Adsorption of Basic Yellow Dye From Aqueous Solutions by Activated Carbon Derived from Waste Apricot Stones (ASAC): Equilibrium, and Thermodynamic Aspects

The preparation of activated carbon from apricot stone (ASAC) with H2SO4 activation and its ability to remove a basic dye, basic yellow 28, from aqueous solutions were reported in this study. The adsorbent before and after adsorption was characterized by FTIR, and SEM, respectively. The effects of various experimental parameters, such as initial dye concentration, pH, adsorbent dosage and temperature were investigated in a batch-adsorption technique. The optimum conditions for removal of the basic dye were found to be pH 10. Fourth adsorption isotherms were used to model the equilibrium adsorption of basic yellow 28 on ASAC adsorbent (Langmuir, Freundlich, Redlich–Peterson and Langmuir-Freundlich). By considering the experimental results and adsorption models applied in this study, it can be concluded that equilibrium data were represented well by all isotherm equations under study. Thermodynamic parameters were also evaluated, which indicated that this process was spontaneous and endothermic.