2008•Separation Science and TechnologyRequires access
Can Kosmotropic Salt/Chaotropic Ionic Liquid (Salt/Salt Aqueous Biphasic Systems) be Used to Remove Pertechnetate From Complex Salt Waste?
Nicholas J. Bridges, Robin Don Rogers
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Abstract
Aqueous solutions of water‐structuring, kosmotropic salts (e.g., salts of PO4 3−, HPO4 2−, CO3 2−) will salt‐out water‐destructuring chaotropic ionic liquids (ILs) (e.g., 1‐butyl‐3‐methylimidazolium chloride, ([C4mim]Cl)) forming salt/salt aqueous biphasic systems (ABS). The chaotropic pertechnetate (TcO4 −) anion will partition without the use of an extractant into the IL‐rich phase. These complex salt/salt ABS are not unlike the complex and salt‐rich Hanford tank waste, and thus have been used here as a simple model to show effectiveness in the partitioning of TcO4 − from such tank waste into an IL‐rich phase.