Study of the thermodynamic functions of adsorption of hexachromic ion on a new superimposed surface

Abstract

        In this study, a new type of composite attapulgite-melamine- urea (AMU) has been synthesized. AMU has been characterized by FTIR. The new composite was used to adsorption Cr⁺⁶ from aqueous solution by conditions of PH, temperature, weight of adsorbent  and contact time. It was found that the composite was effective in removing the Cr⁺⁶ at pH = 2, contact time (90 min) and temperature (25 ° C), weight of the adsorbent (2 gm). The results showed that the adsorption on the surface of AMU under go to Freundlich isotherm. Thermodynamic parameters (∆S°,∆H°,∆G°) have been calculated.