Preparation and characterization of dialdehyde 2, 3-diaminopyridine starch chelating polymer and its sorption potential for Cd(II), Cu(II) and Ni(II) ions in aqueous media

Dialdehyde cassava starch (DAS) was prepared and characterized. Polymeric chelating ligands containing 2,3-diaminopyridine have been prepared from dialdehyde starch, the removal of copper(II), nickel(II) and cadmium(ii) ions from aqueous solutions by dialdehyde 2,3- diaminopyridine starch (DAS2,3-DNH2PYR) was investigated. The adsorbent degree of substitution (DS) 0.82 was characterized by solubility test, Fourier Transform Infrared spectroscopy (FT-IR), elemental analysis, and Scanning Electron Microscopy (SEM). Batch adsorption has been performed to identify the binding property of metal (ii) ions. The maximum adsorption capacity was found to be 31.1mg/g for cadmium and nickel, 30mg/g for copper, and removal efficiency was 78%, 77.77% and 75% for cadmium, nickel and copper respectively. Polymeric chelating ligand could therefore be used to remove the metals from aqueous solution.