Adsorption and kinetic study of cocoa pod husk activated carbon on dyes

Abstract

Dye effluent is a contaminant that can poses serious effect to health and environment. There are various approaches in order to treat this problem. Adsorption is one of the treatments which leave no harm to the environment. Cocoa pod husk had been suggested to remove synthetic dye from aqueous solution. Several parameter studies and analysis were done in term of isotherm and kinetic. In this project, 99% of MB dye was able to be removed within the time of 30 minutes by dosage of 0.4g. It also shows best removal percentage at high pH value. For MO, 99% of dye was able to be removed within the time of 100 minutes by the dosage of 0.7g. MO shows best removal percentage at low pH value. In overall, MB shows better results than MO in term of adsorption capacity, and adsorption equilibrium constant. Langmuir isotherm had a better fitting model than Freundlich isotherm by considering all of parameters. Furthermore, kinetic study proved that the data of adsorption process belongs to Pseudo-second order with the constant rate of 0.2041 g/mg.min for MB and 0.2083 g/mg.min for MO respectively.