Metal-organic framework-801 for efficient removal of fluoride from water

Abstract

Fluoride excess in water is harmful to human beings. Adsorption is an effective way to remove fluoride in water. Exploring novel and efficient sorbents for fluoride adsorption is very necessary and challenging. In this work, the fluoride adsorption behavior of zirconium fumarate metal-organic framework-801 (MOF-801) in water is studied through batch adsorption experiments. MOF-801 has high and stable adsorption efficiency at pH 2–10. The fluoride adsorption capacity on MOF-801 is neither affected by high ion strength nor other anions including Cl−, NO3− and SO42−. The fluoride adsorption on MOF-801 follows a pseudo-second-order model and the Langmuir equation. The fluoride adsorption capacity of MOF-801 is 40 mg g−1 at 303 K, changing little with temperature. The effective defluoridation of MOF-801 resulted from the ion exchange of fluoride ions and hydroxyl group in MOF-801. The practical use of MOF-801 for fluoride adsorption from real water sample reveals the potential of MOF-801 as an efficient adsorbent for the removal of fluoride from water.