Aplicabilidad del composito goethita - óxido de grafeno reducido para remover cianuro de aguas contaminadas.

Abstract

The present work studied the adsorption of cyanide ion (CN¯) on three different materials; graphene oxide (GO) and two composites of goethite/reduced graphene oxide (α-FeOOH/rGO) at different mass ratios; 100 mg GO / 69.50 g FeSO4 (1.43 mg GO/g FeSO4) for composite 1 and 100 mg GO / 17.38 g FeSO4 (5.75 mg GO/g FeSO4) for composite 2. The synthesis was carried out from pure graphite following the methodology described widely in the literature. The synthesized composites were characterized by scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), showing a clear difference in the distribution of the goethite nanosheets between composites 1 and 2, in the second one, the surface is more uniform and spaced due to its lower rGO/α-FeOOH ratio at the time of synthesis. The results show, for the adsorption of CN ̄ the best material turned out to be composite 2 with a capacity of 116.28 mg•g-1, then composite 1 and GO with a capacity of 97.08 mg•g-1 and 53.73 mg•g-1 respectively. Thanks to the ability of composites to acquire load depending on the medium they are in, allowing several times greater removal than conventional materials.