Removal of fluorine from drinking water with Na-P1 zeolite synthesized from coal fly ash

Na-P1 zeolite was synthesized by hydrothermal method from coal fly ash and used to remove fluorine from drinking water. The effects of adsorption time, zeolite usage and fluorinion concentration in water on the removal efficiency were investigated. The results suggested that the fluorine adsorption capacity of Na-P1 zeolite can be enhanced significantly through the modification with 1.0% NaOH solution for 12h and 2.0% KAl(SO4)2 solution for 36h in turn. The fluorine removal ability increases with the adsorption time and the amount of zeolites used. The mechanism of the adsorption was also discussed. The adsorption isotherm could be descried by the Langmuir isotherm equation.