An efficient route is proposed to synthesize magnetic nitrogen-doped mesoporous carbon (Fe3O4/NMC) composites. The nitrogen-doped mesoporous carbon (NMC) material was prepared using a melamine–formaldehyde resin as nitrogen and carbon source and fumed silica as a template via a template method, and Fe3O4nanoparticles were introduced via an in situ formation method. The effects of the loading amount of Fe3O4on the morphology, structure, magnetic properties and adsorption performance of the Fe3O4/NMC composites were investigated. Fe3O4nanoparticles dispersed well on the surface and inside the NMC, and the Fe3O4/NMC remained a mesoporous structure. Fe3O4/NMC exhibited superparamagnetic behavior, and the maximum saturation magnetization was 30.1[Formula: see text]emu/g. Fe3O4/NMC had a decreased specific surface area and pore volume compared to NMC, but the Fe3O4/NMC composites still showed excellent adsorption capacity for Ag(I), reaching 71.9[Formula: see text]mg/g. The adsorption efficiency of Fe3O4/NMC remained at 90.3% of the initial removal capability after five cycles, which demonstrated the potential large-scale industrial applications of these composites.

中文翻译：

---

含 Fe3O4 的氮掺杂介孔碳作为吸附剂有效去除 Ag(I)

提出了一种合成磁性氮掺杂介孔碳（Fe3○4/NMC) 复合材料。以三聚氰胺-甲醛树脂为氮源和碳源，气相二氧化硅为模板，采用模板法制备了氮掺杂介孔碳（NMC）材料，Fe3○4纳米粒子是通过原位形成方法引入的。Fe负载量的影响3○4Fe的形貌、结构、磁性和吸附性能3○4研究了 /NMC 复合材料。铁3○4纳米粒子很好地分散在 NMC 的表面和内部，而 Fe3○4/NMC 保持中孔结构。铁3○4/NMC表现出超顺磁性，最大饱和磁化强度为30.1[公式：见正文]emu/g。铁3○4/NMC 与 NMC 相比，比表面积和孔容有所降低，但 Fe3○4/NMC复合材料对Ag(I)仍表现出优异的吸附能力，达到71.9[公式：见正文]mg/g。Fe的吸附效率3○4/NMC 在五个循环后保持在初始去除能力的 90.3%，这证明了这些复合材料潜在的大规模工业应用。