Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (11): 1342-1346.doi: 10.1016/S1872-1508(06)60067-3
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ZHOU Li-Min;WANG Yi-Ping;LIU Zhi-Rong;HUANG Qun-Wu
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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 mg8226;g8722;1 and an adsorption equilibrium constant of 0.0314 L8226;mg8722;1. The thermodynamic calculation indicated that the adsorption process was exothermic and the enthalpy change was -5.68 kJ8226;mol8722;1.
Key words: Nanoadsorbent, Carboxymethyl chitosan, Fe3O4, Zn2+ion
ZHOU Li-Min;WANG Yi-Ping;LIU Zhi-Rong;HUANG Qun-Wu. Carboxymethyl Chitosan-Fe3O4 Nanoparticles : Preparation and Adsorption Behaviors towards Zn2+[J].Acta Phys. -Chim. Sin., 2006, 22(11): 1342-1346.
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URL: http://www.whxb.pku.edu.cn/EN/10.1016/S1872-1508(06)60067-3
http://www.whxb.pku.edu.cn/EN/Y2006/V22/I11/1342
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