Evaluación de carbón activado de semillas de datura como material adsorbente de metales (cromo VI y plomo II)

Abstract

The present investigation work objective deals with evaluating the performance of the activated carbon obtained from datura seeds as a metal adsorbent (Chromium VI and Lead II); a carbonization of the datura seeds and activation with phosphoric acid was carried out; in the characterization of the carbon a proximal analysis and functional groups were carried out by Fourier Transform Infrared Spectroscopy (FTIR). For the equilibrium time determination, the solutions at the designated concentration were brought to constant stirring for each metal for approximately 390 minutes, taking aliquots of them during this time; these collected data were fitted to the kinetic models of pseudo first order and pseudo second order. A parameter varied at the time to obtain the PH and the absorbent dose to be reached as a major absorption capacity; adjusting to the Langmuir and Freundlich isotherms at three different temperatures, varying the concentration, keeping the other parameters constant; finally, a solution was made in which the chromium and lead ions were kept together to analyze the carbon affinity for one of these metals through the removal percentage for each one. It is concluded that the carbon obtained from datura seeds proved to be an adsorbent material with a great capacity to remove the studied ions, removing thus up to 7,426 mg / g of lead ions, and up to 1.8 mg / g of chromium ions evaluated under conditions of time, PH and suitable adsorbent dose; while the removal percentages for lead (II) were up to 79%, for the hexavalent chromium up to 53% was obtained. It is recommended that for a greater 𝐶𝑟6+ ion removal efficiency a different activating agent should be used for the charcoal.