Separation and purification of gadolinium, terbium and dysprosium by P204-P507 solvent impregnated resin in nitric acid system

•The adsorption capacity of Tb(III) can reach 156.44 µg/g.•The adsorption kinetic data indicate that the pseudo-second-order kinetic model is more applicable.•The isothermal data exhibit a strong correlation with the Freundlich model.•The oxygen atoms in the phosphate groups act as ligands, particip...

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Vydáno v:Journal of molecular liquids Ročník 427; s. 127473
Hlavní autoři: Ma, Fuqiu, Zhang, Wenxue, Xu, Zhiyu, Yang, Dacan, Wang, Guixiang
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier B.V 01.06.2025
Témata:
DFT
Dysprosium
Gadolinium
P204-P507
Separation
Terbium
P204-P507
Gadolinium
Terbium
Separation
DFT
Dysprosium
ISSN:0167-7322
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Shrnutí:•The adsorption capacity of Tb(III) can reach 156.44 µg/g.•The adsorption kinetic data indicate that the pseudo-second-order kinetic model is more applicable.•The isothermal data exhibit a strong correlation with the Freundlich model.•The oxygen atoms in the phosphate groups act as ligands, participating in coordination bonding. In recent years, the 161Tb nuclide has garnered increasing attention, particularly in the field of medical radiopharmaceuticals, due to its favorable characteristics, including a suitable half-life of 6.9 days, low-energy β particles (βav = 154 keV), Auger electrons(≤40 keV), and accompanying gamma radiation. Additionally, it exhibits coordination properties and in vivo behavior akin to that of 177Lu.This paper aims to investigate the separation and purification of the medical isotope 161Tb. The mixed solution containing Gd(III), Tb(III), and Dy(III) ions was used to simulate the solution of the irradiated target. The mass ratio of Gd(III), Tb(III), and Dy(III) was 1000: 1: 1. The static adsorption experiment was carried out by P204-P507 resin. The effects of initial solution acidity, solid–liquid ratio and contact time on the adsorption performance and the effect of desorption agent acidity on the desorption effect of Tb(III) were investigated. The experimental results show that P204-P507 has the best adsorption effect under 0.01 mol/L nitric acid. The adsorption capacity of Tb(III) can reach 156.44 μg/g when the solid–liquid ratio is 100 mg/mL and the adsorption time is 180 min. The desorption effect is the best when 1 mol/L nitric acid is used as the desorption agent of Tb(III). The resin was analyzed using characterization techniques such as SEM, FT-IR, and XPS. The adsorption kinetic data indicate that the pseudo-second-order kinetic model is more applicable, while the isothermal data correlate well with the Freundlich model. Finally, the complexation mechanism of the P204-P507 dual extractant with Tb was analyzed through theoretical calculations. The results show that each dimer forms an eight-membered ring with Tb(III), with a minimum adsorption energy of −0.383 Kcal/mol. The adsorption process is accompanied by charge transfer. Therefore, this study provides theoretical support and practical evidence for the effective separation of Gd(III), Tb(III), and Dy(III) using P204-P507 dual extractant impregnated resin.
ISSN:0167-7322
DOI:10.1016/j.molliq.2025.127473