DOI: https://doi.org/10.55373/mjchem.v25i4.38

Keywords: Activated charcoal; Congo red dye; adsorption; isotherm; kinetic; thermodynamic study

Abstract

The investigation studied the removal of Congo red dye in aqueous solutions via adsorption by Azadirachta indica L. Bark Activated Carbon (AIBAC) under a variety of experimental strategies and optimization circumstances. By using the adsorption equilibrium method, various parameters have been examined. Freundlich, Langmuir, and Temkin adsorption isotherms were employed to analyse the adsorption isotherm. Thermodynamic parameters such as ∆Ho, ∆So and ∆Go were calculated, which indicated that the adsorption was spontaneous and endothermic. The kinetics of fictional second order was more appropriate than the pseudo-first order kinetic model. Through FTIR spectroscopy and SEM, AIBAC was examined both before and after the penetration of Congo red dye in water.