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Removal of Methylene Blue from Aqueous Solution using Banana Peel as Adsorbent

Rashid Mahmood, Naima Munawar, Muhammad Naeem Ahmed

Abstract


Adsorption is one of the major techniques employed for waste water treatment. This method is cost effective and is widely used for the removal of industrial effluents from waste water. In the present study this method has been used for the removal of dye (Methylene Blue) using banana peel as adsorbent. Adsorption studies were carried out using batch method by changing initial concentration, adsorbent dosage, pH and temperature and effect of these parameters were seen on the amount adsorbed(qe) mg.g-1 and removal efficiency. Initial concentration of the adsorbate was varied from (10-50) mgL-1 and amount of adsorbent from (0.5-1.5) g. All the experiments were performed by agitating the samples in thermostat water bath electric shaker at the optimized contact time i.e., 30 minutes. By increasing initial concentration from (10-50) mg.L-1, qe was found to increase. However, it was observed to be decreased by increasing adsorbent dosage from (0.5-1.5) g.   Gibbs free energy ΔG, enthalpy ΔH and entropy ΔS were calculated with the help of adsorption data. The data were found to be best fitted with Freundlich adsorption isotherm. Data were also employed on kinetic models such as pseudo first order, second order, intrapartical diffusion and Alovich’s model. Amongst all these, the correlation co-efficient R2 value was obtained to be maximum for Alovich’s model. The value of ΔG was found to decrease by increasing amount of adsorbent. On the basis of the given study it was investigated that banana peel played a better role in removing dye for its aqueous solution.   


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