Study on Adsorption and Remove of Fluorine from Water by modified Zeolite

摘要

A modified Zeolite to be prepared and its performance of removing fluorine from containing fluoride water was reported. Firstly, using zeolite 4A as skeleton, by means of carrying to adsorb Fe~(3+) from containing ferri ions solution, which the zeolite can be modified and the coordination metal center are formed. Based on mechanism of ligand exchange, a new material of removing deeply fluorine from water was got. Secondly, the results show that this modified zeolite has favourable adsorbing capacity for fluorine from water, when fluorine concentration is about 4~25 mg.L~(-1), above 99.0% of fluorine can be removed from water. The static saturation adsorbing capacity is 20.1 mg.g~(-1), by following conditions:the pH of water range of 5-8; solid-to-liquid ratio of 1:50 and room temperature.Common-ions in water do not make affect to adsorbing fluorine by the zeolite and high selection in process of removing fluorine has been demonstrated.