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Achieving selective U(VI) and Pu(VI) extraction from acidic waste: Robust polyethersulfone composite beads with tailored ligands.

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Title: Achieving selective U(VI) and Pu(VI) extraction from acidic waste: Robust polyethersulfone composite beads with tailored ligands.
Authors: Guchhait, Satya Ranjan1,2 (AUTHOR), Banerjee, Piyali1,2 (AUTHOR), Karak, A.1 (AUTHOR), Patra, Kankan1,2 (AUTHOR), Singh, Gitender1 (AUTHOR), Sengupta, Arijit2,3 (AUTHOR), Sarathi, Partha1 (AUTHOR), Valsala, T.P.1 (AUTHOR), Sathe, D.B.1 (AUTHOR), Bhatt, R.B.1 (AUTHOR), Singh, D.K.2,4 (AUTHOR), Yadav, Kartikey K.2,4 (AUTHOR) yadavkk@barc.gov.in
Source: Separation Science & Technology. 2026, Vol. 61 Issue 3-5, p470-490. 21p.
Subjects: Polyethersulfone, Plutonium, Phosphines, Radiation damage, Composite materials, Metal ion absorption & adsorption, Waste treatment
Abstract: Polyethersulfone (PES)-based composite beads encapsulated with phosphorus-based ligands, namely, Tri-n-butyl phosphate (TBP), Di-2-ethylhexylphosphoric acid (DEHPA) and (TBP+DEHPA) were synthesized, and the encapsulation of the ligands in the beads was confirmed by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). These beads were employed for the extraction of Am (III), Pu(VI) and U (VI) from nitric acid feed solution. The extraction trend was U (VI) > Pu(VI)> Am (III). The attainment of the equilibrium for the metal ion extraction was within 10 min, and the data are in line with the pseudosecond-order kinetics and Elovich model. The uptake capacity for Pu(VI) was 253.8 mg/g for the mixed composite beads (containing TBP+DEHPA). The metal ion sorption followed the monolayer chemisorption phenomenon. The sorption process was endothermic in nature. The beads, exposed with 500 kGy 60Co gamma radiation, showed minimum effect on the extraction. The effect of the irradiation on the mixed beads was explored on the basis of the extraction efficiency, the kinetics and the reusability. The experimental outcomes reinforce that the polymeric composite beads can be employed for selective extraction of hexavalent actinides, U(VI) & Pu(VI) over trivalent actinide, Am(III). [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Polyethersulfone (PES)-based composite beads encapsulated with phosphorus-based ligands, namely, Tri-n-butyl phosphate (TBP), Di-2-ethylhexylphosphoric acid (DEHPA) and (TBP+DEHPA) were synthesized, and the encapsulation of the ligands in the beads was confirmed by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). These beads were employed for the extraction of Am (III), Pu(VI) and U (VI) from nitric acid feed solution. The extraction trend was U (VI) > Pu(VI)> Am (III). The attainment of the equilibrium for the metal ion extraction was within 10 min, and the data are in line with the pseudosecond-order kinetics and Elovich model. The uptake capacity for Pu(VI) was 253.8 mg/g for the mixed composite beads (containing TBP+DEHPA). The metal ion sorption followed the monolayer chemisorption phenomenon. The sorption process was endothermic in nature. The beads, exposed with 500 kGy 60Co gamma radiation, showed minimum effect on the extraction. The effect of the irradiation on the mixed beads was explored on the basis of the extraction efficiency, the kinetics and the reusability. The experimental outcomes reinforce that the polymeric composite beads can be employed for selective extraction of hexavalent actinides, U(VI) & Pu(VI) over trivalent actinide, Am(III). [ABSTRACT FROM AUTHOR]
ISSN:01496395
DOI:10.1080/01496395.2025.2486249