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It is well known that due to its simplicity of implementation, its low cost, the recyclability of the adsorbent and its high efficiency in the treatment of wastewater at low concentration, adsorption is found to be the most popular technique. However, this remains true on the sole condition of finding good adsorbents that are inexpensive. For our part, and in the interests of eco-design, we have developed an activated carbon at a lower cost from coffee grounds. The study is followed by the modeling of the adsorption isotherms.

The results of this study show that the efficiency of phenol adsorption increases with: the decrease in the initial concentration of phenol; increasing the mass of activated carbon; decrease in feed volume.

The isotherms were applied under the following conditions: mass of adsorbents (m=1g), feed volume V=0.5 and V=1L and phenol initial concentration of 15, 30, 45, 60, 75 and 90 mg/L. Based on the values of the correlation coefficient R2, it is easy to see that these adsorption isotherms are governed by the Freundlich model which assumes multilayer adsorption.