Synthèse et caractérisation de montmorillonite modifiée : application à l’adsorption des colorants cationiques

Abstract

In this work a series of supports were prepared by the organophilisation by the surfactant of alkyl ammonium and activation with the sulfuric acid H2 SO4 (1M) at 90°C. For better identifying these supports, we have characterized by DRX, IRTF and BET. The characterization shows that they have a wide structure porous and can advantageously be used for the depollution of used water, which us allows of applied in the elimination of the dyes cationic such as the brilliant green and methylene blue. Therefore, the aim objective in this study is, first, to improve the surface properties of bentonites following the various treatments then the application in the elimination of the dyes. The second objective of this study is studied of the effect of heavy metals such as lead on this elimination The study of adsorption consists in discussing the effects of contact time, the pH, the amount of adsorbents, the temperature and the initial concentration of the aqueous solution. It showed the process is always of second order, spontaneous and endothermic. The adsorption is well described by the model of Langmuir.