Nonlinear Analysis of the Kinetics and Equilibrium for Adsorptive Removal of Cd(II) by Starch Phosphate |
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| Authors: | Lei Guo Guiying Li Junshen Liu Yanfeng Meng Guoxiu Xing |
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| Institution: | 1. School of Chemistry and Materials Science, Ludong University , Yantai , P. R. China unikguo@gmail.com;3. School of Chemistry and Materials Science, Ludong University , Yantai , P. R. China |
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| Abstract: | In the present study, the nonlinear analysis method was used to evaluate the kinetics and equilibrium for Cd(II) adsorption on crosslinked starch phosphate (SP) from aqueous solution. The pseudo-first-order, pseudo-second-order and Elovich kinetic models were applied to test the kinetics experimental data, and the pseudo-first-order kinetic model provides a best correlation of the experimental data. Adsorption equilibrium data were fit by Langmuir, Freundlich, Dubinin-Radushkevich, and Sips isotherms. The results show that the data are best described by the Sips isotherms with a maximum adsorption capacity of 2.00 mmol/g. The effects of initial pH, and SP dose on the Cd(II) adsorption were also investigated. The adsorption capacities of Cd(II) on SP increase with the pH increasing from 2.0 to 8.0. |
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| Keywords: | Adsorptive removal Cd(II) equilibrium kinetics starch phosphate |
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