Abstract
A thermodynamic and kinetic study of the adsorption process of Zn (II) and Pb (II) ions from aqueous solution on the surface of graphene oxide (GO) to establish the mechanisms of adsorbate–adsorbent interaction on this surface. The effect of pH on the retention capacity was studied and adsorption isotherms were determined from aqueous solution of the ions; once the experimental data was obtained, the kinetic and thermodynamic study of the sorption process was carried out. The data were fitted to the Langmuir, Freundlich, Dubinin-Raduskevich and Temkin isotherm models. The results showed that Zn(II) and Pb(II) on the GO adsorbing surface fitted the Langmuir model with correlation coefficients (R2) of 0.996. Kinetic models studied showed that a pseudo-second-order model was followed and thermodynamically, the process was spontaneous according to the values of Gibbs free energy (ΔGo). N2 adsorption isotherms were determined and modeled with the NLDFT (nonlocal density functional theory) and QSDFT (quenched solid density functional theory) kernels.
Highlights
Nowadays environmental pollution is increasing due to the so-called “industrial development” and the proliferation of small and large industries that produce a large amount of pollutants
Different techniques were used to demonstrate the obtaining of graphene oxide (GO)
The high adsorption capacity of metal ions on GO was found to be due to their hydrophilic properties and the presence of functional groups containing oxygen atoms
Summary
Nowadays environmental pollution is increasing due to the so-called “industrial development” and the proliferation of small and large industries that produce a large amount of pollutants Within this type of industry can be mentioned mining, smelting, electroplating and battery manufacturing, all of which generate high pollution in lagoons, rivers, lakes and the oceans, due to the amount of deposits of heavy metal ions [1,2,3]. This generates serious health problems worldwide, due to the ingestion of these pollutants. Several of the methods, which have been designed, use porous-type materials due to the control that can be exerted during their synthesis since they can be functionalized to obtain special characteristics
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