Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (11): 1342-1346.doi: 10.1016/S1872-1508(06)60067-3

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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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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