Radionuclide extraction with different ionic liquids

Abstract

10 ionic liquids based on 3 different cations and 5 anions were investigated for radionuclide extraction from aqueous solutions. While uranium and 210 Po were extracted with satisfying yields irrespective of the feed solution pH, 234 Th, 226 Ra and 210 Pb extraction yields were rather low. The contact time necessary for near to complete extraction was determined as well as the conditions for successful back-extraction. The loading capacities of the ionic liquids for uranium were very high and depended on the uranyl counter-ion. From the leaching of the ionic liquids into the aqueous phase the predominant extraction mechanisms were derived.

The dialkylcarbonate route to ionic liquids: purer, safer, greener?

“…58,59 Using benzoate-derived or thioglycolate anions, Scheiflinger et al sought to remove radionuclides from aqueous solutions and found good yields for U and 210 Po, irrespective of the pH of the solutions, though low yields were reported for 234 Th, 226 Ra, and 211 Pb (Table 2, entry 5). 60…”

“…58,59 Using benzoate-derived or thioglycolate anions, Scheiflinger et al sought to remove radionuclides from aqueous solutions and found good yields for U and 210 Po, irrespective of the pH of the solutions, though low yields were reported for 234 Th, 226 Ra, and 211 Pb (Table 2, entry 5). 60 Mishra et al 48 tion of TiO 2 nanoparticles. 61,62 Commercially available methylvinyl-imidazolium hydrogenocarbonate and methylcarbonate were used to form ion pairs through acid/base neutralisation with benzenesulfonic, tosylic, triflic, methanesulfonic, and acetic acids.…”

Advanced Uranium Removal with Pure, Nonfluorinated Ionic Liquids: Fine-Tuning Hydrophilic and Hydrophobic Properties for Enhanced Selectivity

“…14 This adaptability makes it feasible to substitute conventional volatile organic solvents in extraction and separation processes. 15,16 In the past decade, ILs have been extensively tested as environmentally friendly organic solvents for the removal and recovery of actinide metals, with a particular focus on uranium, from ores, 17,18 wastewater, 19,20 and the postprocessing of spent nuclear fuel. 21−24 The critical process of extracting uranium from these matrices is essential to prevent its dissemination into natural environments and reduce related hazards.…”

“…In the past decade, ILs have been extensively tested as environmentally friendly organic solvents for the removal and recovery of actinide metals, with a particular focus on uranium, from ores, , wastewater, , and the postprocessing of spent nuclear fuel. − The critical process of extracting uranium from these matrices is essential to prevent its dissemination into natural environments and reduce related hazards. Previous studies have emphasized the robust radiolytic stability of ILs with incorporating aromatic rings or chromophore groups. , Moreover, it has been shown that hydrophobic fluorinated ILs serve as effective solvents for the extraction of uranyl cations (UO 2 2+ ) from water.…”