Adsorption of Crystal Violet Dye by Biochar produced from Sugarcane Bagasse under Different Temperatures

Abstract

Biochar has been successfully used to treat wastewater. The adsorption capacity of biochar and their properties depended on the temperature used at their production as well as on each type of feedstock. In this study biochar was produced from sugarcane bagasse at 500 o C and 650 o C, to investigate the adsorption behavior of crystal violet dye (CV). The batch technique was used to investigate the effects of physiochemical parameters (contact time and initial dye concentration). The data was submitted to first and second pseudoorder kinetic models. These equations were used to characterize the dye kinetics adsorption process. The study's findings demonstrated that the pseudo-second-order equation was the best fit for the kinetic studies (R 2 = 1 and R 2 = 0.9998) for both biochar 500 o C and biochar 650 o C, respectively. Furthermore, the quantity equilibrium (q values) calculated (qecal) from the pseudo-second-order were highly consistent with experimental q values (qeexp) compared to those calculated from the pseudo-first-order. Freundlich and Langmuir's adsorption isotherm models were used to calculate the adsorption constants. Freundlich adsorption isotherm correlation coefficient (R 2 ) values for biochar at 500 °C and biochar at 650 o C were 0.9944 and 0.9751, respectively. This finding indicates that crystal violet adsorption data can be best suited by the Freundlich adsorption isotherm.