Behavior of Fluoride Ions in the Presence of Lanthanum and Magnesium Modified Corrosion Products

Abstract

An excess of fluoride ion in drinking water is an important issue worldwide. The present paper shows the effects of lanthanum or magnesium in corrosion products (CP) on the removal of fluoride ions from water using batch experiments. The effects of pH, contact time, fluoride concentration, and the dose of sorbent on the sorption of fluoride ions by the modified corrosion products were considered. Equilibrium was reached in 24 h of contact time and the sorption of fluoride was similar in the equilibrium pH range between 3.0 and 9.0. The pseudo-second-order model described the kinetic sorption process, and this behavior indicated that the sorption mechanism was chemisorption. The study revealed that the presence of lanthanum in the corrosion products significantly improved the F sorption capacity of this material.