STUDY OF ADSORPTION OF METHYLENE BLUE ONTO COFFEE GROUND

In this work, we study the elimination of an organic dye to use intensively in textile industry (Methylene blue BM) by adsorption on the coffee ground. The adsorbent was characterized beforehand. The physical characterization (porosity and surface) was determined by electronic scan microscopy MEB revealed the presence of a mesopore area. The chemical characterization was carried out by the pH at the point of zero load (pHPZC), confirmed the character neutral of material. Several parameters are studied in order to optimize the ideal conditions for a good adsorption of the pollutant study; in particular, the kinetics of adsorption, mass of adsorbent, the effect of the pH of the solution examined the effect the stirring velocity, the effect of salts and the temperature. The results were adapted to the kinetic models and the isotherms of adsorption.  The whole of the got results watch that the isotherms of adsorption of the systems adsorbing/adsorbed studied are described satisfactorily by the mathematical model of Freundlich. The pH of the solution as well as the presence of salts affects the output of discoloration. In addition, the thermodynamic study revealed that adsorption is spontaneous and endothermic.Therefore, one can conclude that this study showed that the coffee marc can be used like new natural adsorbent for the water treatment contaminated by the textile dyes.