Thermodynamic Adsorption Studies of Activated Carbon From Coconut Shell Using Methyl Orange Dye

Abstract

The present work evaluates the prepared coconut shell activated carbon (CSAC) using chemical activation as an adsorbent in removing Methyl orange (MO) dye from aqueous solution. Batch Adsorption experiments were conducted to determine the effectiveness of the CSAC as an adsorbent. The maximum adsorption capacity of 3.0 mgg -1 and the maximum %Removal of 99.8 were attained at optimum conditions of 6 gL -1 adsorbent dosage, contact time of 80 min, and at temperature of 330 K. the results obtained from enthalpy (∆H ⸰ = 46.4 KJ/mol) and Gibb's free energy of adsorption ∆G ⸰ = -3.62KJ/mol, -5.03 KJ/mol, -6.65 KJ/mol and -8.59 KJ/mol at 300 K, 310 K, 320 K and 330 K respectively, which concluded that, thermodynamic parameters show the adsorption process was exothermic, spontaneous and feasible in nature. The examination of the experimental data accord with Langmuir adsorption isotherm.