Abstract
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 pH4 (maximum sorption capacity close to 185mgUg−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 (10–50nm) allows reducing the impact of resistance to intraparticle diffusion on uptake kinetics and the equilibrium contact time is close to 45–60min. 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 (0.5M, pH>2) and the sorbents can be recycled for at least 5/6cycles with a limited loss of sorption capacity (<9%).
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