硅藻土复合磁性壳聚糖对铬（VI）离子吸附性能研究

Study Adsorption Performance of Diatomite composite Magnetic Chitosan Material on Chromium (VI) Ion

摘要:

以硅藻土、壳聚糖和四氧化三铁为原料，而硅藻土相比于其他吸附材料较廉价，制备硅藻土复合磁性壳聚糖材料，研究了对铬(VI)离子的吸附性能，同时考虑了影响吸附的主要因素，并研究了动力学、热力学和等温模型。实验结果表明，低温有利于吸附，溶液pH为3，温度为15C，达到吸附平衡时，吸附量为47.8mg/g；对等温模型进行拟合，更符合Langmuir模型，动力学符合准二级动力学模型，热力学分析表明，此吸附为放热反应。在吸附材料吸附饱和后，可以采用氢氧化钠进行再生利用。

Abstract:

Using diatomite, chitosan and Fe3O4 as starting materials, a new low cost diatomite composite magnetic chitosan material was prepared by a simple method and studied for removal of Cr (VI) from waste water. Studied the effects of various parameters and studied adsorption kinetics, thermodynamic and isothermal model. The experimental results show that the adsorption capacity using diatomite composite magnetic chitosan material could reach 47.8mg/g at the best conditions, the situation is 15℃, pH=3, it is conducive to the adsorption at low temperature. Fitting the isothermal model, the Langmuir model provided well correlations of the experimental data, and kinetic data was well fitted by the pseudo-second-order model, the thermodynamics parameters of adsorption system indicated exothermic process. And the adsorbent can be recovered by adding NaOH solution after saturation.