Efficient Recovery and Recycling of Rare Earth Elements using Ionic Liquid [Hbet][Tf2N]

Finally, the rare earth elements loaded on the ionic liquid were stripped off using anti-solvent hydrochloric acid and oxalic acid, achieving complete recovery of the rare earth elements and regeneration of the ionic liquid. After regeneration, 'Hbet][Tf2N' could still be used for rare earth element extraction after four cycles, achieving the recycling of 'Hbet][Tf2N'.