Cysteine-Functionalized Chitosan Magnetic Nano-Based Particles for the Recovery of Uranium(VI): Uptake Kinetics and Sorption Isotherms |
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| Authors: | Ahmed A Galhoum Mohammad G Mahfouz Nabawia A Gomaa Sayed S Abdel-Rehem Asem A Atia Thierry Vincent |
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| Affiliation: | 1. Nuclear Materials Authority, El-Maadi, Cairo, Egypt;2. Ecole des mines d’Alès, Centre des Matériaux des Mines d’Alès, Alès cedex, France;3. Department of Chemistry, Faculty of Science, Ain Shams University, Egypt;4. Department of Chemistry, Faculty of Science, Menoufia University, Shebin El-Kom, Egypt;5. Ecole des mines d’Alès, Centre des Matériaux des Mines d’Alès, Alès cedex, France |
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| Abstract: | Magnetic-chitosan nanoparticles, functionalized with cysteine, were synthesized and characterized by element analysis, FT-IR, XRD, TEM, and vibrating sample magnetometry. The sorbent was tested for U(VI) recovery, considering: a. pH effect, b. sorption isotherms (fitted by Langmuir equation), and c. uptake kinetics (modeled using the PSORE).
Maximum sorption capacity approached 100 mg U g?1. The nanometric size of sorbent reduces the impact of resistance to intraparticle diffusion; this may explain the fast kinetics (equilibrium within 50 min). The reaction is exothermic, spontaneous. The metal could be desorbed using acidified urea solution and the sorbent could be recycled for 5 cycles. |
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| Keywords: | Cysteine-functionalized chitosan uranium(VI) magnetic chitosan nano-based particles sorption isotherm uptake kinetics |
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