Adsorption Studies of Acid Blue-92 from Aqueous Solution by Activated Carbon Obtained from Agricultural Industrial Waste-Cocoa (Theobroma cacao) Shell

Abstract

The present study investigates the ability of cocoa (Theobroma cacao) shell activated carbon for the removal of acid blue-92 dye from waste water. Batch studies were performed to evaluate the influence of various experimental parameters like initial pH, contact time, initial concentration and adsorbent dose. Equilibrium isotherms were analyzed by Langmuir and Freundlich isotherm models. The adsorption data are best described by Langmuir isotherm model followed by Freundlich model. The pseudo-first order and pseudo-second order were used to describe the kinetic data. The experimental data fitted well to the pseudo-second order kinetic model. Results implied that cocoa shell activated carbon may be suitable as an adsorbent for the removal of acid blue-92 from aqueous solutions.