Investigating the removal of fluoride from aqueous solution by using chitosan isolated from shrimp shells native Persian Gulf

Due to its high concentration on the surface and its pathogenic function, fluoride is noticeable. Fluoride at high concentrations can be dangerous. The World Health Organization's allowable concentration is 1.5milligrams per liter. The aim of this study was to take chitosan from shrimp shells and evaluate its performance in the removal of fluoride in aqueous solutions. The purpose of this study was to isolate chitosan from shrimp shells native Persian Gulf and evaluate its performance in the removal of fluoride in aqueous solutions.
Chitosan from shells native Persian Gulf shrimps in three stages, protein , minerals and de-acetylation separation. The isotherms and adsorption kinetics were evaluated in optimal conditions.
The results showed with 100 ml of 4 milligrams per liter of fluoride, the fluoride removal at pH = 7, 60 minutes contact time and adsorbent concentration of 2 grams per liter respectively. The result of the absorption curve obeys a second-order. Freundlich adsorption isotherm data were more consistent. Maximum capacities of 0.157 milligrams per gram was with the removal of fluoride with chitosan.
The extracted chitosan can be an effective adsorbent for the removal of fluoride from contaminated water so that the amount of fluoride in drinking water is reduced to below the allowable level of fluoride.