Separation of Cadmium Using a new Adsorbent of Modified Chitosan with Pyridine Dicarboxyamide derivative and application in different samples

Abstract

Pyridine di-carboxyamide derivative coupled chitosan (CTPO) is a new adsorbent prepared by coupling N2,N6-dicarbamothioylpyridine-2,6-dicarboxamide with chitosan, which offers an excellent synergistic effect for the extraction of cadmium ions. FT-IR, X-ray diffraction, and thermal analysis techniques were used to characterize the modified new chitosan adsorbent. The Langmuir isotherm model accurately represents the adsorption effect with a maximum adsorption capacity of 307 mg/g. It was noted that the adsorption or up-taking process of cadmium ions corresponded more closely to the pseudo-second order instead of pseudo-first order kinetic. The thermodynamic tools ΔS, ΔH and ΔG were also evaluated indicating endothermic and spontaneous adsorption process with a randomness increasing. The prepared new adsorbent is successfully used to extract cadmium ions from the actual leach liquor of Wadi Um-Gheig ore sample.