Adsorción de fosfatos a partir de material adsorbente elaborado con residuos de café

Abstract

Abstract: This research project was developed with the purpose of obtaining an adsorbent material from coffee residues (Coffea arabica) applied in the recovery of phosphates present in aqueous solutions. Activated carbon was developed by the biochar method, executing a chemical modification in its structure with Fe, Zn and Mn. In adsorption kinetics analyses, the material reaches equilibrium within 90 minutes, presenting a maximum adsorption capacity of 43,00 mg PO4 3- ∙g -1 at standard conditions. In the desorption process, 57.57% of phosphates adhered to the solid structure were recovered, using a solution of sodium bicarbonate. On the other hand, the kinetic models that best adapt the results of the research are pseudo second order and intraparticle diffusion. Finally, the data acquired were adjusted to Langmuir's isotherm model, showing better accuracy in their coefficient of determination.