Adsorption of the crystal violet dye on an adsorbent material prepared from Moroccan oil shales

The aim of this work was the elaboration and characterization of materials prepared from the Moroccan oil shales of the Timandit region (layer X) and their use for the removal of the crystal violet dye from aqueous solutions. The adsorbent material, referred to as XHA, was characterized by several analytical and spectroscopic techniques. It was then used for the adsorption of the CVD in a batch system. This process was found to be highly dependent on the physicochemical parameters, such as the solution pH, the temperature, the contact time and the CVD initial concentration. The elimination of CVD by XHA reached 98.75%, and the process kinetic was of pseudo-second order. The results showed that the adsorption of the CVD dye is dominated by surface adsorption, resulting in the formation of a monomolecular CVD layer on the surface of XHA. The adsorption capacity was found to be 19.75 mg/g, according to the Langmuir model. The thermodynamic studies indicated that dye adsorption by XHA is spontaneous, endothermic and of a physisorption nature. [GRAPHICS] .