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制备用于吸附重金属离子的磁性纳米伊/蒙黏土
作者:刘婷婷 潘志东 黎振源 王燕民 
单位:华南理工大学材料科学与工程学院 广州 510640 
关键词:磁铁矿 伊/蒙黏土 重金属离子 吸附 
分类号:TQ424.2
出版年,卷(期):页码:2017,45(1):29-36
DOI:10.14062/j.issn.0454-5648.2017.01.05
摘要:

采用化学共沉淀法原位制备了一种可便于磁性回收并吸附水中重金属离子(如Pb2+)的磁性纳米伊/蒙黏土。通过X射线衍射技术、Fourier变换红外光谱仪、场发射扫描电子显微镜、振动样品磁强计对样品进行了表征。结果表明,合成的Fe3O4纳米颗粒可原位复合附着于纳米伊/蒙黏土颗粒表面,使磁性纳米伊/蒙黏土的饱和磁化强度达到26.77 emu/g,并可有效地从浆体中磁分离出来。另外,水中Pb2+离子的吸附研究表明,磁性纳米伊/蒙黏土吸附Pb2+离子的动力学过程符合准二级动力学模型,且pH值和磁性纳米伊/蒙黏土加入量对在浆料中吸附Pb2+离子的效果有着显著的影响。其等温吸附过程符合Langmuir模型,其最大单层饱和吸附量为22.5 mg/g。当pH=6时,Pb2+离子的去除率达97.79%;当磁性纳米伊/蒙黏土加入量为1 g/L时,平衡吸附量为38.7 mg/g。

 

 Magnetic nano–sized illite/smectite(MN–I/S) clay composite was prepared by an in situ chemical co–precipitation method for the adsorption of heavy metal ions (i.e., Pb2+) in aqueous solution. The samples were characterized by X–ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field–emission scanning electron microscopy (FESEM), and vibrating sample magnetometer (VSM), respectively. The results show that the as–synthesized magnetite nanoparticles can attach in situ onto the surface of illite/smectite(I/S) clay, resulting in the MN–I/S clay composite with a saturation magnetization of 26.77 emu·g–1 for subsequent magnetic separation after adsorption of heavy metallic ions in aqueous solution. Furthermore, the prepared MN–I/S clay composite was used to adsorb Pb2+ ions in aqueous solution. It is indicated that pH value and MN–I/S clay addition have dominant effects on the adsorption performance. When pH=6, the removal rate of Pb2+ ions is 97.79%. The equilibrium absorption capacity, qe, is 38.7 mg/g at the MN–I/S clay addition of 1 g/L. In addition, the adsorption process follows the Langmuir isotherms model, and the maximum monolayer adsorption capacity is 22.5 mg/g. The results confirm that the kinetics of adsorbing Pb2+ ions onto the MN–I/S clay follows the pseudo–second order model.

 
基金项目:
中央高校基本科研业务费专项资金(2015ZM102)资助项目
作者简介:
刘婷婷(1991—),女,硕士研究生
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