Carboxymethyl Chitosan-Fe3O4 Nanoparticles: Preparation and Adsorption Behavior toward Zn2+ Ions |
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| Authors: | Limin Zhou Yiping Wang Zhirong Liu Qunwu Huang |
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| Affiliation: | 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China;2. 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 coprecipitating method. This nanoadsorbent was characterized by transmission electron microscopy (TEM) and X-ray diffraction patterns (XRD), etc. Moreover, the adsorption performance of the nanoadsorbent toward 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 calculations indicated that the adsorption process was exothermic and that the enthalpy change was ?5.68 kJ·mol?1. |
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| Keywords: | Nanoadsorbent Carboxymethyl chitosan Corresponding author. Tel: +86794-8808495 |
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