Preparação de carvão ativado em baixas temperaturas de carbonização a partir de rejeitos de café: Utilização de FeCl3 como agente ativante

Abstract

Ferric chloride as a new activating agent was used to obtain activated carbons from agroindustrial waste. This material was prepared at three temperatures of pyrolysis, 200, 280 and 400°C. The carbonaceous materials obtained after the activation processes showed high specific surface areas (BET), with values higher than 900 m2 g-1. The materials showed different behaviors in the adsorption of methylene blue dye and reactive red textile dye in water solutions. An important fact in the use of FeCl 3 as an activating agent is that the activation temperature is at 280°C, well below of those commonly employed in chemical or physical activations described in the literature.