采用水热法合成了水溶性儿茶素功能化的Fe3O4纳米粒子。通过傅立叶变换红外光谱、X射线光电子能谱、原子力显微镜、X射线衍射和磁性测试对制备的Fe3O4纳米复合材料进行了表征。结果表明,Fe3O4纳米粒子具有立方尖晶石结构,表面覆盖着儿茶素。儿茶素功能化Fe3O4纳米粒子具有很强的磁性,可以利用永磁体进行收集。所得的Fe3O4纳米粒子具有良好的稳定性,并可以在水中重新分散。在此基础上,实验了儿茶素功能化Fe3O4纳米颗粒吸附水中的重金属离子效果。原子吸收测定结果表明,儿茶素功能化Fe3O4纳米粒子对水中Cu2+、Cd2+和Pb2+的去除率很高,有望应用于废水中重金属离子的处理。
Catechin-functionalized Fe3O4 nanoparticles were synthesized via a hydrothermal approach.The obtained Fe3O4 nanocomposites were characterized by fourier transform infrared spectroscopy (FT-IR),hysteresisloop,atomic force microscope(AFM),and X-ray diffraction (XRD).The results revealed that the Fe3O4 nanoparticles had cubic spinel structure and capped by catechin outside.In addition,the catechin-functionalized Fe3O4 nanoparticles had strong magnetic properties,and can be manipulated by a permanent magnet.The obtained Fe3O4 nanoparticles were quite stable and can be re-dispersed in water.Furthermore,the catechin-functionalized Fe3O4 nanoparticles can be utilized to adsorb the heavy metal ions in water.The primary results indicated that the catechin-functionalized Fe3O4 nanoparticles had high removal rate for Cu2+,Cd2+ and Pb2+ in water.Taken together,the catechin-functionalized Fe3O4 nanoparticles were expected to be applied in the removal of heavy metal ions in wastewater.
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