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Nouveaux systèmes complexants sélectifs d'ions métalliques supportés

Abstract : The aim of the present work is dedicated to the valorization of calix[4]arene derivatives as transition-metal selective extraction agents, immobilized onto natural polymers (cellulose) or artificial (polystyrenic resins). We have elaborated a multi-step synthesis strategy, allowing the introduction of bipyridine units (2 or 3) on the lower rim and the incorporation of an amine spacer arm dedicated to grafting. Metal/Ligand stoechiometries studies in solution were undertaken by UV-Visible spectroscopy.Then, the ligands obtained were grafted onto PS-DVB resins functionnalized with aldehyde groups (Wang) or cholomethylene groups (Merrifield), and onto natural polymer (cotton). The grafting rates were determined by UV-Visible spectroscopy and ionic chromatography. Their extractive capacities were studied in aqueous/organic media, firstly for monometallic solutions then for more complex mixtures.The last part of our work was dedicated to the separation of a ternary mixture Ag/Zn/Pb, which could have an economic interest. A solid-liquid extraction process was developped, integrating recyclability and stability studies. The effective separation of these 3 metal ions was proved.
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Yannick de Gaetano. Nouveaux systèmes complexants sélectifs d'ions métalliques supportés. Autre. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10029⟩. ⟨tel-01748660⟩

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