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Citation: FAN Zhong-Lei, WANG Ling-Hui, SHEN Jin-Ge. The Adsorption of Zn²⁺ Cations on Ethylenediamine-grafted Silica Gel[J]. Chinese Journal of Applied Chemistry, ;2010, 27(11): 1260-1264. doi: 10.3724/SP.J.1095.2010.00066 shu

The Adsorption of Zn²⁺ Cations on Ethylenediamine-grafted Silica Gel

College of Chemical and Energy, Zhengzhou University, Zhengzhou 450001

Received Date: 26 January 2010
Revised Date: 16 March 2010

Ethylenediamine-grafted silica gel materials(EDA/SiO₂) for the adsorption of Zn²⁺ were prepared with the use of γ-chloropropyltrichlorosilane as coupling reagent and ethylenediamine as a surface-modifying reagent.The adsorption behavior of EDA/SiO₂ for Zn²⁺ and the effects of pH in Zn²⁺ solution,initial concentration,adsorption temperature and time were studied.The experimental results show that the pH value of Zn²⁺ solution affected the adsorption capacity of EDA/SiO₂ significantly,and the suitable pH range was pH 3.0~5.5 for the adsorption of Zn²⁺.The adsorption equilibrium data for Zn²⁺ could be fitted according to the Langmuir model.The results of the thermodynamic parameters of the adsorption of Zn²⁺ on EDA/SiO₂ show that this adsorption is an endothermic spontaneous process and increasing temperature is conducive to the adsorption.An interpretation was given for this,adsorption behavior of Zn²⁺ on EDA/SiO₂.Adsorption kinetic data could be fitted by the pseudo-second-order kinetic equation,and the fitting kinetic constants were related with the initial solution concentration.
- ethylenediamine-grafted silica gel,
- adsorption,
- Zn²⁺
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The Adsorption of Zn²⁺ Cations on Ethylenediamine-grafted Silica Gel