氨基化磁性纳米粒子的制备及其对Pb2+吸附性能研究

摘要

采用改进的高温分解法制备单分散 Fe3 O4纳米粒子,以正硅酸乙酯为硅源在其表面包覆 SiO2,以N-氨乙基-γ氨丙基三甲氧基硅烷为改性剂对复合粒子进行表面氨基化修饰,制备出氨基化磁性复合纳米粒子 Fe3 O4@SiO2-NH2。利用红外光谱(FT-IR)、透射电镜(TEM)、X 射线衍射(XRD),振动样品磁强计(VSM)等手段对复合粒子进行了表征,并研究其作为吸附剂在不同条件下对 Pb2+的吸附性能。表征结果显示,所制备的复合粒子具有核壳结构,粒径均匀大约在50nm,粒子表面拥有丰富的氨基功能基团；复合粒子饱和磁化强度为69.50A·m2/kg,具有超顺磁性。吸附实验表明所制备的氨基化磁性复合纳米粒子对Pb2+具有较大的吸附容量,是一种能够有效处理含铅废水的吸附材料。%Fe3 O4 nanoparticles were prepared through thermal decomposition method and coated by SiO2 using ethyl orthosilicate,then grafted N-[3-(trimethoxysilyl)-propyl]-ethylenediamine on the surface to prepare ami-no-functionalized magnetic nano-composite particles Fe3 O4 @SiO2-NH2 .The sample was characterized by TEM,VSM,XRD,FT-IR respectively.The adsorption of Pb2+ from wastewater was also investigated under many different conditions.The results showed that the sample with core-shell structure has uniform size of av-erage 50nm,there are rich amino functional groups on the surface.The result of VSM indicated that the sample was superparamagnetic.The experiments demonstrated the sample have excellent adsorptive capacity of Pb2+, which will be used to deal leaded wastewater as a promising adsorbent.