Abstract
The effects of residual water and oxygen on the electrochemical processing step for the recovery of extracted into the hydrophobic ionic liquids, tri-1-butylmethylammonium bis((trifluoromethyl)sulfonyl)imide or -methyl--propylpiperidinium bis((trifluoromethyl)sulfonyl)imide containing the lipophilic ionophore, calix[4]arene-bis(-octylbenzo-crown-6) from simulated aqueous tank waste was investigated in the presence of residual water and oxygen. The electrochemical reduction of ionophore-bound at Hg electrodes is surprisingly tolerant of small amounts of water, but greatly affected by oxygen. However, sparging with dry lowers the residual water and oxygen content of the extraction solvent to the level where the reduction of at Hg is possible. Thus, the entire treatment cycle for the removal of from tank waste using a hydrophobic ionic liquid can be carried out in an open cell, provided that the cell is sparged with dry . was found to be a better extraction solvent for than , but the former solvent was unstable toward metallic Cs and/or .
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