The synthesis of magnetic X zeolites and their uptake of fluoride ion and lead ion
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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+.
KeywordsX zeolites Magnetism Hydrothermal method Adsorption
The authors wish to thank all who assisted in conducting this work.
The financial supports of the National Natural Science Foundation of China [Grant No. 204760211] and Education Foundation of Hebei Province [Grant No. 2006332] are gratefully acknowledged.
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