Abstract

LOPEZ-SOLIS, Carmen Lucía et al. Selective gold extraction using membranes based on a new polymeric material with complex active sites. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2020, vol.44, n.172, pp.814-827.  Epub July 24, 2021. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.938.

We synthesized a new organic polymer whose characteristics allow it to act as an extracting agent for metal ions. Membranes were made from polyvinylchloride (PVC) and 2 nitrophenyl octyl ether plasticizer (NPOE) together with the synthesized polymer and were used to extract gold from aqueous solutions of the metal. Additionally, we added sodium tetraphenylborate (Na-TFB) to improve the ion exchange between the working solution and the manufactured membrane. We determined the composition and membrane thickness showing the highest percentage of gold extraction, as well as the material selectivity towards Au3 + in the presence of other metal ions (Cu2+, Pb2+, Ca2+, Zn2+, Fe3+, Ni2+, and Al3+), each with an initial concentration of 1.4x10-4 M. The results showed percentages close to 80% of the initial content of the solution (1x10-4 M) extracted in one cycle; besides we were able to reuse the same membrane during three cycles without appreciable losses of efficiency.

Keywords : Polymer; Membrane; Extraction; Gold.

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