The magnetic Fe₃O₄/activated carbon nanocomposites with high surface area were synthetized as recoverable adsorbents by chemical binding of Fe₃O₄ nanoparticles on activated carbon (AC) powders. The component AC and Fe₃O₄ in this nanocomposite possesses amorphous non-graphitic structure and cubic crystal structure, respectively. All composite samples presented superparamagnetic properties. The saturation magnetization of Fe₃O₄/AC nanocomposites was significantly lower than that of bare Fe₃O₄ particles, indicating that Fe₃O₄ particles were truly attached on AC surface. The microstructure image indicated that the Fe₃O₄ particles were uniformly dispersed on AC surface and thus maintained high specific surface area. The adsorption capacity of methyl orange (MO) at 30 °C slightly decreased from 384 mg/g on AC powders to 324 mg/g on Fe₃O₄/AC nanocomposites, which was reduced by 15% after magnetic fabrication. It was found that MO adsorption on Fe₃O₄/AC nanocomposites followed the pseudo-second order kinetic model and the isotherms could be described by the Langmuir model. The easy recovery of magnetic adsorbents from aqueous solution demonstrated their application potential to remove toxic pollutants in water and wastewater treatment.

通过将Fe ₃ O ₄纳米颗粒与活性炭（AC）粉末化学键合，将具有高表面积的磁性Fe ₃ O ₄ /活性炭纳米复合材料合成为可回收的吸附剂。该纳米复合材料中的组分AC和Fe ₃ O _4分别具有非晶非石墨结构和立方晶体结构。所有复合样品均表现出超顺磁性。Fe ₃ O ₄ / AC纳米复合材料的饱和磁化强度明显低于裸Fe ₃ O ₄颗粒，表明Fe ₃ O ₄颗粒确实附着在AC表面上。显微组织图像表明，Fe ₃ O ₄颗粒均匀地分散在交流表面上，因此保持了较高的比表面积。在30°C下，甲基橙（MO）的吸附容量从AC粉末上的384 mg / g略降至Fe ₃ O ₄ / AC纳米复合材料上的324 mg / g，在磁性制造后降低了15％。发现MO在Fe ₃ O ₄上的吸附/ AC纳米复合材料遵循伪二级动力学模型，等温线可以用Langmuir模型描述。从水溶液中轻松回收磁性吸附剂证明了其在水和废水处理中去除有毒污染物的应用潜力。