物理化学学报 >> 2007, Vol. 23 >> Issue (12): 1979-1984.doi: 10.3866/PKU.WHXB20071228

研究简报 上一篇    下一篇

改性磁性壳聚糖微球对Cu2+、Cd2+和Ni2+的吸附性能

周利民; 王一平; 黄群武; 刘峙嵘   

  1. 天津大学化学化工学院, 天津 300072; 东华理工大学核资源与环境教育部重点实验室, 江西 抚州 344000
  • 收稿日期:2007-07-02 修回日期:2007-07-24 发布日期:2007-11-30
  • 通讯作者: 周利民 E-mail:minglzh@sohu.com

Adsorption Properties of Cu2+, Cd2+ and Ni2+ by Modified Magnetic Chitosan Microspheres

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

  1. College of Chemistry and Chemical Engineering, Tianjin University, Tianjin 300072, P. R. China; Key Laboratory of Nuclear Resources and Environment of the Education Ministry, East China Institute of Technology, Fuzhou 344000, Jiangxi Province, P. R. China
  • Received:2007-07-02 Revised:2007-07-24 Published:2007-11-30
  • Contact: ZHOU Li-Min E-mail:minglzh@sohu.com

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摘要： 用反相乳液分散-化学交联方法, 制备了粒径为50-80 滋m的Fe3O4/壳聚糖磁性微球, 经乙二胺改性, 用于吸附重金属离子, 考察了改性磁性壳糖微球(EMCS)对Cu2+、Cd2+和Ni2+的吸附性能. 结果表明, 随着溶液pH值的升高, Cu2+和Ni2+的吸附容量增加, Cd2+吸附容量最佳pH值为3；吸附等温数据符合Langmuir模型, EMCS对Cu2+、Cd2+、Ni2+的饱和吸附容量分别为54.3、20.4、12.4 mg·g-1；吸附动力学数据用拟二级反应模型能很好地拟合. 经乙二胺改性的Fe3O4/壳聚糖磁性微球在实验pH值范围内对Cu2+的吸附选择性高于Cd2+和Ni2+.

关键词: 壳聚糖, 乙二胺, 金属离子, 吸附, 动力学

Abstract: Fe3O4/ chitosan magnetic microspheres of 50 to 80 滋m were prepared using the inverse phase emulsion dispersion and chemical crosslinking technology, and then modified with ethylenediamine for use in the adsorption of heavy metal ions. The adsorption properties of the modified Fe3O4/chitosan toward Cu2+, Cd2+ and Ni2+ were investigated. It was found that the adsorption capacities of Cu2+ and Ni2+ increased with pH, and a maximum adsorption for Cd2+ occurred at pH=3. The saturated adsorption capacities calculated by Langmuir isotherms were 54.3 mg·g-1 for Cu2+, 20.4 mg·g-1 for Cd2+, and 12.4 mg·g-1 for Ni2+, respectively. The adsorption kinetics were well described by pseudo-second-order equation models. The experimental results showed that the Fe3O4/chitosan modified with ethylenediamine presented higher adsorption selectivity for Cu2+ than for Cd2+ and Ni2+ in all studied pH ranges.

Key words: Chitosan, Ethylenediamine, Metal ions, Adsorption, Kinetic