Abstract: Magnetic illite composite was synthesized by chemical co-precipitation and its sorption behavior was investigated. Magnetic illite composite was characterized by Fourier transfer infrared (FTIR)，scanning electron microscope (SEM) and vibrating sample magnetometer (VSM). The sorption behavior of magnetic illite for Co(Ⅱ) was studied as a function of solid content，contact time，pH and temperature. The Lagrange pseudo-second order kinetic model，Langmuir isotherm and Freundlich equation were used to fit the data. The results manifested that magnetic illite composite was successfully obtained. Sorption was strongly affected by pH and temperature. The sorption of magnetic illite for Co(Ⅱ) was found to follow the Lagrange pseudo-second-order kinetic model. With respect to thermodynamics，sorption of Co(Ⅱ) increased with increasing temperature and fitted the Langmuir isotherm.

Key words: magnetic composite, sorption, cobalt(Ⅱ), kinetics, thermodynamics

摘要： 采用化学共沉淀法制备了磁性伊利石复合材料，并对其吸附性能进行研究。首先利用红外光谱（FTIR）、场发射扫描电镜（SEM）和振动样品磁强计（VSM）对磁性伊利石进行表征，然后研究了吸附剂浓度、吸附时间、pH值和温度对Co(Ⅱ)在磁性伊利石上吸附的影响，并采用Lagrange准二级动力学方程、Langmuir等温线方程及Freundlich等温线方程对实验数据进行拟合。结果表明：Fe3O4纳米粒子成功地复合在了伊利石表面；pH值和温度对Co(Ⅱ)在伊利石上的吸附影响较大；Co(Ⅱ)在磁性伊利石上的吸附符合Lagrange准二级动力学方程；热力学符合Langmuir等温线方程，并且高温利于吸附。

关键词: 磁性复合材料, 吸附, Co(Ⅱ), 动力学, 热力学