Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (12): 1979-1984.doi: 10.3866/PKU.WHXB20071228

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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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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