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Extraction of Uranium from Aqueous Solution of Nitric Acid and Organic Solvent Using Ionic Liquid

https://doi.org/10.14233/ajchem.2021.22916
Pradeep Kumar
Department of Chemical Engineering, Institute of Engineering and Technology, Lucknow-226021, India
Ashok Khanna
Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India

Corresponding Author(s) : Pradeep Kumar

pradeepkumar@ietlucknow.ac.in

Asian Journal of Chemistry, Vol. 33 No. 1 (2021): Vol 33 Issue 1

Abstract

In present study, tri-n-butylphosphate (TBP), a classical complexing agent for metallic cations, has been studied for the extraction of uranium into ionic liquids (ILs): 1-butyl-3-methylimidazolium-bis( tri-fluoromethylsulfonyl)imide ([BMIM][TF2N]) and trihexyl-tetradecylphosphonium-bis(tri-fluoromethylsulfonyl) imide ([P(14)666][TF2N]). Increasing HNO3 acidity of aqueous solution from 0.01 to 1 M the distribution ratio, DU decreases from 16 to 1.2 for 1.1 M TBP in [BMIM][TF2N] and the corresponding extraction efficiency (% E) varies from ~94 to 55. In the acidic range of 1 to 8 M DU and % E shows reversal trend of giving a local maximum at 8 M. This behaviour is compared and validates by literature. In contrast, on increasing in aqueous acidity from 0.01 to 8 M the extraction of uranium into [P(14)666][TF2N] ionic liquid, DU enhances from 2 to 39 and (%E) goes up from ~ 51 to 95. Since, [P(14)666][TF2N] works better than [BMIM][TF2N] in the acidic range > 0.1. This ionic liquid has been used for selective separation of uranium from strontium giving a DU of 63 and DSr of 2 with 98% E of uranium at 8 M acidity. To confirm the various species and groups in the formed complex, FTIR studies have been conducted.

Keywords

Distribution ratio Extraction efficiency Ionic liquid Tributyl phosphate Solvent extraction
Kumar, P., & Khanna, A. (2020). Extraction of Uranium from Aqueous Solution of Nitric Acid and Organic Solvent Using Ionic Liquid. Asian Journal of Chemistry, 33(1), 43–48. https://doi.org/10.14233/ajchem.2021.22916
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