A kinetic Thermodynamic study of carthmus tinctorious nigrocine dyes from aqueous solution by modified montmorilonite

The results of this work included the study of the adsorption of carthmus tinctorious nigrocine dyes from its water solutions on the modified montmorilonite surface using UV spectroscopy. The results showed that the isotherms of dyes are similar to the Giles classification type (S1,L3) also study of the temperature change within the experimental range (303-333K) in the process of adsorption of dyes on the surface of the clay, and carried out the study of adsorption of the dye (carthmus tinctorious) it decreased by increasing the temperature while the dye (nigrocine) increase by increasing the temperature, and study the effect of acidity on the capacity Adsorption and the thermodynamic functions were calculated to process of adsorption, containing Gypsum free energy and Entropy and Enthalpy