Cocoa Shell as Adsorbent for the Removal of Methylene Blue from Aqueous Solution: Kinetic and Equilibrium Study

Cocoa Shell as Adsorbent for the Removal of Methylene Blue from Aqueous Solution: Kinetic and Equilibrium Study


Subject and more

  • LCC Subject Category: Environmental Sciences
  • Publisher's keywords: Cocoa shell, adsorption, kinetics, equilibrium, activated carbon
  • Language of fulltext: english
  • Full-text formats available: PDF


    Theivarasu C., Mylsamy S. and Sivakumar N.



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Methylene blue (MB) adsorption from an aqueous solution onto activated carbon prepared from cocoa (Theobroma cacao) shell has been studied experimentally using batch adsorption method. Adsorption kinetics and equilibrium were investigated as a function of initial dye concentration and contact time, pH and adsorbent dosage. Pseudo-first order, pseudo-second order and intraparticle diffusion models were used to examine the experimental data of different initial concentrations. Kinetics studies indicated that the adsorption followed pseudo -second order reaction. The high correlation coefficient of intraparticle diffusion model proves the pore diffusion plays a significant role for the adsorption of MB onto CSAC. Equilibrium data was analyzed using Langmuir, Freundlich and Tempkin isotherm models. The maximum monolayer adsorption capacity of Cocoa shell activated carbon (CSAC) was found to be 37.03 mg/g by using Langmuir model equation. On the basis of experimental results and the model parameters, it can be inferred that the activated carbon prepared from cocoa shell was effective for the removal of methylene blue from aqueous solution.

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