Removal of Methylene Blue Dye in Water Using Longkong Fruit Peels

Abstract

The adsorption of methylene blue dye from water onto longkong waste peel has been investigated under various experiment conditions. Batch experiments were conducted to determine the effect of pH, initial dye concentration, contact time, adsorbent dose and temperature. The equilibrium time was found to be 205 min at the optimum pH of 7. The capacity of adsorption was improved with increasing of initial dye concentration and temperature. In contrast, as the mass of adsorbent increased, a decrease in the adsorption capacity was obtained. For isotherm study, the adsorption data of longkong peel was best fitted to Freundlich model. The kinetics of adsorption followed the pseudo second order model. Thermodynamic parameters such as, enthalpy, entropy and free energy changes were evaluated. The adsorption process was exothermic and spontaneous.