磁性壳聚糖的制备及处理亚甲基蓝废水

以戊二醛为交联剂，Fe₃O₄为磁核制备磁性壳聚糖，探究了其去除废水中亚甲基蓝的性能，以及吸附动力学、吸附等温线、吸附热力学特征.结果表明，在磁性壳聚糖投加量为0.5g/L、pH=10、反应时间为60min的条件下，对亚甲基蓝的去除率和吸附容量分别达到97.6%和39.0mg/g，远高于天然壳聚糖的59.8%和23.9mg/g.磁性壳聚糖对亚甲基蓝的吸附过程符合准二级反应动力学方程（R²=0.99902）和Langmuir等温线方程（R²=0.99961），吸附过程是热力学自发过程，吸附反应是放热反应.

Preparation of magnetic chitosan and its application in the treatment of methylene blue wastewater

A magnetic chitosan was prepared by cross linking with glutaraldehyde and Fe₃O₄ for the removal of methylene blue from wastewater. The performance of the magnetic chitosan on methylene blue removal and the characteristics of the adsorption kinetics, isotherms and thermodynamics were investigated. When the magnetic chitosan dose was adjusted to 0.5g/L and the solution pH value was adjusted to 10, after 60 min, removal efficiency of the methylene blue reached 97.6%, and the corresponding adsorption capacity reached 39.0mg/g. Compare to that of 59.8% and 23.9mg/g by the natural chitosan, both removal efficiency and adsorption capacity were improved significantly. Furthermore, the adsorption process of the methylene blue could be well fitted to the pseudo-second-order kinetic model (R²=0.99902) and the Langmuir equilibrium model (R²=0.99961), the adsorption process was a thermodynamic spontaneous process, and the adsorption reaction was an exothermic reaction.