Removal of Congo Red Dye from Aqueous Solution Using Different Clays Adsorbent

Abstract

The current work aims to the adsorption of Dye (Congo Red (CR) ) from aqueous solutions through double adsorbing surfaces, namely Koura clay and pottery clay. Different methods are used to remove it from industrial wastewater. One of these successful methods is adsorption on solid surfaces within a wide range of dye concentrations under different experimental conditions such as (initial dye concentration, equilibrium time, adsorbing surface quantity, acidity function, and temperature). the best time for adsorption of dye (CR) on the surface of Koura clay is (1h), while its adsorption on the surface of pottery clay was (1.5 h), pH = 6, particle size =200 μm mesh, dye concentration 15 mg/L , and 0.05 g/L adsorbent) . The adsorption process balances were tested by some models such as (Langmuir, Frendelich, Elovich, Temkin, Harkin - Jura). The results showed that the adsorption of (Congo Red (CR)) dye on both surfaces of Koura clay and pottery clay followed the Frendelich model, and the adsorption isotherm was also applied to obtain thermodynamic functions within the experimental temperature range (290-320k). The values ​​of enthalpy ∆H, entropy ∆S, and gypsum energy ∆G depend on the calculation of the equilibrium constant (Keq).