Characterization and adsorption capacity of zeolite synthesized from fly ash
In order to provide a new resource utilization method for fly ash and obtain high value-added synthetic zeolite products,the fly ash produced by combustion of Shenmu and Indonesia mixed coal as fuel in a power plant was used to synthesize zeolite by alkali fusion-hydrothermal method.The fly ash and the synthesized zeolite were characterized and analyzed,and the adsorption capacity experiment was carried out.The results show that compared with fly ash,the micro-morphology of the synthesized zeolite is aggregated from granular to cluster,the mineral mullite disappears,and becomes the components of sodium aluminosilicate,aluminosilicate oxide and potassium aluminosilicate.Fourier trans-form infrared spectroscopy shows that new peaks appear and some peak shapes and positions change.The BET spe-cific surface area increases from 5 177 m2/kg to 13 233 m2/kg,the average pore size increases from 7.1 nm to 20.0 nm,and the pore size distribution is more uniform.The maximum unit adsorption capacity of heavy metal ions such as cop-per,lead,cadmium,nickel and chromium in wastewater increased from 34.27,92.58,32.53,10.08 and 14.31 mg/g to 110.26,144.39,49.56,52.19 and 45.14 mg/g,respectively.The synthesis of zeolite from fly ash is a promising way for comprehensive utilization of resources and preparation of mineral adsorbents.
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