Abstract
The comparative study of the adsorption of three red dyes (phenolphthalein, Eosin B and carmine) on activated carbon and natural clay was carried out in a static régime. We used different physico-chemical techniques to know the crystalline structure of the DRX device, to do this a clear idea of the chemical bond by the FTIR analysis and finally to know the maximum absorbance λmax of the dyes it is by the method of analysis UV-Visible. The tree dyes removal percentage increases accordingly, reaching 99% for activated carbon and 98% for natural clay .The Langmuir and Freundlich adsorption models were used for descriptions of the adsorption equilibrium. The data was very well corrected with these models. Monolayer adsorption capacities were equal to 30 mgg-1 at which is in the range 5 - pH -8 in temperatures 25°C and time in rang 2 - hour - 30. Adsorption Measurements show that the adsorption process is very rapid and physical in nature. The results explain that the adsorption process is an exothermic and spontaneous physisorption and that the red color of three red dyes in three media (acid, neutral, base) does not influence the adsorption phenomenon
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