Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
J Hazard Mater. 2012 Mar 30;209-210:240-9. doi: 10.1016/j.jhazmat.2012.01.015. Epub 2012 Jan 11.
In this study, cross-linked magnetic chitosan-phenylthiourea (CSTU) resin were prepared and characterized by means of FTIR, (1)H NMR, SEM high-angle X-ray diffraction (XRD), magnetic properties and thermogravimetric analysis (TGA). The prepared resin were used to investigate the adsorption properties of Hg(II), Cd(II) and Zn(II) metal ions in an aqueous solution. The extent of adsorption was investigated as a function of pH and the metal ion removal reached maximum at pH 5.0. Also, the kinetic and thermodynamic parameters of the adsorption process were estimated. These data indicated that the adsorption process is exothermic and followed the pseudo-second-order kinetics. Equilibrium studies showed that the data of Hg(II), Cd(II) and Zn(II) adsorption followed the Langmuir model. The maximum adsorption capacities for Hg(II), Cd(II) and Zn(II) were estimated to be 135 ± 3, 120 ± 1 and 52 ± 1 mg/g, which demonstrated the high adsorption efficiency of CSTU toward the studied metal ions.
在这项研究中，通过傅里叶变换红外光谱（FTIR）、（1）H 核磁共振（NMR）、扫描电子显微镜（SEM）高角度 X 射线衍射（XRD）、磁性能和热重分析（TGA）等手段制备并表征了交联磁性壳聚糖-苯硫脲（CSTU）树脂。研究了该树脂在水溶液中对 Hg(II)、Cd(II)和 Zn(II)金属离子的吸附性能。考察了吸附程度随 pH 值的变化，在 pH 值为 5.0 时，金属离子的去除率达到最大值。此外，还估算了吸附过程的动力学和热力学参数。这些数据表明，吸附过程是放热的，并遵循拟二级动力学。平衡研究表明，Hg(II)、Cd(II)和 Zn(II)吸附的数据遵循朗缪尔模型。Hg(II)、Cd(II)和 Zn(II)的最大吸附容量估计分别为 135±3、120±1 和 52±1mg/g，这表明 CSTU 对研究金属离子具有较高的吸附效率。
