Removal of orthophosphate ions from aqueous solution using chitin as natural adsorbent

In the present work, [GRAPHICS] and [GRAPHICS] ions adsorption onto the chitin has been studied in the static system using synthetic solutions of (Na2HPO4, 12H(2)O) and NaH2PO4, with initial concentrations of 100 and 1,000mg/l. The adsorption process is affected by various parameters such as contact time, initial concentration, pH solution, and temperature. The results show that the chitin used avoids high capacity to retain orthophosphate ions up to 0.91 and 0.75g/g for [GRAPHICS] and [GRAPHICS] , respectively. The equilibrium is reached after 1h for [GRAPHICS] and 3h for [GRAPHICS] ions. The adsorption isotherms show a good correlation with the Langmuir and Freundlich model.