Thermodynamic data of phenol adsorption on chemically modified activated carbons.

The presence of phenol in water bodies exists due to the discharge of wastewater from industrial, agricultural and domestic activities. Its presence in water is associated with a decrease in the quality of drinking water because its change the taste and odour [1]. The adsorption process is one of the most used treatments to remove the phenol of waters and the activated carbon is an appropriate adsorbent due to its high surface area, porosity and low cost. The studies about the adsorption process are addressed by different views of point such as equilibrium and thermodynamic data. In this work, the adsorption isotherms of phenol on five activated carbons with different physicochemical properties in aqueous solution are presented. In addition, the immersion enthalpies, the interaction enthalpies, the Gibbs energy and the entropy changes are included. The isotherms data are adjusted to the Freundlich and Sips models. The immersion enthalpy values are between -7.670 and -57.0 J g-1, the interaction enthalpies are between 48.00 and -11.70 J g-1, the Gibbs energy change are between -5337 and -12322 J mol-1 K-1 and finally, the entropy change values are between 18.10 and 39.70 J K-1.