Characterization and evaluation of the adsorption capacity of dichromate ions by a clay soil of Impfondo

This work had as a general objective the evaluation of adsorption capacity of dichromate ions by clay collected in the Impfondo locality. The mineralogy of this soil was determined by X thermal analysis and thermogravimetry analysis. The geotechnical (Atterberg limits and grain chemical properties (chemical composition, CEC, Tamm Fe and Mehra properties (specific surface area and zero charge point) were evaluated. The adsorption isotherms and adsorption kinetics were carried out. Impf clay consists mainly of kaolinite, but also illite, quartz, goethite, anatase, rutile and hematite. Th particle size distribution corresponds to clay texture and offers the adsorption possibility. The surface properties (CEC, adsorption isotherm, adsorption kinetics, point of zero charge) have permitted to evaluate the adsorption capacity of Impf clay. This study showed that the adsorption isoth models. Both models are to the extent of acceptability. The Freundlich model was used to calculate the Freundlich constant and the heterogeneity factor. This study made it possible to conc kaolinite is low; it increases with the mass of the introduced kaolinite. And at a mass of 0.5 g of kaolinite in 25 ml of dichromate solution, the adsorption sites become saturated and the equilibriu the adsorption of dichromate is described by the second adsorption capacity of equilibrium dichromate ions. The adsorption of dichromate is fav is much lower than that of the zero charge point of the kaolinite.