A molecular extraction process for vanadium based on tandem selective complexation and precipitation

Oluwatomiwa A. Osin, Shuo Lin, Benjamin S. Gelfand, Stephanie Ling Jie Lee, Sijie Lin and George K. H. Shimizu ()
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Oluwatomiwa A. Osin: University of Calgary
Shuo Lin: University of Calgary
Benjamin S. Gelfand: University of Calgary
Stephanie Ling Jie Lee: Tongji University
Sijie Lin: Tongji University
George K. H. Shimizu: University of Calgary

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Recycling vanadium from alternative sources is essential due to its expanding demand, depletion in natural sources, and environmental issues with terrestrial mining. Here, we present a complexation-precipitation method to selectively recover pentavalent vanadium ions, V(V), from complex metal ion mixtures, using an acid-stable metal binding agent, the cyclic imidedioxime, naphthalimidedioxime (H2CIDIII). H2CIDIII showed high extraction capacity and fast binding towards V(V) with crystal structures showing a 1:1 M:L dimer, [V2(O)3(C12H6N3O2)2]2−, 1, and 1:2 M:L non-oxido, [V(C12H6N3O2)2] ̶ complex, 2. Complexation selectivity studies showed only 1 and 2 were anionic, allowing facile separation of the V(V) complexes by pH-controlled precipitation, removing the need for solid support. The tandem complexation-precipitation technique achieved high recovery selectivity for V(V) with a selectivity coefficient above 3 × 105 from synthetic mixed metal solutions and real oil sand tailings. Zebrafish toxicity assay confirmed the non-toxicity of 1 and 2, highlighting H2CIDIII’s potential for practical and large-scale V(V) recovery.

Date: 2024
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DOI: 10.1038/s41467-024-46958-6

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