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首页> 外文期刊>Journal of Environmental Science and Health >Synthesis of zeolite NaA membrane from fused fly ash extract
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Synthesis of zeolite NaA membrane from fused fly ash extract

机译：用熔融粉煤灰提取物合成NaA分子筛膜

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Zeolite-NaA membranes were synthesized from an extract of fused South African fly ash on a porous titanium support by a secondary growth method. The influence of the synthesis molar regime on the formation of zeolite NaA membrane layer was investigated. Two synthesis mixtures were generated by adding either aluminium hydroxide or sodium aluminate to the fused fly ash extract. The feedstock material and the synthesized membranes were characterized by X-diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence spectroscopy (XRF). It was found by XRD and SEM that the cubic crystals of a typical zeolite NaA with a dense intergrown layer was formed on the porous Ti support. The study shows that the source of Al used had an effect on the membrane integrity as sodium aluminate provided the appropriate amount of Na+ to form a coherent membrane of zeolite NaA, whereas aluminium hydroxide did not. Morphological, the single hydrothermal stage seeded support formed an interlocked array of zeolite NaA particles with neighbouring crystals. Also, a robust, continuous and well-intergrown zeolite NaA membrane was formed with neighbouring crystals of zeolite fused to each other after the multiple stage synthesis. The synthesized membrane was permeable to He (6.0 x 10(6) L m(-2)h(-1) atm(-1)) and CO2 (5.6 x 10(6) L m(-2)h(-1) atm(-1)), which indicate that the layer of the membrane was firmly attached to the porous Ti support. Membrane selectivity was maintained showing membrane integrity with permselectivity of 1.1, showing that a waste feedstock, fly ash, could be utilized for preparing robust zeolite NaA membranes on Ti support.
机译：沸石-NaA膜是通过二次生长法从多孔钛载体上的熔融南非粉煤灰提取物中合成的。研究了合成摩尔体系对NaA分子筛膜层形成的影响。通过将氢氧化铝或铝酸钠添加到熔融的粉煤灰提取物中来生成两种合成混合物。通过X射线衍射（XRD），扫描电子显微镜（SEM）和X射线荧光光谱（XRF）对原料和合成膜进行表征。通过XRD和SEM发现，在多孔Ti载体上形成了具有致密的共生层的典型沸石NaA的立方晶体。研究表明，所用的Al来源对膜的完整性有影响，因为铝酸钠可提供适量的Na +以形成NaA分子筛的粘结膜，而氢氧化铝则没有。从形态上讲，单个水热阶段的种子载体形成了与相邻晶体互锁的沸石NaA颗粒阵列。同样，在多步合成后，形成了坚固的，连续的和相互渗透的沸石NaA膜，其中相邻的沸石晶体彼此融合。合成膜可渗透He（6.0 x 10（6）L m（-2）h（-1）atm（-1））和CO2（5.6 x 10（6）L m（-2）h（-1） ）atm（-1）），表明膜层牢固地附着在多孔Ti载体上。维持了膜选择性，显示了膜的完整性，其选择性为1.1，表明可以使用废物原料粉煤灰在Ti载体上制备坚固的沸石NaA膜。

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