Etude potentielle de mélange des adsorbants naturels (grignons d’olive et noyaux de dattes) pour l’adsorption du chrome

H. Aksas, H. Cherifi-Naci, N. Babaci, K. Louhab

Abstract


Résumé: Cette étude a pour objectif d’étudier le potentiel d’utilisation de matériaux naturels (mélange homogène de noyaux de dattes et de grignons d’olives) issus de l’activité d’agriculture pour le traitement des eaux usées, chargées en polluant métallique: le chrome. Ces deux matériaux ont été activés chimiquement par l’acide phosphorique, en les mélangeant à différents pourcentages, afin d’obtenir une solution solide homogène et d’améliorer leur capacité adsorptive.

L’adsorption des ions du chrome est étudiée en milieu dispersé (batch) à la fois sur les matériaux pur  et à l’état du mélange à différentes proportions, composées d’une quantité fixe en noyaux de dattes (ND), et des quantités du grignon d’olive (GO) variées.

Les résultats d’adsorption du chrome montrent: qu’elle est maximale à un pH =5.6, croit avec la température et avec la concentration initiale du chrome dans la solution. Le modèle de Langmuir stimule mieux les isothermes d’adsorption du chrome que d’autres modèles étudiés (avec un coefficient de corrélation de 0.9988 pour (88% NDI, 12% GOI). L’adsorption du chrome augmente avec l’augmentation du taux du grignon d’olive dans le mélange d’adsorbant (grignon d’olive et noyau de date).

Abstract: This study aims to investigate the potential use of natural materials (homogeneous mixture of date pits and olive stone) from agricultural activity for the treatment of wastewater, loaded with metal pollutant: chromium.  These two materials were chemically activated with phosphoric acid, by mixing with various percentages to obtain a homogeneous solid solution and improving their adsorptive capacity. The adsorption of chromium ions is studied in a dispersed medium (batch) both on the pure materials and the state of the mixture in different proportions, composed of a fixed amount in date pits (ND), and the quantities of olive stone (GO) varied.

The chromium adsorption results show: it is maximum at pH = 5.6, increases with temperature and with the initial chromium concentration in the solution. The Langmuir model better stimulates the adsorption isotherms of chromium other models studied (with a correlation coefficient of 0.9988 for (NDI 88%, 12% GOI). The adsorption of chromium increases with increasing rate of olive olive in the adsorbent mixture (olive stone and date pits).


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