STUDY OF THE ABILITY AND KINETICS OF ADSORPTION IN AQUEOUS SOLUTION OF CATIONIC DYES (MALACHITE GREEN, METHYLENE BLUE) ON IRAQI SILICEOUS ROCKS POWDERHUDA YASSIEN KHUDER, AMMAR JASIM MOHAMMED AND HAMEED KHALID ALIAbstract This study involves removing of cationic dyes, Malachite green dye (MG) and Methylene blue dye (MB)] by using Iraqi Siliceous Rocks Powder (SRP). Adsorption isotherms were studied and the factors which influence it, such as temperature, acidic effect and salt effect. Adsorption isotherms of (MG) were found to be comparable to Temkin equation. Adsorption isotherms of (MB) were found to be comparable to Freundlich equation. The adsorption process on this surface was studied at different temperatures and the results showed that the adsorption of (MG) on surface increased with increasing temperature (Endothermic process), while adsorption of (MB) on surface decreased with increasing temperature (Exothermic process). According to the above results the thermodynamic functions (ÎH, ÎG, ÎS) were calculated. The adsorption quantity increasing for (MG, MB) with increasing the acidity of the solution. The Kinetics of the adsorption of (MG,MB) on surface was studied. The results were treated to according Lagergreen equation. The Kinetic experimental data were properly correlated with First â order kinetic model.
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