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采用简便的一步水热方法合成磁性壳聚糖纳米复合物(Fe_3O_4-CS MNPs)。用透射电子显微镜、红外光谱仪、热重分析仪、多功能振动样品磁强计对其进行了表征,并通过紫外可见吸收光谱考察了其对甲基橙染料的吸附行为。结果表明,磁性壳聚糖纳米复合物对甲基橙染料的吸附遵循二级反应动力学和Freundlich吸附模型。最大吸附量为93.84mg/g。吸附后的磁性壳聚糖纳米复合物可通过NaOH溶液进行脱附,脱附率为92.98%,且4次吸附-脱附行为后,吸附量仍能达到77.04mg/g,表明该吸附剂具有良好的循环利用能力。
Magnetic chitosan nanocomposites (Fe_3O_4-CS MNPs) were synthesized by a simple hydrothermal method. The samples were characterized by transmission electron microscopy, infrared spectroscopy, thermogravimetric analysis and multi-functional vibrational sample magnetometer. The adsorption behavior of methyl orange dye by UV-visible absorption spectroscopy was investigated. The results show that the magnetic chitosan nanocomposite adsorption of methyl orange dye follows the second order kinetics and the Freundlich adsorption model. The maximum adsorption capacity was 93.84mg / g. The adsorbed magnetic chitosan nanocomposite can be desorbed by NaOH solution with a desorption rate of 92.98%. After 4 adsorption-desorption behaviors, the adsorption capacity still reached 77.04 mg / g, indicating that the adsorbent has Good recycling ability.