Methylene Blue Adsorption onto Activated Charcoal Prepared from Mangosteen Peel

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Panita Kongsune
Supaporn Rattanapan


The activated carbon from mangosteen peel was used as an adsorbent for removal of methylene blue
from the solution in a batch adsorption system. The isotherms, kinetics and thermodynamics of methylene blue adsorption were examined. The Langmiur isotherm was better in describing the adsorption process. The kinetics adsorption was fit well with pseudo-second order model. The mechanism of process was shown that the film diffusion was a rate-determining factor in the adsorption process. The thermodynamics study revealed that a change in enthalpy was -14.63 kJ/mol illustrated the exothermic adsorption process. The Gibbs free energy was negative value, suggesting spontaneous of adsorption process.


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