Separation of metals from aqueous solutions using polymeric membranes with novel extractants
DOI:
https://doi.org/10.37636/recit.v4299111Keywords:
Membrane efficiency, Permeability, Precious metal separation, Polymeric membranes, Phosphorus carriersAbstract
Gold is a valuable metal. Nowadays, there is interest in the recovery of this metal from primary and secondary sources (electronic waste). Membrane-based separation techniques have become increasingly important because by modifying their physical and chemical properties they result in their ability to separate the analytes of interest. In this work, the efficiency in the separation and recovery of trace gold in 5 M HCl using a polymeric membrane system was studied. For this purpose, membranes with different composition of the polymeric support, plasticizer and carrier were synthesized. The polymer used was cellulose triacetate and as carrier and plasticizer an organic phosphate (tris(2-ethyl-hexyl) phosphate). A two-compartment cell separated by a polymeric membrane and with an agitation of 500 rpm was used. The operating cycle of the system was 180 min. The feed phase contained 0.2 mM gold (III) in a concentrated medium of 5 M hydrochloric acid and as recovery phase a saline solution. The membrane with the highest efficiency presented a carrier composition of 53.3% tris (2-ethyl-hexyl) phosphate. The gold concentration was measured with a UV-Vis spectrophotometer at a wavelength of 313 nm. Gold recovery was observed to be 76% in one cycle of operation. The carrier proved to be efficient for metal recovery in a concentrated 5 M hydrochloric acid medium.
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Copyright (c) 2021 Alfonso Lemus-Solorio, María Elena Núñez-Gaytán, Ana María Núñez-Gaytán, Martha Angélica Lemus-Solorio, Sandra Núñez-Hernández
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