APPLICATION OF STATISTICAL DESIGN APPROACH TO DEVELOP A LOW COST ACTIVATED CARBON FOR THE REMOVAL OF TEXTILE DYE DIRECT BLUE-86

摘要

An activated carbon was prepared by carbonization of Acacia Auriculiformis scrap wood followed by activation through microwave heating. The carbonization process was optimized through response surface methodology with three independent process variables such as carbonization temperature, carbonization time and nitrogen flow rate. The optimum values of these variables were found to be 750 ℃, of 3.5 h and of 300 ml/min respectively. The activated carbon was used for the removal of direct blue-86 dye from its aqueous solution. The adsorption kinetics was fitted well with pseudo second order rate model. The equilibrium data was well described by Langmuir isotherm and the corresponding monolayer adsorption capacity was found to be 476.19 mg/g. The changes in standard Gibbs free energy, enthalpy and entropy were determined as 8.58, 16.14 kJ/mol and24.61 kJ/mol. The value of activation energy was found to be 16.6 kJ/mol.