Adsorption of aniline blue onto grantia aucheri as a novel biosorbent from aqueous solutions: equilibrium, kinetics, and thermodynamics

In this study the adsorption of the anionic dye, aniline blue, onto a novel biosorbent with the local name of Tonbak Toureh and the scientific name of Grantia aucheri was considered. FT-IR and SEM were used for characterization of the biosorbent. The effect of dominant parameters including pH, amount of biosorbent, time, temperature, and initial dye concentration were investigated and the optimum conditions of pH of 4-5, time of 10 min, temperature of 25 ͦ C, dye concentration of 40 mg L-1, and biosorbent amount of 12 mg were achieved. The adsorption isotherms corroborate the experimental data were appropriately fitted to the Langmuir model with high adsorption capacity of 65.79 mg g -1. Artificial neutral network-genetic algorithm (ANN-GA) was applied for prediction and optimization of the process in which the closeness of the predicted values with experimental data confirms the efficiency and potential of ANN-GA for prediction and optimization of the adsorption process. The thermodynamic parameters were assessed. The positive ΔH° and ΔS° values described endothermic nature of adsorption. The adsorption of aniline blue followed the pseudo-second order kinetic model.