Methylene blue adsorption from aqueous solutions by biosorbent derived from Algerian date stones

Omar Khelifi, Ikram MEHREZ


In this study, Algerian date stones were evaluated for the preparation of a biosorbent, in order to use them for methylene blue (MB) removal from aqueous solutions. To describe the adsorption equilibrium, the experimental data were analyzed by some isotherm models. The Freundlich model showed better representation of data (R2>0.99). Kinetics study shows that pseudo-second order fitted the adsorption kinetics. Thermodynamic parameters showed that the adsorption process was feasible, spontaneous and exothermic. According to the results, the biosorbent derived from date stones is expected to be an economical product and beneficially low-cost biosorbent for MB removal from aqueous solutions.


Adsorption; Methylene blue; Biosorbent; Date stones.

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