In order to solve the problem of the separation of zeolites powder from disposal solution, the magnetic zeolites are synthesized 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 capacity of fluoride ions decreases slightly, but that of Pb2+ reaches the maximum when iron content is 2.98%. The magnetization process has little effect on the adsorption of F− and Pb2+.
International Journal of Environmental Science and Technology – Springer Journals
Published: Jun 4, 2018
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