الملخص

In this research used the electrical conductivity, potential difference, acidity function and the probability Sticking on surface were used to detected the mechanism of Ions transportation of citric acids by adsorption from the solution to the surface of solid particles using anew adsorpent clay. The kinetics model (pseudo first and second order, Eleovich kinetic and Intraparticle diffusion) applied on the experimental results of adsorption as well as Freundlich and Tempkin isotherms, this study arrived to that the a high transportation of acid ions to the surface to form a surface complexation model with solid particles happened at low concentrations and temperatures, the result of adsorption obeyed the pseudo first order kinetic, and the Intraparticle diffusion occurred was a controlled process , the constants KF, KT for isotherms used to calculated the thermodynamic functions ΔG,ΔH,ΔS for adsorption process.