Galhoum Ahmed A, Mafhouz Mohammad G, Abdel-Rehem Sayed T, Gomaa Nabawia A, Atia Asem A, Vincent Thierry, Guibal Eric
Ecole des mines d'Alès, Centre des Matériaux des Mines d'Alès, 6 avenue de Clavières, F-30319 Alès cedex, France.
Nuclear Materials Authority, P.O. Box 530, El-Maadi, Cairo, Egypt.
Nanomaterials (Basel). 2015 Feb 4;5(1):154-179. doi: 10.3390/nano5010154.
Cysteine-functionalized chitosan magnetic nano-based particles were synthesized for the sorption of light and heavy rare earth (RE) metal ions (La(III), Nd(III) and Yb(III)). The structural, surface, and magnetic properties of nano-sized sorbent were investigated by elemental analysis, FTIR, XRD, TEM and VSM (vibrating sample magnetometry). Experimental data show that the pseudo second-order rate equation fits the kinetic profiles well, while sorption isotherms are described by the Langmuir model. Thermodynamic constants (ΔG°, ΔH°) demonstrate the spontaneous and endothermic nature of sorption. Yb(III) (heavy RE) was selectively sorbed while light RE metal ions La(III) and Nd(III) were concentrated/enriched in the solution. Cationic species RE(III) in aqueous solution can be adsorbed by the combination of chelating and anion-exchange mechanisms. The sorbent can be efficiently regenerated using acidified thiourea.
合成了半胱氨酸功能化的壳聚糖磁性纳米基颗粒，用于吸附轻、重稀土（RE）金属离子（La(III)、Nd(III)和Yb(III)）。通过元素分析、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、透射电子显微镜（TEM）和振动样品磁强计（VSM）对纳米尺寸吸附剂的结构、表面和磁性进行了研究。实验数据表明，准二级速率方程能很好地拟合动力学曲线，而吸附等温线可用朗缪尔模型描述。热力学常数（ΔG°、ΔH°）表明吸附具有自发性和吸热性。Yb(III)（重稀土）被选择性吸附，而轻稀土金属离子La(III)和Nd(III)在溶液中被浓缩/富集。水溶液中的阳离子稀土物种RE(III)可通过螯合和阴离子交换机制的结合被吸附。该吸附剂可用酸化硫脲高效再生。
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