG. The development of this work provides a reference for new methods to recover gold(I) in a thiosulfate solution.
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