info:eu-repo/semantics/article
Preparación y caracterización de carbones activados a partir de un carbón mineral de la cuenca del Cesar (Colombia)
Preparation and characterization of activated carbons from coal of Cesar's basin (Colombia)
Registro en:
1900-2351
10.33571/rpolitec.v14n26a7
2256-5353
Autor
Fernández Hincapié, Jhon Jairo
Daza Barranco, Lina Mercedes
Orrego Miranda, Juan Fernando
Institución
Resumen
RESUMEN: En este trabajo se prepararon carbones activados a partir de un carbón bituminoso, mediante procesos de activación física y química. La activación física con vapor de agua (H2O) se realizó a temperaturas de 700 y 800°C y la activación química utilizando ZnCl2 0.2 N a 600, 700 y 800°C. Los carbones activados se caracterizaron mediante diferentes técnicas, como punto de carga cero (PZC), espectroscopia infrarroja (IR, DRIFT), área superficial y microscopia electrónica de barrido (SEM-EDX). Se obtuvieron carbones activados microporosos con áreas superficiales hasta de 351 m2/g con un volumen de poro de 0.15 cm3/g y un tamaño promedio de poro de 19.4 Å. El carbón activado de mayor área superficial fue apto para la remoción del azul de metileno cuya isoterma de adsorción se ajusta al modelo de Langmuir y la cinética de adsorción se ajusta al modelo pseudo-segundo orden y de difusión intraparticular. ABSTRACT: In this work, activated carbons were prepared from a bituminous coal, through physical and chemical activation processes. Physical activation with water vapor (H2O) was performed at temperatures of 700 and 800 ° C and chemical activation using 0.2 N ZnCl2 at 600, 700 and 800 ° C. Activated carbons were characterized by different techniques, such as zero load point (PZC), infrared spectroscopy (IR, DRIFT), surface area and scanning electron microscopy (SEM-EDX). Microporous activated carbons were obtained with surface areas up to 351 m2 / g with a pore volume of 0.15 cm 3 / g and a mean pore size of 19.4 Å. The activated carbon of greater surface area was suitable for the removal of the methylene blue whose adsorption isotherm fits to the Langmuir model and the kinetics of adsorption is adjusted to the pseudo-second order and intraparticular diffusion mode COL0015393
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