In this work, we used the modified Hummers method to synthesize graphene oxide, and the redox reaction of FeCl[Formula: see text]H2O with the carboxyl group on the surface of acidified graphene was carried out to prepare magnetic nanoparticles modified on the surface of graphene (magnetic graphene nanocomposite). X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Vibrating Sample Magnetometer (VSM) and Brunauer–Emmett–Teller measurement (BET) analyses were used to characterize the nanocomposite properties. SEM and TEM images of the nanocomposite show that the magnetic nanoparticles are distributed on both sides of the graphene, and the magnetic nanoparticles diameter is between 100 and 150[Formula: see text]nm. The XRD pattern indicates that the magnetic nanoparticles are Fe3O4 nanoparticles. Based on the VSM, the nanocomposite exhibits a saturation magnetization value of 14.94[Formula: see text][Formula: see text]. By BET measurement, the specific surface area of the nanocomposite is 26.54[Formula: see text]m[Formula: see text], and the surface of the nanocomposite is highly porous. In the experiment of dyes adsorption, the adsorption efficiency in the solution was close to 100%. It can be applied in biomedical and environmental fields such as water purification owing to its high surface, magnetic attraction properties and good adsorption efficiency.

中文翻译：

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磁性纳米粒子改性石墨烯的制备及吸附性能

在这项工作中，我们使用改进的 Hummers 方法合成了氧化石墨烯，以及 FeCl2 的氧化还原反应[分子式：见正文]H2将O与酸化石墨烯表面的羧基进行氧化制备石墨烯表面改性的磁性纳米粒子（磁性石墨烯纳米复合材料）。X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、振动样品磁强计 (VSM) 和 Brunauer-Emmett-Teller 测量 (BET) 分析用于表征纳米复合材料的性质。纳米复合材料的SEM和TEM图像显示磁性纳米粒子分布在石墨烯的两侧，磁性纳米粒子直径在100-150[公式：见正文]nm之间。XRD图表明磁性纳米颗粒是Fe3○4纳米粒子。基于 VSM，纳米复合材料的饱和磁化强度值为 14.94[公式：见正文][公式：见正文]。通过BET测量，纳米复合材料的比表面积为26.54[公式：见正文]m[公式：见正文]，纳米复合材料的表面是高度多孔的。在染料吸附实验中，溶液中的吸附效率接近100%。由于其高表面、磁吸引特性和良好的吸附效率，可应用于生物医学和环境领域，例如水净化。