Valorization of the Malian phosphate rock as an adsorbent requires the determination of its performances in terms of kinetics and maximum adsorption capacity. The potential of Tilemsi Phosphate Rocks (TPR), to remove methylene blue (MB) from aqueous solution was evaluated in a batch. Experiments were carried out as function of contact time, initial concentration (25–200 mg/L), pH (4–12) and temperature (20-60˚C). Adsorption isotherms were modeled with the Langmuir and Freundlich isotherms. The data fitted well with the Freundlich isotherm. The experimental data were analyzed by using two kinetic models: the pseudo first order, pseudo second order models. The results shows that equilibrium is quick, and the data were best described by the pseudo second-order model (R2= 0.99). The amount of the dye adsorbed increases with the mass of adsorbent. The adsorption process dependent pH with a high adsorption capacity at pH =4. The dye adsorption equilibrium was attained after 40 min of contact time. Removal of dye in acidic solutions was better than in basic solutions. The adsorption of (MB) increased with increasing initial dye concentration. The equilibrium data were revealed that Langmuir model was more suitable to describe the (MB) adsorption. Thermodynamic study showed that the adsorption was a spontaneous and endothermic. The results indicated that the Tilemsi phosphate rock could be an alternative for more costly adsorbents used for dye removal.The TRPcould be useful in implementation of a new cheap technology for textile wastewater treatment.
