Avaliação da fibra do sisal como adsorvente de corante têxtil, presente em águas residuárias do processo de tingimento

Abstract

The present work sought to produce an alternative adsorbent from the Sisal fiber. The material was washed and dried in an oven at two different temperatures of 60°C and 80°C. The effect of Sisal's drying temperature was evaluated by factor planning 2³. The material was activated with hydrochloric acid (HCl) and sodium hydroxide (NaOH) with a concentration of 0,1 mol.L^-1 . The adsorbents were characterized by Fourier transform infrared spectroscopy (FT - IR) and Zero Load Point (PCZ). The effect of the variables adsorbent mass, dye concentration, pH, contact time and agitation were analyzed through Box-Behnken planning. The adsorption kinetics and isotherms were studied for each adsorbent system. The adsorption kinetics followed a Pseudo-second order and the maximum adsorption capacity for the material in natura, activated with HCl and NaOH were 14.76 mg.g^-1 , 18.30 mg.g^-1 and 3.58 mg.g^1 , respectively. The Freundlich model had the highest R² values and F test ratio, being this the model that best represented the adsorption equilibrium data. It is concluded that Sisal fiber is an attractive material to be used as a bioadsorbent in the adsorption of synthetic dye.