Etude de l'adsorption de surfactants ioniques et non ioniques sur de la matière végétale carbonisée

Abstract

The aim of this investigation was to assess the possible use of sulfuric lignins for the purification of industrial liquid wastes. The adsorption of anionic (SDS), cationic (CPC), and non-ionic (NPPO) surfactants on charred plant material was carried out under various pH and temperature conditions. Ionic and hydrophobic interactions are involved in the adsorption process. The analysis of the adsorption kinetics in aqueous and alcoholic media allowed the mode of adsorption to be characterized. The plot of the surfactant uptake against the square root of time led to the determination of the mode of diffusion. The effect of the chain length of alkylsulfates on their adsorption corroborated the involvement of hydrophobic interactions and could be correlated with the values of their cmc.