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通过两步水热法合成了Fe_3O_4@NH_2-MOF(Al)磁性纳米复合材料,采用透射电子显微镜、磁性能分析表征手段对合成样品的形貌以及磁性进行了表征。应用其对靛蓝二磺酸钠染料进行吸附,考察了离子强度、pH值、吸附等温线,吸附动力学和吸附热力学的影响。利用再生性这一特征,用不同洗脱剂进行脱附和再利用。试验结果表明,该材料为纳米级,且具备磁性纳米材料优良的物理和化学性质。该材料具有超顺磁性,在外加磁场的作用下可以实现快速分离。动力学试验研究证明吸附过程符合二级动力学拟合模型,吸附为放热过程,并且是自发进行的。对该材料进行了再生性能考察证明,Fe_3O_4@NH_2-MOF(Al)不仅具有较高的吸附能力,而且可以实现重复利用。
The Fe_3O_4 @ NH_2-MOF (Al) magnetic nanocomposites were synthesized by a two-step hydrothermal method. The morphology and magnetic properties of the synthesized samples were characterized by transmission electron microscopy and magnetic property analysis. Adsorption of sodium indigo disulfonate dye was studied. The effects of ionic strength, pH value, adsorption isotherm, adsorption kinetics and adsorption thermodynamics were investigated. Utilizing the regenerative nature of this feature, different eluents are used for desorption and reuse. The experimental results show that the material is nano-scale, and has excellent physical and chemical properties of magnetic nano-materials. The material has superparamagnetism and can be quickly separated under the action of an applied magnetic field. Kinetic experimental studies have shown that the adsorption process accords with the second-order kinetic fitting model, the adsorption is an exothermic process, and spontaneous. The regeneration performance of the material proved that Fe 3 O 4 @ NH_2-MOF (Al) not only has high adsorption capacity, but also can be reused.