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Studies on the extraction of Cs(I) from nitric acid medium were carried out using three commercial calix-crown ligands,  viz . calix[4]arene-bis-crown-6, calix[4]arene-bis-1,2-benzocrown-6 and calix[4]arene-bis-2,3-naphthocrown-6 dissolved in different room temperature ionic liquids (RTILs),  viz.  1-butyl-3-methyl-imidazolium hexafluorophosphate (C 4 mim·PF 6 ), 1-hexyl-3-methyl-imidazolium hexafluorophosphate (C 6 mim·PF 6 ) and 1-octyl-3-methyl-imidazolium hexafluorophosphate (C 8 mim·PF 6 ). The distribution ratio of Cs(I) decreased with increased alkyl chain length of RTILs. The effect of nitric acid concentration on distribution behaviour of Cs(I) by calix[4]arene-bis-1,2-benzocrown-6 was investigated. The extraction of Cs(I) from HNO 3  was found to be exothermic and extraction was found to be enthalpy driven. Selective extraction of Cs(I) could be achieved from a mixt ure of various fission product elements like Tc, Mo, Zr, Ce, Ru, La, Ba, and Sr.

Extraction of caesium(I) from HNO 3 medium using room temperature ionic liquid containing calix[4]crown ligands as the selective extractants