Obtención de carbón activado empleando residuos de cáñamo (cannabis sativa l.) mediante activación química aplicado a remover azul de metileno

Abstract

This study evaluates the conversion of hemp residues into activated carbon by chemical activation for the adsorption of the methylene blue dye. The physical characterization of the precursors was carried out by means of proximal analysis, resulting in 7.75% for humidity, 15.45% for fixed carbon, 1.59 % for ashes and 75.19% for volatiles. Two types of charcoal were obtained by pyrolysis of hemp residues (stems, branches and spikes). One type of carbon was synthesized by activation with 85% H3PO4 and the other without activation for the comparison of the studies, which were called CAC and CC for activated and not activated carbon, respectively, the synthesis was developed in an inert atmosphere of N2 gas at a flow of 50 mL/min, at 400 and 450 °C for the pyrolysis of biochar and activated carbon, respectively, the carbonization time was 1 hour. A chemical characterization was carried out by direct titration by neutralization, the same ones that demonstrated to have alkaline affinity given their negative values in the acid characters, this indicates that there is no presence of such surface groups in the surface chemistry of the adsorbents