Kinetic and thermodynamic studies adsorption of Methylene Blue (MB) in aqueous solution on a biosorbent based on Persea americana Mill Kernels

Authors

  • Emmanuel Oria Mateso Laboratory of Physical Organic Chemistry, Water and Environment, Department of Chemistry and Industry, Faculty of Sciences and Technology, University of Kinshasa, P.O. Box 190 Kinshasa XI, Democratic Republic of the Congo Author
  • Anatole Kia Mayeko Kifuani Laboratory of Physical Organic Chemistry, Water and Environment, Department of Chemistry and Industry, Faculty of Sciences and Technology, University of Kinshasa, P.O. Box 190 Kinshasa XI, Democratic Republic of the Congo Author
  • Bernick Wembolowa Tshene Laboratory of Physical Organic Chemistry, Water and Environment, Department of Chemistry and Industry, Faculty of Sciences and Technology, University of Kinshasa, P.O. Box 190 Kinshasa XI, Democratic Republic of the Congo Author
  • Kifline Milebudi Kifuani Laboratory of Physical Organic Chemistry, Water and Environment, Department of Chemistry and Industry, Faculty of Sciences and Technology, University of Kinshasa, P.O. Box 190 Kinshasa XI, Democratic Republic of the Congo Author
  • Léon Longo Khonde Laboratory of Physical Organic Chemistry, Water and Environment, Department of Chemistry and Industry, Faculty of Sciences and Technology, University of Kinshasa, P.O. Box 190 Kinshasa XI, Democratic Republic of the Congo Author
  • Pitchou Bokolombe Ngoy Laboratory of Physical Organic Chemistry, Water and Environment, Department of Chemistry and Industry, Faculty of Sciences and Technology, University of Kinshasa, P.O. Box 190 Kinshasa XI, Democratic Republic of the Congo Author
  • Gracien Bakambo Ekoko Laboratory of Physical Organic Chemistry, Water and Environment, Department of Chemistry and Industry, Faculty of Sciences and Technology, University of Kinshasa, P.O. Box 190 Kinshasa XI, Democratic Republic of the Congo Author

DOI:

https://doi.org/10.59228/rcst.026.v5.i2.286

Keywords:

Persea americana, Methylene Blue, Adsorption, Biosorbent, Kinetic

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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Published

2026-05-27

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Vol. 5 No. 2 (2026): Revue Congolaise des Sciences et Technologies

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