Adsorption properties of a novel 3D graphene/MgO composite for heavy metal ions

Abstract

A novel three-dimension (3D) graphene/MgO composite was synthesized through self-assembly and embedding MgO nanoparticle in reduced graphene in situ. Fourier transform infrared (FT-IR) spectroscopy, thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscope (TEM), powder X-raydiffraction (XRD) and X-rayphotoelectron spectroscopy(XPS) were employed to characterize the prepared 3D graphene/MgO composite. The adsorption performance of some metal ions on 3D graphene/MgO was investigated. The results showed that the adsorption capacity was greater than 3D graphene and the maximum adsorption capacity at 25 °C was found to be 358.96 mg/g, 388.4 mg/g and 169.8 mg/g for Pb²⁺, Cd²⁺ and Cu²⁺, respectively. The adsorption kinetic conformed to the pseudo-second-order kinetic model and the adsorption isotherm was well described by Langmuir model. The thermodynamic constants revealed that the sorption process was endothermic and spontaneous in nature. Based on the results of the removal of heavy metal ions from metal smelting wastewater, it can be concluded that the prepared 3D graphene/MgO composite is an effective and potential adsorbent.

Keywords

adsorption / heavy metal ion / 3D graphene / MgO

References

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