EQUILIBRIUM ISOTHERM, KINETIC AND THERMODYNAMIC STUDIES OF THE ADSORPTION OF CONGO RED DYE ONTO ACTIVATED CARBON FROM SNAIL SHELL.
- Federal University of Technology, Chemical engineering department, Owerri, Nigeria.
- Western Delta University, Physics with electronics department, Oghara, Nigeria.
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Snail shell samples were washed and carbonized at 400oC, ground, sieved and activated with 0.1M HCl at 800oC in a furnace. The activated carbon prepared, were used as adsorbent to remove Congo red from aqueous solution. Factors such as contact time, temperature and initial concentration were studied through single-factor experiment, while other factors are kept constant (at 30min, 30oC and 50mg/L) in each. Adsorption isotherm, kinetic and thermodynamic studies were carried out for the corresponding experiment. The isotherm results show that, Freundlich isotherm has the best fit for the adsorption. Again, the adsorption kinetic followed pseudo-second order reaction with rate constant (K2) = 0.2667 g/mg.min, correlation coefficient, (R2) = 0.9999 and adsorption capacity, (qe) = 2.2573 mg/g. Also, the thermodynamic parameters, enthalpy (?H) = 23.93KJ/mol, entropy (?S) = 84.64J/mol.K and negative values of free energy (?G) were obtained. These results show that activated carbon from snail shell is a good low-cost adsorbent for the removal of Congo red from aqueous solution.
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[Ikhazuangbe P. M. O and Eruoto M.O. (2017); EQUILIBRIUM ISOTHERM, KINETIC AND THERMODYNAMIC STUDIES OF THE ADSORPTION OF CONGO RED DYE ONTO ACTIVATED CARBON FROM SNAIL SHELL. Int. J. of Adv. Res. 5 (Feb). 349-355] (ISSN 2320-5407). www.journalijar.com
Federal University of Technology, Chemical engineering Department Owerri, Nigeria.
