中空碳纳米棒负载Fe_3O_4的制备及催化性能研究

Synthesis of hollow carbon nanorods supported Fe_3O_4 and their catalytic properties

以商用Fe_2O_3纳米棒为前驱体,利用溶胶凝胶法一步完成了二氧化硅和间苯二酚-甲醛树脂壳层的包覆,在5%氢气气氛下,同时实现了三氧化二铁的还原和树脂的碳化,最终以NaOH溶液刻蚀掉二氧化硅,成功制备了中空碳纳米棒负载Fe_3O_4材料(Fe_3O_4@h-C)。结果表明,所制备的Fe_3O_4@h-C结构完整,Fe_3O_4的负载量较高,为62.6%,其比饱和磁化强度高达58.5 emu/g,易于回收再利用。该材料在H_2O_2氧化亚甲基蓝的实验中表现出良好的催化活性和重复使用性。通过对比实验可以证明,中空结构对催化性能的提升起到了重要作用。

Hollow carbon nanorods supported Fe3O4(Fe3O4@h-C)were prepared using commercial Fe2O3 nanorods as starting material,which were coated with both silica and resorcinol-formaldehyde resin layers in one-pot,with the reduction of the Fe2O3 nanorods and carbonization of the resin layer achieved by heat treatment in 5%H 2 atmosphere.The results showed that the Fe3O4@h-C nanorods had an intact structure,high Fe3O4 loading of 62.6%and a large saturation magnetization of 58.5 emu/g,making them easy to recycle.The as-prepared Fe3O4@h-C nanorods exhibited good catalytic activity and reusability in catalytic oxidation of methylene blue by H2O2.By conducting control experiments,it was confirmed that the hollow structure played an important role in enhancing the catalytic performance.