2005•Huaxue Shijie (Chemical World)Requires access
Preparation and Adsorptive Characteristic of Chitosan Loaded on Bentonite
Weijun Liu
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Abstract
A novel adsorbent matrial based on chitosan loaded on bentonite (Bent-CTS) was prepared. IR spectra show that the adsorption of bentonite for chitosan attributes to chemical bonding. SEM images indicate that the shape of the adsorbent is nearly spherical with a diameter of 50～80 μm and chitosan is loaded on bentonite homogeneously. The BET surface area of Bent-CTS is about 15.2 m2/g. Bent-CTS exhibits the best adsorption capacity for Ni 2+ and Pb 2+ at pH6.5 and pH6.0 and the saturation capacities are 1.87 and 1.99 mmol/g, respectively. At the same time, the equilibrium isotherms for adsorption are correlated to the Langmuir equation and Freundlich equation. The saturation adsorption capacity of Bent-CTS is almost unchanged after regeneration for several times.