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논문 기본 정보

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학술저널
저자정보
Galhoum, Ahmed A. (Centre des Materiaux des Mines d'Ales, Ecole des mines d'Ales) Mahfouz, Mohammad G. (Nuclear Materials Authority) Atia, Asem A. (Chemistry Department, Faculty of Science, Menoufia University) Gomaa, Nabawia A. (Nuclear Materials Authority) Abdel-Rehem, Sayed T. (Chemistry Department, Faculty of Science, Ain Shams University) Vincent, Thierry (Centre des Materiaux des Mines d'Ales, Ecole des mines d'Ales) Guibal, Eric (Centre des Materiaux des Mines d'Ales, Ecole des mines d'Ales)
저널정보
테크노프레스 Advances in environmental research Advances in environmental research 제5권 제1호
발행연도
2016.1
수록면
1 - 18 (18page)

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Magnetic nano-based sorbents have been synthesized for the recovery of two rare earth elements (REE: Nd(III) and Yb(III)). The magnetic nano-based particles are synthesized by a one-pot hydrothermal procedure involving co-precipitation under thermal conditions of Fe(III) and Fe(II) salts in the presence of chitosan. The composite magnetic/chitosan material is crosslinked with epichlorohydrin and modified by grafting alanine and serine amine-acids. These materials are tested for the binding of Nd(III) (light REE) and Yb(III) (heavy REE) through the study of pH effect, sorption isotherms, uptake kinetics, metal desorption and sorbent recycling. Sorption isotherms are well fitted by the Langmuir equation: the maximum sorption capacities range between 9 and 18 mg REE $g^{-1}$ (at pH 5). The sorption mechanism is endothermic (positive value of ${\Delta}H^{\circ}$) and contributes to increase the randomness of the system (positive value of ${\Delta}S^{\circ}$). The fast uptake kinetics can be described by the pseudo-second order rate equation: the equilibrium is reached within 4 hours of contact. The sub-micron size of sorbent particles strongly reduces the contribution of resistance to intraparticle diffusion in the control of uptake kinetics. Metal desorption using acidified thiourea solutions allows maintaining sorption efficiency for at least four successive cycles with limited loss in sorption capacity.

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