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

Abstract

In the present work, and ions adsorption onto the chitin has been studied in the static system using synthetic solutions of (Na₂HPO₄, 12H₂O) and NaH₂PO₄, with initial concentrations of 100 and 1,000 mg/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 0.75 g/g for and , respectively. The equilibrium is reached after 1 h for and 3 h for ions. The adsorption isotherms show a good correlation with the Langmuir and Freundlich model.

Keywords:

• Adsorption
• Orthophosphates
• Chitin
• Wastewater