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采用共沉淀法制备了磁性四氧化三铁(Fe3O4)纳米粒子,并通过硅烷偶联剂对其表面进行改性,进一步在其表面偶联修饰氨基硫脲,制备了螯合磁性纳米Fe3O4粒子。利用广角X射线衍射仪(WAXD)、红外光谱仪(FTIR)、分光光度计等对磁性纳米粒子的结构和性能进行了表征。结果表明,纳米Fe3O4为反尖晶石结构,通过偶联修饰可以实现氨基硫脲在纳米粒子表面的化学改性。螯合磁性纳米粒子具有良好的分散性和磁响应性,且对多种金属离子(Pb2+、Hg2+、Zn2+、Cd2+)具有良好的螯合效果。
Magnetic iron oxide (Fe3O4) nanoparticles were prepared by coprecipitation, and their surface was modified by silane coupling agent. The chelating magnetic nano-Fe3O4 particles were prepared by the coupling modification of thiosemicarbazone on the surface. The structure and properties of magnetic nanoparticles were characterized by wide angle X-ray diffraction (WAXD), infrared spectroscopy (FTIR) and spectrophotometer. The results show that the nano-Fe3O4 is anti-spinel structure, and the chemical modification of thiosemicarbazone on the surface of the nano-particles can be achieved by coupling modification. Chelated magnetic nanoparticles have good dispersibility and magnetic response, and have good chelating effect on a variety of metal ions (Pb2 +, Hg2 +, Zn2 +, Cd2 +).