Adsorption of Cu(II), Co(II), and Ni(II) ions by modified magnetic chitosan chelating resin
Adsorption of Cu(II), Co(II), and Ni(II) ions by modified magnetic chitosan chelating resin
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DOI：
10.1016/j.jhazmat.2010.01.012
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发表时间：
2010-05-15
影响因子：
13.6
通讯作者：
Sarhan, A. A.
中科院分区：
文献类型：
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作者：
Monier, M.;Ayad, D. M.;Sarhan, A. A.
制备了交联磁性壳聚糖-靛红席夫碱树脂（CSIS），用于吸附金属离子。采用红外光谱、核磁共振氢谱、广角X射线衍射（WAXRD）、磁性能和热重分析（TGA）等手段对产物进行了表征。研究了交联磁性CSIS树脂对Cu ~（2+）、Co ~（2+）和Ni ~（2+）离子的吸附性能。考察了接触时间、温度、pH值和金属离子初始浓度等因素对吸附行为的影响。采用准一级动力学方程和准二级动力学方程对反应动力学参数进行了评价。平衡数据进行了分析，使用Langmuir，Freundlich和Tempkin等温模型。吸附动力学遵循伪二级方程的机制，所有系统的研究，证明化学吸附的速率限制步骤的吸附机制，不涉及在溶液中的传质。吸附平衡数据符合Langmuir等温式，其对Cu ~（2+）、Co ~（2+）和Ni ~（2+）的最大吸附容量分别为103.16、53.51和40.15 mg/g。交联磁性CSIS在所有pH范围内对Cu 2+表现出更高的吸附容量。随着温度的升高，金属离子的吸附量降低。使用0.01- 0.1M乙二胺四乙酸（EDTA）以大于88%的效率再生负载金属离子的交联磁性CSIS。(C)2010年Elsevier BA/。All rights reserved.
Cross-linked magnetic chitosan-isatin Schiffs base resin (CSIS) was prepared for adsorption of metal ions. CSIS obtained was investigated by means of FTIR, H-1 NMR, wide-angle X-ray diffraction (WAXRD), magnetic properties and thermogravimetric analysis (TGA). The adsorption properties of cross-linked magnetic CSIS resin toward Cu2+, Co2+ and Ni2+ ions were evaluated. Various factors affecting the uptake behavior such as contact time, temperature, pH and initial concentration of the metal ions were investigated. The kinetic parameters were evaluated utilizing the pseudo-first-order and pseudo-second-order. The equilibrium data were analyzed using the Langmuir, Freundlich, and Tempkin isotherm models. The adsorption kinetics followed the mechanism of the pseudo-second-order equation for all systems studied, evidencing chemical sorption as the rate-limiting step of adsorption mechanism and not involving a mass transfer in solution. The best interpretation for the equilibrium data was given by Langmuir isotherm, and the maximum adsorption capacities were 103.16, 53.51, and 40.15 mg/g for Cu2+, Co2+ and Ni2+ ions, respectively. Cross-linked magnetic CSIS displayed higher adsorption capacity for Cu2+ in all pH ranges studied. The adsorption capacity of the metal ions decreased with increasing temperature. The metal ion-loaded cross-linked magnetic CSIS were regenerated with an efficiency of greater than 88% using 0.01-0.1 M ethylendiamine tetraacetic acid (EDTA). (C) 2010 Elsevier BA/. All rights reserved.