Chemistry Department, Faculty of Science, Mansoura University, Egypt.
Colloids Surf B Biointerfaces. 2012 Jun 1;94:250-8. doi: 10.1016/j.colsurfb.2012.01.051. Epub 2012 Feb 13.
The adsorption of Cu(II), Cd(II) and Ni(II) ions from aqueous solution by cross-linked magnetic chitosan-2-aminopyridine glyoxal Schiff's base resin (CSAP) was studied in a batch adsorption system. Cu(II), Cd(II) and Ni(II) removal is pH dependent and the optimum adsorption was observed at pH 5.0. The adsorption was fast with estimated initial rate of 2.7, 2.4 and 1.4 mg/(g min) for Cu(2+), Cd(2+) and Ni(2+) respectively. The adsorption data could be well interpreted by the Langmuir, Freundlich and Temkin model. The maximum adsorption capacities obtained from the Langmuir model were 124±1, 84±2 and 67±2 mg g(-1) for Cu(2+), Cd(2+) and Ni(2+) respectively. The adsorption process could be described by pseudo-second-order kinetic model. Thermodynamic parameters revealed the feasibility, spontaneity and exothermic nature of adsorption. The sorbents were successfully regenerated using EDTA and HCl solutions.
在批式吸附系统中研究了交联磁性壳聚糖-2-氨基吡啶乙二醛希夫碱树脂（CSAP）对水溶液中 Cu(II)、Cd(II)和 Ni(II)离子的吸附。Cu(II)、Cd(II)和 Ni(II)的去除与 pH 值有关，在 pH 值为 5.0 时观察到最佳吸附。吸附速度很快，Cu(2+)、Cd(2+)和 Ni(2+)的初始估计速率分别为 2.7、2.4 和 1.4 mg/(g min)。吸附数据可以很好地用 Langmuir、Freundlich 和 Temkin 模型解释。从 Langmuir 模型获得的最大吸附容量分别为 124±1、84±2 和 67±2 mg g(-1)用于 Cu(2+)、Cd(2+)和 Ni(2+)。吸附过程可以用拟二级动力学模型来描述。热力学参数表明吸附是可行的、自发的和放热的。用 EDTA 和 HCl 溶液成功地对吸附剂进行了再生。
