论文部分内容阅读
利用化学共沉淀法制备四氧化三铁磁性纳米粒子,依次用正硅酸乙酯(TEOS)和3-氨丙基三乙氧基硅烷(APTES)进行表面修饰,制备了表面氨基化改性的Fe3O4/SiO2复合粒子;采用红外(IR)、扫描电镜(TEM)、振动样品磁强计(VSM)、热综合分析仪(TGA)、X射线粉末衍射分析(XRD)对其结构进行表征。结果表明,氨基化改性Fe3O4/SiO2复合磁性粒子的粒径在500 nm,饱和磁化强度为26.54 emu/g。对水溶液中铀(VI)的最佳吸附条件为:吸附温度35℃,吸附时间30 min,pH为4.5,复合材料用量为0.1 g,在此条件下,对铀酰离子的平衡吸附率为98%。方法简单,吸附后的复合磁性材料可方便地进行富集和回收。
The magnetic iron oxide nanoparticles were prepared by chemical coprecipitation method, followed by surface modification with tetraethoxysilane (TEOS) and 3-aminopropyltriethoxysilane (APTES) to prepare surface-aminated modified Fe3O4 / SiO2 composite particles. The structure was characterized by IR, TEM, VSM, TGA and XRD. The results showed that the particle size of amination modified Fe3O4 / SiO2 composite magnetic particles was at 500 nm and the saturation magnetization was 26.54 emu / g. The optimal adsorption conditions for uranium (VI) in aqueous solution were as follows: adsorption temperature 35 ℃, adsorption time 30 min, pH 4.5 and composite dosage 0.1 g. The equilibrium adsorption rate of uranyl ion was 98 %. The method is simple and the composite magnetic material after adsorption can be conveniently enriched and recovered.