Author(s) :

Emmanuel Oria Mateso, Anatole Kia Mayeko Kifuani, Bernick Wembolowa Tshene, Kifline Milebudi Kifuani, Léon Longo Khonde, Pitchou Bokolombe Ngoy, Gracien Bakambo Ekoko.

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Abstract :

This study investigated the removal of methylene blue (MB) from aqueous solution via adsorption onto a biosorbent derived from Persea americana Mill (PAB) kernels. Adsorption was studied in batch mode by varying contact time (0 to 390 min), initial concentration of MB (1 mg/L to 100 mg/L), and the temperature (301 K to 323 K). The results showed that the adsorption capacity and percentage of adsorption at different temperatures increase with contact time. This increase is due to the availability of free adsorption sites on the surface of the biosorbent. The kinetic and equilibrium results obtained in this study show that the pseudo-second-order model (R² = 0.8422) is a better fit than the pseudo-first-order model (R² = 0.8149) for describing the adsorption kinetics of MB on the PAB biosorbent. The Langmuir equilibrium model (R² = 0.7771) better describes the adsorption equilibrium of MB on the PAB biosorbent compared to the Freundlich model (R² = 0.7752). The Langmuir separation parameter RL and the Freundlich 1/n parameter less than 1 suggest that the adsorption of MB on the PAB biosorbent is favorable. The determined ΔG values for each temperature show that the adsorption of MB onto PAB is favorable and spontaneous. The positive ΔH° values indicate that the adsorption is endothermic and physical.

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