Adsorption study of Basic Blue 41 dye onto activated carbon from Persea americana nuts with phosphoric acid activation was achieved. The effect of operating parameters, the effect of pH (2-12), adsorbent amount (5-30 mg/50 mL), dye concentration (25-125 mg/L), contact time (0-200 min) and temperature (298-323 K), on the adsorption capacity was examined. The experimental isotherm data were analyzed using Langmuir and Freundlich models, which showed that the best fit was achieved by the Langmuir

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... odel with the maximum monolayer adsorption capacity at 625 mg/g. The adsorption kinetic process followed pseudo-second-order kinetics. Thermodynamic evaluation showed that the process was endothermic (DH 0 = 144.60 kJ/mol) and spontaneous (DG 0 varied from to -11.64 to -19.50 kJ/mol), while the positive value of entropy (DS 0 = 524.3 J/mol K) revealed increased randomness at the adsorbent-adsorbate interface. It was found to be a very efficient adsorbent and a promising alternative for dye removal from aqueous solutions.