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Article Dans Une Revue Hydrometallurgy Année : 2017

Chemical modifications of chitosan nano-based magnetic particles for enhanced uranyl sorption

Résumé

The grafting of diethylenetriamine (preferentially to the grafting of serine > cysteine > alanine) onto chitosan (immobilized on magnetic nano-based particles by combined polymer precipitation and hydrothermal treatment) allows synthesizing an efficient sorbent for uranyl at pH 4 (maximum sorption capacity close to 185 mg U g(-1)). Sorption isotherm (regardless of the sorbent) is fitted by the Langmuir equation, while uptake kinetics is well described by the pseudo-second order rate equation. The design of nano-based particles (10-50 nm) allows reducing the impact of resistance to intraparticle diffusion on uptake kinetics and the equilibrium contact time is close to 45-60 min. The super paramagnetic properties of the hybrid materials make their solid/liquid separation quite easy using an external magnetic field. Finally uranyl ions can be desorbed using acidic urea solution (0.5 M, pH >2) and the sorbents can be recycled for at least 5/6 cycles with a limited loss of sorption capacity (<9%).
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Dates et versions

hal-02892644 , version 1 (07-07-2020)

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Ahmed A. Galhoum, Mohammad G. Mahfouz, Nabawia M. Gomaa, Thierry Vincent, Eric Guibal. Chemical modifications of chitosan nano-based magnetic particles for enhanced uranyl sorption. Hydrometallurgy, 2017, 168 (SI), pp.127-134. ⟨10.1016/j.hydromet.2016.08.011⟩. ⟨hal-02892644⟩
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