Dy(III) recovery from dilute solutions using magnetic-chitosan nano-based particles grafted with amino acids

作者: Ahmed A. Galhoum , Asem A. Atia , Mohammad G. Mahfouz , Sayed T. Abdel-Rehem , Nabawia A. Gomaa

DOI: 10.1007/S10853-015-8845-Z

关键词:

摘要: Magnetic-chitosan nano-based particles were successfully prepared by a simple one-pot co-precipitation method before being functionalized with three different amino acid groups (i.e., alanine, serine, and cysteine) using epichlorohydrin as the linking agent. The structural functional characteristics of nanosorbents investigated elemental analysis, Fourier transform infrared spectrometer, X-ray diffraction, TEM, vibrating sample magnetometry. sorption properties these materials tested for Dy(III) recovery from aqueous solution: pH effect, uptake kinetics, isotherms investigated. Sorbent are super-paramagnetic their size is in range 15–40 nm. Kinetic profiles modeled pseudo second-order rate equation. Langmuir Dubinin–Radushkevich equations fit well-sorption isotherms. maximum capacities at 5 (optimum pH, T: 27 ± 1 °C) close to 14.8, 8.9, 17.6 mg Dy g−1 cysteine type, respectively. Cationic species RE(III) solution appear be sorbed combined chelation anion-exchange mechanisms. process begins low-metal concentration physical monolayer low ion metal ions can higher coordination. values thermodynamic parameters ΔG° ΔH° indicate spontaneous endothermic nature mechanism, while positive ΔS° show that during randomness increases. Finally, sorbent efficiently regenerated acidified thiourea: amount hardly reduced, least first four sorption/desorption cycles.

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