Adsorption of styrene sulfonate from aqueous solutions onto carbon fibers and mesoporous carbon

Véronique Wernert (1) , Renaud Denoyel (1)

1 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie

The removal of styrene sulfonate from aqueous solution by using different activated carbons, micropo-rous or mesoporous, is studied from kinetics and thermodynamics points of view. The results are interpreted in term of pore size distribution, pore organization and surface charge. Several classical models are tested both for kinetics and thermodynamics aspects. Very different behaviors are observed between the carbons but for all adsorbents, the kinetics were faster in presence of a saline solution and the amount adsorbed at saturation higher, showing the importance of surface charge that introduces an energy barrier against adsorption when molecules and surface have the same charge. Adsorption iso-therms were modeled with Langmuir and double Langmuir equations and the thermodynamic parameters were calculated and correlated with the adsorption behaviors. By using adsorption calorimetry to map the adsorption site distribution, it is possible to validate or not the models.

Keywords: Styrene sulfonate; Kinetics; Isotherms; Calorimetry; Carbon

Domains: Material chemistry

Véronique Wernert, Renaud Denoyel. Adsorption of styrene sulfonate from aqueous solutions onto carbon fibers and mesoporous carbon. Microporous and Mesoporous Materials, 2016, 222, pp.247-255. ⟨10.1016/j.micromeso.2015.10.029⟩. ⟨hal-01476928⟩