Exploration on the Preparation of Molecular Sieve from Fly Ash Source and Its Adsorption Properties of Ammonia Nitrogen
NaA zeolite molecular sieve was prepared from solid waste fly ash by alkali melting-hy-drothermal synthesis method,and then CaA zeolite molecular sieve was modified by simple ion exchange method.Combined with modern analytical methods such as X-ray diffraction(XRD),scanning electron mi-croscopy(SEM),transmission electron microscopy(TEM)and specific surface area testing(BET method),the morphology and structure of the two A-type molecular sieves were characterized,the isotherm adsorption process was analyzed,and the adsorption mechanism of the two molecular sieves was discussed from the per-spective of adsorption kinetics.The results show that the optimal adsorption conditions for ammonia nitrogen by the two molecular sieves are as follows:temperature of 25℃,pH of 6～7,molecular sieves dosage of 150 mg,and adsorption time of 40 min.In addition,the regeneration experimental data show that the regeneration efficiency of the two molecular sieves is above 95%,showing good cycling stability and having important po-tential industrial application value.
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