Abstract
ACID red 73 dye is a colorant dyes is using in many dyeing processes and may causes many harmfull effects to aquatic life with lasting effects. So, it must be removed from aquatic environment, one of the most useful methods is the using of plants biomass in its removal. Therefore, both of raw andacid activated (with MCl) Calotropis procena fruits (CPF) was used for the adsorption of Acid red 73 (AR73) dye from an aqueous solution. Various parameters (including dye concentration,contact time, dose, temperature, and pH) were optimized to obtain the maximum adsorption capacity.Surface morphology and surface functional groups of both raw and modified CPF samples welt investigated by scanning electron microscope (SEM) and fourier transformation infrared (FTIR). Among the adsorbents, TIC1-CPF had more adsorption capacity (65%) than CPF (22.4%) at an initial concentration of 20 mg/L and at 30 degrees C.The thermodynamic parameters, such as the change in enthalpy (Delta H degrees), entropy (Delta S degrees), and Gibbs flex; energy (Delta G degrees), showed that the adsorption is exothermic, random and nonspontaneous at high temperatures.