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 k J / mol and the Gibbs free energy is positive,which indicates that the adsorption of Zn( Ⅱ) is exothermic and non-spontaneous,respectively.
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