In order to solve the problem of the separation of zeolites powder from disposal solution, the magnetic zeolites are synthe- sized by hydrothermal method. A series of zeolite samples with different iron content are reduced and characterized by X-ray diffraction, scanning electron microscopy, infrared spectroscopy, thermogravimetric and differential thermal analysis and magnetism testing. The results show that the crystalline structures of iron-incorporated zeolites are well integrated. When iron content in zeolites is low, the structure of iron-incorporated X zeolites is not changed, but it transforms to the same structure as 4A zeolites when the iron content is high. The iron-incorporated zeolites still maintain crystalline structure on hydrogen reduction below 700 °C, and their structures are destroyed completely when the reduction temperature rises up to 800 °C. The adsorptive experiments of fluoride ion and lead ion are carried out. The results show that the adsorption capac - 2+ ity of fluoride ions decreases slightly, but that of Pb reaches the maximum when iron content is 2.98%. The magnetization − 2+ process has little effect on the adsorption of F and Pb . Keywords X zeolites · Magnetism · Hydrothermal method · Adsorption Introduction framework by iron-incorporated hetero-atom zeolites. The catalysts produced by the last method
International Journal of Environmental Science and Technology – Springer Journals
Published: Jun 4, 2018
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