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

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 (H₂CID^III). H₂CID^III 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 H₂CID^III's potential for practical and large-scale V(V) recovery.

SUBMITTER: Osin OA 

PROVIDER: S-EPMC10960790 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature