地质聚合物原位转化沸石及其氨氮吸附特性

以高铝粉煤灰、钢渣为前驱体,采用化学发泡原理制备类沸石相多孔粉煤灰-钢渣地质聚合物,通过水热反应原理将上述地质聚合物原位转化为沸石.采用X射线衍射(XRD)仪、扫描电镜(SEM)定性分析碱液浓度、温度及时间对原位转化沸石结构形态的影响规律.以多孔地质聚合物原位转化沸石为吸附剂,结合吸附容量分析初始氨氮质量浓度、pH值及...

In-Situ Conversion of Geopolymer Zeolite and Its Ammonia Nitrogen Adsorption Characteristics

Using high-aluminum fly ash and steel slag as precursors,the porous fly ash-steel slag geopolymer with zeolite phase was prepared by chemical foaming principle,and the geopolymer was further converted into zeolite in-situ by the principle of hydrothermal reaction.Using XRD and SEM microscopic testing methods,the influence of lye concentration,temperature and time on the structure and form of in-situ conversion of zeolite was qualitatively analyzed.The initial concentration of ammonia nitrogen,pH value and the static adsorption behavior of solid-liquid ratio of ammonia nitrogen were analyzed by using porous geopolymer in situ convertor zeolite as adsorbent combined with adsorption capacity.The results show that under the hydrothermal synthesis conditions of lye concentration of 2.5 mol/L,hydrothermal temperature of 180℃,and time of 16 h,the zeolite-like phase in the geopolymer can be effectively converted to NaP and Na₆(AlSiO₄)₆·4H₂O zeolite phase in-situ;The type and content of zeolite,as well as the initial ammonia nitrogen concentration,pH value,and solid-to-liquid ratio have an important influence on the ammonia nitrogen adsorption effect of the prepared adsorbent.When the initial concentration of ammonia nitrogen is 100 mg/L,pH value is 7,and the mass ratio of solid to liquid is 1∶20,the adsorption effect of the porous material reaches the best.