核壳Fe3O4@NiSiO3磁性微纳米材料的合成及其吸附性能研究与表征

Preparation and adsorption characterization of Fe3O4@NiSiO3 micro/nano composite

通过改进的凝胶-溶胶法和溶剂热法合成核壳结构Fe3O4@NiSiO3磁性复合微纳米材料,对其结构和性能进行了SEM分析、TEM分析、多晶X射线衍射分析、磁性分析、比表面积及孔结构分析。以亚甲基蓝为模拟吸附染料,探究其吸附的机理和动力学吸附行为;并优化了亚甲基蓝浓度、吸附剂用量、pH值、溶液温度和平衡时间等实验条件。结果表明,复合材料对亚甲基蓝具有良好的吸附性能,吸附率达到98.5%;符合Langmuir吸附等温式且吸附动力学符合二级动力学方程。

The core shell structure Fe3O4@NiSiO3 magnetic composite micro-nanomaterials were synthesized by improved Stober sol-gel method and solvothermal method. The structure and properties of Fe3O4@NiSiO3 magnetic composite micro-nanomaterials were characterized by a series of characterization tests, such as SEM analysis, TEM analysis, polycrystalline X-ray diffraction analysis, magnetic analysis, specific surface area and pore structure analysis. Methylene blue was used as simulated adsorption dye to study its adsorption mechanism and dynamic adsorption behavior. The experimental condition, such as inial MB concentration, pH, solution temperature and balance time was optimized. The results show that the composite microspheres had good adsorption capacity with an adsorption rate of 98.5%. And it fitted the pseudo-second-order kinetics model and the Langmuir isotherm model.