Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Int J Biol Macromol. 2012 Apr 1;50(3):773-81. doi: 10.1016/j.ijbiomac.2011.11.026. Epub 2011 Dec 6.
A chitosan-thioglyceraldehyde Schiff's base cross-linked magnetic resin (CSTG) was prepared and characterized using various instrumental methods. Then, the prepared resin was used for comparative studies on the removal of toxic metal ions like: Hg(2+), Cu(2+) and Zn(2+) from aqueous solutions. The effects of the initial pH value of the solution, contact time, the initial metal ion concentration and temperature on the adsorption capacity of the composite were investigated. The kinetics data were analyzed by pseudo-first order and pseudo-second order equations. The adsorption kinetics was well described by the pseudo-second order equation, and the adsorption isotherms were better fitted by the Langmuir equation. The maximum theoretical adsorption capacities of the CSTG resin for Hg(2+), Cu(2+) and Zn(2+) were found to be 98±2, 76±1 and 52±1 mg g(-1), respectively. The negative values of Gibbs free energy of adsorption (ΔG(ads°) indicated the spontaneity of the adsorption of all metal ions on the novel resin.
一种壳聚糖-硫代甘油醛希夫碱交联磁性树脂（CSTG）被制备并通过各种仪器方法进行了表征。然后，将制备的树脂用于从水溶液中去除有毒金属离子如 Hg(2+)、Cu(2+)和 Zn(2+)的对比研究。考察了溶液初始 pH 值、接触时间、初始金属离子浓度和温度对复合材料吸附能力的影响。动力学数据通过拟一级和拟二级方程进行分析。吸附动力学很好地符合拟二级方程，吸附等温线更符合朗缪尔方程。CSTG 树脂对 Hg(2+)、Cu(2+)和 Zn(2+)的最大理论吸附容量分别为 98±2、76±1 和 52±1mg g(-1)。吸附的吉布斯自由能（ΔG(ads°）为负值表明所有金属离子在新型树脂上的吸附是自发的。
