Études cinétiques et thermodynamiques de l'adsorption du bleu de méthylène (MB) en solution aqueuse sur un bioadsorbant à base de noyaux de Persea americana Mill

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

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

Études cinétiques et thermodynamiques de l'adsorption du bleu de méthylène (MB) en solution aqueuse sur un bioadsorbant à base de noyaux de Persea americana Mill

Auteurs

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 Auteur
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 Auteur
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 Auteur
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 Auteur
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 Auteur
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 Auteur
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 Auteur

DOI :

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

Mots-clés :

Persea americana, Bleu de méthylène, Adsorption, Biosorbant, Isotherm, Kinetic

Résumé

L'élimination du bleu de méthylène (BM) en solution aqueuse par adsorption sur un bioadsorbant à base des noyaux de Persea americana Mill (PAB) a fait l’objet de cette étude. L'adsorption a été étudiée en mode batch en variant le temps de contact (0 min à 390 min), la concentration initiale de la solution de BM (1 mg/L à 100 mg/L) et la température (301 K à 323 K). Les résultats obtenus ont montré que la capacité d'adsorption et le pourcentage d'adsorption à différentes températures augmentent avec le temps de contact. Cette augmentation est due à la disponibilité des sites libres d'adsorption à la surface du bioadsorbant. Les résultats de la cinétique et d'équilibre obtenus montrent que le modèle pseudo-second ordre (R² = 0,8422) est meilleur comparé au modèle pseudo-premier ordre (R² = 0,8149) pour décrire la cinétique d'adsorption du MB sur le biosorbant PAB. Le modèle d'équilibre de Langmuir (R² = 0,7771) décrit mieux l'équilibre d'adsorption du MB sur le bioadsorbant PAB par rapport au modèle de Freundlich (R² = 0,7752). Le paramètre de séparation de Langmuir RL et le paramètre 1/n de Freundlich, inférieur à 1, suggèrent que l'adsorption de MB sur le bioadsorbant PAB est favorable. Les valeurs de ΔG < 0, pour chaque température, montrent que l’adsorption de BM sur PAB est spontanée et favorable. Les valeurs positives de ΔH° < 40 kJ mol⁻¹ obtenues indiquent que l’adsorption est endothermique et essentiellement physique.

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