| Equilibrium and kinetics of adsorption of Ca（ II ） ions onto KCTS and HKCTS |
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| 引用本文： | 丁萍,黄可龙,杨桦,李桂银,刘艳飞.Equilibrium and kinetics of adsorption of Ca（ II ） ions onto KCTS and HKCTS[J].中南工业大学学报(英文版),2010,17(2):277-284. |
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| 作者姓名： | 丁萍 黄可龙 杨桦 李桂银 刘艳飞 |
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| 作者单位： | |
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| 基金项目： | Project(20376085) supported by the National Natural Science Foundation of China |
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| 摘 要： | The adsorption of Ca(Ⅱ) ions from aqueous solution by chitosan α-ketoglutaric acid(KCTS) and hydroxamated chitosan α-ketoglutaric acid(HKCTS) was studied in a batch adsorption system.The Langmuir and Freundlich adsorption models were applied to describing the equilibrium isotherms,and isotherm constants were determined.The kinetics of the adsorption with respect to the initial Ca(Ⅱ) ions concentration,temperature and pH was investigated.The pseudo-first-order and second-order kinetic models were used to des...
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| 关 键 词： | 吸附动力学 平衡等温线 离子 Ca Langmuir 实验数据拟合 动力学模型 速率常数 |
Equilibrium and kinetics of adsorption of Ca(II) ions onto KCTS and HKCTS |
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| Ping Ding, Ke-long Huang, Hua Yang, Gui-yin Li and Yan-fei Liu.Equilibrium and kinetics of adsorption of Ca(II) ions onto KCTS and HKCTS[J].Journal of Central South University of Technology,2010,17(2):277-284. |
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| Authors: | Ping Ding Ke-long Huang Hua Yang Gui-yin Li and Yan-fei Liu |
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| Affiliation: | [1]School of Public Health, Central South University, Changsha 410078, China [2]School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China |
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| Abstract: | The adsorption of Ca( Ⅱ) ions from aqueous solution by chitosan a-ketoglutaric acid (KCTS) and hydroxamated chitosan a-ketoglutaric acid (HKCTS) was studied in a batch adsorption system. The Langmuir and Freundlich adsorption models were applied to describing the equilibrium isotherms, and isotherm constants were determined. The kinetics of the adsorption with respect to the initial Ca( Ⅱ) ions concentration, temperature and pH was investigated. The pseudo-first-order and second-order kinetic models were used to describe the kinetic data and the rate constants were evaluated. The results show that the experimental data fit well to the Langmuir isotherms with a high correlation coefficient (R~2). The pseudo-second-order rate expression provides the best fitting kinetic model. The pseudo second-order kinetic model is indicated with the activation energy of 26.22 kJ/mol and 6.16 kJ/mol for KCTS and HKCTS, respectively. It is suggested that the overall rate of adsorption of Ca( Ⅱ) ions is likely to be controlled by the chemical process. |
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| Keywords: | chitosan a-ketoglutaric acid hydroxamated chitosan a-ketoglutaric acid adsorption kinetics |
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