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Acta Phys. -Chim. Sin.  2006, Vol. 22 Issue (11): 1342-1346    DOI: 10.1016/S1872-1508(06)60067-3
Carboxymethyl Chitosan-Fe3O4 Nanoparticles : Preparation and Adsorption Behaviors towards Zn2+
ZHOU Li-Min;WANG Yi-Ping;LIU Zhi-Rong;HUANG Qun-Wu
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
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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 wordsNanoadsorbent      Carboxymethyl chitosan      Fe3O4      Zn2+ion     
Received: 04 April 2006      Published: 06 November 2006
Corresponding Authors: ZHOU Li-Min     E-mail:
Cite this article:

ZHOU Li-Min;WANG Yi-Ping;LIU Zhi-Rong;HUANG Qun-Wu. Carboxymethyl Chitosan-Fe3O4 Nanoparticles : Preparation and Adsorption Behaviors towards Zn2+. Acta Phys. -Chim. Sin., 2006, 22(11): 1342-1346.

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