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Liquid–liquid extraction of neptunium from aqueous acidic solution using quaternary ammonium based task specific ionic liquid (TSIL) was investigated. The extraction of Np was predominated by the ‘cation exchange’ mechanism via [NpO 2 ·Hpth] +  species for NpO 2  2+ , while NpO 2  +  was extracted in ionic liquid as [NpO 2 ·H·Hpth] + . The extraction process was thermodynamically spontaneous while kinetically slower. Na 2 CO 3  as strippant showed quantitative back extraction of neptunium ions from TSIL. TSIL showed excellent radiolytic stability upto 500 kGy gamma exposure. Finally, the TSIL was employed for the processing of simulated high level waste solutions revealing high selectivity of TSIL towards neptunium.

Quaternary ammonium based task specific ionic liquid for the efficient and selective extraction of neptunium