Abstract
The overall goal of our research program is to design, synthesize and evaluate organic chelators for the specific binding/removal of actinides in a variety of environmentally relevant situations. Such chelators would be useful to selectively remove actinide ions such as plutonium from a variety of waste forms including soils and waste streams. We have identified a new class of polyhydroxamates as potential chelating agents for actinides based on computer modeling, solubility properties and other important features including ease of synthesis. Several members of this class of tetrahydroxamate chelators have been synthesized in our laboratory and evaluated for the binding of actinides and other metal ions in solution. Some of the hydroxamate chelators that we have developed have also been evaluated for their plutonium(IV) binding and the results are very encouraging. Detailed studies of the complexation behavior of this class of chelators are currently in progress and the goal of these experiments is to develop an understanding of the efficiency and nature of the metal complexation chemistry. This in turn should allow the further modification of this class of chelators to obtain agents with higher specificity for the actinide ions.
Another major goal of this program is to develop polymer supported, ion specific extraction systems for removing actinides and other hazardous metal ions from wastewaters. Selected ligands from our ongoing efforts are being incorporated into polymeric backbones to be evaluated for their abilities to selectively remove the target metal ions from process waste streams. The synthesis of some chelating polymers and results of their preliminary evaluation are described.
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The effect of metal ion hydrolysis on the shapes of these titration curves has not yet been determined.
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Gopalan, A. et al. (1995). Synthesis and Evaluation of Polyhydroxamate Chelators for Selective Actinide Ion Sequestration. In: Nash, K.L., Choppin, G.R. (eds) Separations of f Elements. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1406-4_7
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DOI: https://doi.org/10.1007/978-1-4899-1406-4_7
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