物理化学学报 >> 2006, Vol. 22 >> Issue (11): 1342-1346.doi: 10.1016/S1872-1508(06)60067-3

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羧甲基化壳聚糖- Fe3O4纳米粒子的制备及对Zn2+的吸附行为

周利民;黄一平;刘峙嵘;黄群武   

  1. 天津大学化工学院,天津 300072;东华理工学院核资源与环境教育部重点实验室, 江西 抚州 344000
  • 收稿日期:2006-04-04 修回日期:2006-07-03 发布日期:2006-11-06
  • 通讯作者: 周利民 E-mail:minglzh@sohu.com

Carboxymethyl Chitosan-Fe3O4 Nanoparticles : Preparation and Adsorption Behaviors towards Zn2+

ZHOU Li-Min;WANG Yi-Ping;LIU Zhi-Rong;HUANG Qun-Wu   

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China; Key Laboratory of Nuclear Resources and Environment, Ministry of Education, East China Institute of Technology, Fuzhou 344000, P. R. China
  • Received:2006-04-04 Revised:2006-07-03 Published:2006-11-06
  • Contact: ZHOU Li-Min E-mail:minglzh@sohu.com

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摘要： 以共沉淀法制备纳米Fe3O4, 通过在颗粒表面接枝羧甲基化壳聚糖(CMC), 制备一种新型磁性纳米吸附剂, 用透射电镜(TEM)、X射线衍射分析(XRD)等对其进行了表征, 并考察了吸附剂对Zn2+的吸附性能. 结果表明, 制备的磁性纳米吸附剂平均粒径18 nm, 粒子中CMC的含量约5%. 该吸附剂对Zn2+吸附速率很快, 在2 min内基本达到平衡, 能有效去除Zn2+. 等温吸附数据符合Langmuir模型, 饱和吸附容量为20.4 mg•g−1, 吸附常数为0.0314 L•mg−1. 热力学计算表明吸附为放热过程, 焓变为−5.68 kJ•mol−1.

关键词: 纳米吸附剂, 羧甲基化壳聚糖, Fe3O4, Zn2+

Abstract: A novel magnetic nanoadsorbent was prepared by the covalent binding of carboxymethyl chitosan (CMC) onto the surface of Fe3O4 magnetic nanoparticles, which was developed using a coprecipitation method. This nanoadsorbent was characterized by transmission electron microscopy (TEM) and X-ray diffraction patterns (XRD), etc. Moreover, the adsorption performance of the nanoadsorbent towards Zn2+ ions was investigated. The results showed that the mean diameter of the magnetic nanoadsorbent was 18 nm and the amount of CMC was about 5%. The nanoadsorbent showed high efficiency for the removal of Zn2+ ions. The adsorption rate was so rapid that the equilibrium was achieved within 2 min. The isotherm adsorption data obeyed the Langmuir model, with a maximum adsorption capacity of 20.4 mg•g−1 and an adsorption equilibrium constant of 0.0314 L•mg−1. The thermodynamic calculation indicated that the adsorption process was exothermic and the enthalpy change was -5.68 kJ•mol−1.

Key words: Nanoadsorbent, Carboxymethyl chitosan, Fe3O4, Zn2+ion