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An extraction of Th(IV) was performed using 1- methylimidazole (1-MIM) or 2-methylimidazole (2-MIM) as the extractant in imidazolium type ionic liquids (ILs) or  n -pentanol. The extractability for Th 4+  in ILs was by far higher than that obtained in  n -pentanol. The extraction mechanism was determined by slope analysis and ESI-MS. The transfer of Th 4+  with MIM into ILs proceeded through both a cationic exchange and a neutral solvation mechanism, whereas the partitioning of Th 4+  with MIM into  n -pentanol only underwent a neutral solvation mechanism. The thermodynamic parameters values (Δ H , Δ S  and Δ G ) for extraction of Th 4+  with 1-MIM in IL were calculated and the results indicated the extraction reaction was spontaneous and went through endothermic process. Separation of Th 4+  from the solution of lanthanides (III) and uranium was also carried out by 1-MIM in ILs and  n -pentanol.

Solvent extraction of Th(IV) from aqueous solution with methylimidazole in ionic liquid