A Study on Kinetic Adsorption of Methyl Orange Dye by Activated Carbon Prepared from Banana Waste

บทคัดย่อ

The agricultural waste is one of the most important problems that must be resolved for the conservation of global environment. The banana waste consisted of peel and bunch were used in this study. The preparation of the activated carbon with the optimal conditions of the production by chemical activation with phosphoric acid (H3PO4) and carbonization temperatures at 800˚Cfrom both produces. This research studied the kinetic adsorption of methyl orange dye on activated carbon prepared from peel and bunch of banana (agricultural waste in Thailand) in a batch system. The peel and bunch of banana 0.05 g was a bio-adsorbent for methyl orange dye adsorption under the suitable conditions at 90 minutes adsorption time, pH 5.0 and 30˚C.The results showed that the adsorption capacity of methyl orange dye by both activated carbons reached the equilibrium around 90 minutes for all the ranges of concentrations studied. The uptake of methyl orange dye increased from 0.29 to 0.89 mg/g on increasing the initial concentration from 0.5 to 3.0 mg/L. The equilibrium of adsorption isotherm showed good correspond to Langmuir isotherm model with the maximum adsorption capacity found to be 0.86 mg/g for peel of banana and 0.89 mg/g for bunch of banana. These optimal conditions were applied to the study of potential adsorbent for the removal of methyl orange dye from the aqueous solution; it was found that the kinetic data was well described by the pseudo-second order kinetic model. The findings indicate that activated carbon prepared from peel and bunch of banana could be a low-cost alternative bio-adsorbent to be an activated carbon in the wastewater treatment for removal of dyes.