(1. 东北师范大学 环境学院，长春 130117；
2. 长春工程学院 水利与环境工程学院，长春 130012；
3. 吉林省林业勘察设计研究院，长春 130022)
摘 要: 以地下水厂含铁污泥为原料，利用一步溶剂热法制备出含有Fe3O4的磁性材料。采用磁学性质测量系统、X射线衍射仪、穆斯堡尔谱仪、X射线光电子能谱仪和扫描电镜对铁泥和磁性材料进行表征。结果表明：地下水厂铁泥含铁量较低(16.6%，质量分数)，其杂质主要是硅和铝矿物，粒径约为70 nm，在磁场下不会迁移；经过溶剂热法处理后，生成含有Fe3O4的椭球形磁性材料，粒径达到1.5 μm，比饱和磁化强度(Ms)可达18.9 A？m2/kg，在磁场下可迅速向磁极迁移并聚集，体现了良好的磁响应特征。磁性材料对水中亚甲基蓝的吸附效果接近粉末活性炭，在5 min内对10 mg/L亚甲基蓝的吸附效率达到92.3%。本研究方法可以处理含铁量较低的铁泥，实现铁泥的资源化利用，制备的磁性材料在染料废水处理中具有潜在的应用价值。
关键字: 四氧化三铁；亚甲基蓝；地下水厂；铁泥；溶剂热法
（1. School of Environment, Northeast Normal University, Changchun 130117, China;
2. College of Water Conservancy and Environmental Engineering,
Changchun Institute of Technology, Changchun 130012, China;
3. Jilin Institute of Forestry Survey and Design, Changchun 130022, China）
Abstract:Magnetic material with ferroferric oxide was synthesized by one-step solvothermal method using iron mud with low-iron-content as the raw material. The obtained magnetic material was characterized by magnetic property measurement system (MPMS), X-ray diffraction (XRD), M？ssbauer spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The results show that the iron content in iron mud is only 16.6% (mass fraction), while the main impurities are silicon and aluminum oxides, iron mud with the average size of 70 nm does not have any magnetism. After solvothermal process, the obtained magnetic material contains ferroferric oxide and assumes a near-sphere shape with the average size of 1.5 μm. The material possesses well magnetic response, and the specific saturated magnetizing strength reaches 18.9 A？m2/kg, which can be easily magnetic separated from water. Dramatically, the adsorptivity of the material is nearly equivalent to powder active carbon, for example, the removal efficiency of methylene blue (10 mg/L) reaches to 92.3% in 5 min, which contributes to the chemical adsorption between the methylene blue and the material. Therefore, this facile solvothermal method can be applied to dispose iron mud with low-iron-content and make the mud into recoverable resource. Moreover, the prepared magnetic material has a potential application on the treatment of dye wastewater.
Key words: Fe3O4; methylene blue; groundwater treatment plant; iron mud; solvothermal synthesis
