Adsorption of Methylene Blue From Aqueous Solution on Activated Carbon Produced From Soybean Oil Cake By Koh Activation

Abstract

This study presents the adsorption behavior of the methylene blue (MB) dye onto the activated carbon produced from soybean oil cake by chemical activation with KOH at 800 degrees C. The adsorption isotherms, kinetic models, and thermodynamic parameters of the adsorption were studied. The Langmuir isotherm showed a better fit than the Freundlich isotherm. The adsorption rate was described by pseudo-second-order kinetics. The negative values of Delta G degrees and the positive values of Delta H degrees indicate that the adsorption of MB was favored and endothermic.