氨基化改性Fe_3O_4/SiO_2复合磁性材料的制备以及对铀(Ⅵ)的吸附研究  

Preparation and adsorption of uranyl(Ⅵ) of amino-modified magnetic Fe_3O_4/SiO_2 composite materials

作　　者：胡建邦[1] 袁亚莉[1] 唐琼[1] 黄芬[1] 陈杭[1] 马丹丹[1] 高阳阳[1] 李乐[1] 梁俊[1] 

机构地区：[1]南华大学化学化工学院,湖南衡阳421001

出　　处：《应用化工》2012年第12期2067-2070,2074,共5页Applied Chemical Industry

基　　金：湖南省自然科学基金(12JJ6014)

摘　　要：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。Magnetic Fe3O4 nanoparticles are synthesized in chemical co-precipitation, amino-modified magnetic Fe3 O4/SIO2 composite materials were obtained through adding SiO2 and APTES into F%O4 nan- oparticles,the structure of modified Fe304/SiO2 composite materials by amino groups were characterized by infrared absorption spectrum （IR） and transmission electron microscopy （TEM） and vibrating speci- men magnetometer （VSM） and hot integrated analyzer （TGA） and the X-ray diffraction （XRD）. The re sults indicated that the size and the saturation magnetization of the composite materials were 500 nm and 26.54 emu/g, respectively. The aqueous solution of uranium best adsorption conditions were as follows： adsorption temperature of 35 ℃; adsorption time of 30 min ,pH of 4.5, composite materials of 0.1 g, in this condition, the balance of the uranyl ion adsorption rate were 98%. Meanwhile, the magnetic composite materials can be recycled and enriched easily.

关 键 词：铀(VI) Fe304 SI02 吸附 氨基化 

分 类 号：O615.1[理学—无机化学]