Activation Des Noyaux De Jujube Pour L’obtention D’un Charbon Actif
Résumé: The present work studies the effect of carbonization temperature, impregnation ratio and activation temperature on the preparation of activated carbon from jujube stones using potassium hydroxide as an activating agent. Conditions to develop porosity of activated carbon to ameliorate adsorption of Orange G, Rhodamine B and Orange II dyes were investigated. The effect of various experimental parameters on adsorption such as time, adsorbent dose, pH and temperature was studied to evaluate adsorption capacities. Equilibrium data were analyzed using the well-known Langmuir and Freundlich models. Adsorption kinetics of three dyes followed by both the pseudo-first and pseudo-second order rate models. Thermodynamic parameters study showed that Orange G, Rhodamine B and Orange II sorption process on all adsorbents was spontaneous and endothermic. These results show that jujube stones could be valorized into a cost-effective activated carbon that can compete very favorably for the removal of dyes such as Orange G, Rhodamine B and Orange II from their aqueous solutions.
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