Adsorção de cromo vi utilizando carvão ativado produzido do mesocarpo do coco verde

Abstract

Industrial waste containing heavy metals is always a major problem due to dangers to human health and also to the environment. An example of such metals is Chromium (Cr), widely found in various types of industries and which presents itself in the environment in the form of Chromium III and Chromium VI. When in concentrations higher than 0.05 mg.L-1 it becomes dangerous to public health because of its mutagenic and carcinogenic properties. An alternative for the removal of this contaminant is the adsorption using activated charcoal produced with the coconut fiber of the bay (coconut nucífera). This paper shows the results of the adsorption of chromium VI by activated carbon as adsorbent of dilute solutions. The studies regarding the production of activated carbon showed that the best coal produced BET surface area of ​​871.45 m² / g and that it was predominantly microporous. For adsorption of Chromium was used the best coal produced as adsorbent and the influence of the pH of the solution, since pH influences the surface properties of the coal activated and in the different ionic forms which the chromium solution can present. For a solution of 50 mg / L of Chromium was observed that for pH's more acids the removal reached up to 97.44%. To obtain the adsorption isotherm the tests were done with the pH at which the largest removal was obtained. The curve obtained shows that the adulation of chromium by activated carbon is favorable and the model that best fit the curve was the Langmuir model.