Adsorption of uranium(VI) from aqueous solution using magnetic carboxymethyl chitosan nano-particles functionalized with ethylenediamine

The magnetic carboxymethyl chitosan nano-particles functionalized with ethylenediamine (EDA-MCCS) was synthesized for U(VI) adsorption. The EDA-MCCS showed high affinity and fast kinetic for U(VI) adsorption. The adsorption kinetic could be interpreted by the pseudo-second-order equation. The adsorption isotherm fitted well with the Langmuir equation, with the maximum sorption capacity of 175.4 mg g(-1) at 25 degrees C and pH 4.5. Thermodynamic parameters indicated the exothermic and spontaneous nature of U(VI) adsorption. The EDA-MCCS could be successfully regenerated using 0.20 M EDTA-0.10 M HNO3 as the eluent.