Separation of Cadmium Using a new Adsorbent of Modified Chitosan with Pyridine Dicarboxyamide derivative and application in different samples
Mohannad M. Garoub, Mohamed A. Gado
Abstract
Abstract Pyridine di‐carboxyamide derivative coupled chitosan (CTPO) is a new adsorbent prepared by coupling N 2 ,N 6 ‐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.