Kinetics and Thermodynamics of Adsorption of Zn(Ⅱ) on Reduced Graphene Oxide

doi:10.3724/SP.J.1095.2014.40065

Chinese Journal of Applied Chemistry

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Kinetics and Thermodynamics of Adsorption of Zn(Ⅱ) on Reduced Graphene Oxide

HUANG Fu, ZHANG Fan^*, WANG Bo, SUN Huaju

(College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,China)

Received:2014-03-06 Revised:2014-05-22 Published:2014-11-08 Online:2014-11-08
Contact: Fan Zhang

Abstract

Abstract: Reduced graphene oxide(RGO) was prepared by reducing graphene oxide(GO) with ethylenediamine(EDA). The adsorption kinetics and thermodynamics of Zn(Ⅱ) onto RGO were investigated with a batch method. The Lagergren pseudo-first-order and pseudo-second-order kinetic model, Langmuir and Freundlich isotherm models were applied to simulate the experimental data. The results show that the experimental data are well described with the Lagergren pseudo-second-order model, indicating that the adsorption process is chemisorption mainly. The adsorption isothermal process fits well with the Langmuir model. The enthalpy change is -21.60 kJ/mol and the Gibbs free energy is positive, which indicates that the adsorption of Zn(Ⅱ) is exothermic and non-spontaneous, respectively.

Key words: Zn(II), graphene oxide, adsorption, kinetics, thermodynamics

CLC Number:

O647.3

HUANG Fu, ZHANG Fan*, WANG Bo, SUN Huaju. Kinetics and Thermodynamics of Adsorption of Zn(Ⅱ) on Reduced Graphene Oxide[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.40065.

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Kinetics and Thermodynamics of Adsorption of Zn(Ⅱ) on Reduced Graphene Oxide

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