中文摘要：

采用水热方法分别合成了Fe304磁性内核以及Fe304@c粒子．并原位合成了Fe304@C／Pt复合纳米结构，采用SEM，TEM红外光谱，Raman光谱等手段进行了相关表征．研究了纯Pt纳米粒子以及Fe304@C／Pt复合纳米结构催化硼氢化钠（NaBH4）还原对硝基苯酚（4-NP）的反应活性，并利用外加磁场富集的方式对该复合纳米结构催化剂进行回收和循环利用．研究结果表明Fe304@C／Pt复合纳米结构的催化性能较纯Pt纳米粒子高，这主要由于Fe304的协同效应所致．即Fe304和Pt间的电荷转移致使Pt的催化活性提高．该复合型催化剂可实现回收和循环利用，其可循环利用次数约为20次．

英文摘要：

Magnetic Fe304 and Fe304@C core-shell nanostructures were prepared by the hydrothermal method and the Pt nanoparticles was in situ attached on Fe304@C to form Fe304@C/Pt nanocomposite. The TEM, SEM, FTIR and Raman spectroscopy were employed to characterize the surface morphology and composition. The catalytic activities of pure Pt nanoparticles （2 nm） and Fe304@C/Pt on the reaction of the transformation of 4-nitrophenol to 4-aminophenol in the presence of NaBH4 were investigated. The possibility of recycling on the catalyst was explored by applying an external magnetic field. The results revealed that Fe304@C/Pt exhibited higher catalytic efficiency than that of pure Pt nanoparticles. It was mainly due to the synergetic effect that occurred at the interface of metals and Fe304@C support. The charge transfer from magnetic core to the Pt caused the increase of electron density on Pt and thus improved the reducibility of Fe304 @C/Pt. The nanocomposite catalyst was recyclable for about 20 times.