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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