Understanding the extraction mechanism, radiolytic stability and stripping behavior of thorium by ionic liquid based solvent systems: evidence of 'ion-exchange' and 'solvation' mechanism

Singh Manpreet; Sengupta Arijit<sup>*</sup>; Jayabun Sk; Ippili Tejaswi

doi:10.1007/s10967-016-4994-z

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Understanding the extraction mechanism, radiolytic stability and stripping behavior of thorium by ionic liquid based solvent systems: evidence of 'ion-exchange' and 'solvation' mechanism

作者：Singh Manpreet; Sengupta Arijit^*; Jayabun Sk; Ippili Tejaswi

来源：Journal of Radioanalytical and Nuclear Chemistry, 2017, 311(1): 195-208.

DOI：10.1007/s10967-016-4994-z

摘要

The extraction efficiency for thorium followed the trend: Cyanex-923 > Cyanex-272 > DHOA > TBP. In case of TBP and DHOA the extraction proceeded via 'solvation mechanism' through Th(NO3)(4)center dot 2L, while for Cyanex-923 and Cyanex-272 it proceeded via 'ion exchange' mechanism through (Th(NO3)(2)center dot 2L)(2+). The extraction process followed slower kinetics while change in Gibb's energy revealed the spontaneity of the process. These ionic liquid based systems were found to be radiolytically stable, highly efficient and selective for Th. Oxalic acid was found to be suitable for almost quantitative stripping of Th from extracted ionic liquid phase.