Stilbite zeolite (STI), a natural zeolite with high crystallinity and an open pore system, was modified with FeCl3solution for the removal of fluoride from drinking water. The parent STI and modified STI (Fe(III)-STI) were characterized by FTIR, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Adsorption of fluoride on modified STI (Fe(III)-STI) was studied as a function of contact time, adsorbent dose, initial concentration, pH and coexisting ions. Fluoride concentration can be reduced down to the lower level of 1mgL-1under the optimum condition (with solid/solution ratio of 1:100 and the contact time of 2h and pH 6.94) when initial fluoride concentration of 10mgL-1is employed. The fluoride adsorption on Fe(III)-STI zeolite is well described by the Langmuir adsorption model, and the maximum fluoride adsorption capacity is 2.31mgg-1. The kinetic result indicates that the adsorption of fluoride on the modified natural zeolite follows pseudo-first-order model. The possible mechanism on fluoride adsorption on Fe(III)-STI zeolite is also discussed. © 2011 Elsevier B.V.
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