Definition and Importance: Dyes are widely used in the food, cosmetic, leather, paper, dye, rubber, plastic, textile and automotive industries. The discharge of colored wastewater causes serious environmental problems. Activated carbon is one of the widely used adsorbents for dye adsorption from aqueous solution because of its large surface area, large pore volume and high adsorption capacity. Aim: In this study, activated carbon was prepared from low cost and locally available Turkish green plum stones using LiOH with chemical activation at 500 °C. The Turkish green plum stones based activated carbon (AC) was characterized by N2 adsorption-desorption isotherms. Conclusion: The BET surface area, Langmuir surface area, micropore volume and total pore volume of AC were 272.28 m2/g, 426.60 m2/g, 0.017 cm3/g and 0.443 cm3/g, respectively. Adsorption of a food dye, allura red, by AC was examined in detail. The experimental adsorption equilibrium data were compared with the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (DR) isotherm models and the isotherm model parameters were determined. Pseudo first order and pseudo second order equations were fitted to the kinetic data, and the rate constants were evaluated. The kinetics followed a pseudo second order equation. The results revealed that the Turkish green plum stones based activated carbon have the potential to be used as a low cost adsorbent for the removal of allura red food dye from aqueous solutions.
Keywords: Turkish Green Plum Stones, Activated Carbon, Allura Red, Dye Adsorption, LiOH Activation