磁性交联壳聚糖的制备及其对钍(Ⅳ)的吸附研究

Preparation of magnetic crosslinking chitosan and adsorption of Th(Ⅳ) ions

以戊二醛为交联剂,将壳聚糖包裹在Fe3O4磁子表面制成磁性壳聚糖(MC)。考察了MC对钍的最佳吸附时间、最佳pH和初始浓度。结果表明:MC对钍有很好的吸附性能,最佳pH为5,浓度为60μg/mL时MC对钍的吸附在7 h达到平衡,吸附量达49.60 mg/g,去除率达90%以上。利用拟一级反应动力学模型和拟二级反应动力学模型对实验数据进行拟合,并分别采用Freundlich模型和Langmuir模型对吸附等温线进行拟合。

Using glutaraldehyde as cross-linking agent,and blending chitosan wrapped in Fe3O4 magneton surface made magnetic chitosan（MC）.Effects of contact time,pH and initial concentration on the adsorption of Th by the magnetic chitosan were investigated.The results showed that the optimum adsorption conditions were as follows： pH 5.0,initial thorium（IV） concentration 60 μg/ml,and adsorption time 7 h,the maximum adsorption capacity of Th was 49.60 mg/g,the removal efficiency was above 90%.The kinetics was evaluated utilizing the pseudo-first-order reaction and pseudo-second-order reaction models,and the adsorption isotherm data were analyzed using the Langmuir,Freundlich isotherm models.