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Based on this work, the composition ratios of the geopolymers can be designed according to the NaA zeolite composition, and the expected zeolites can then be obtained through the use of appropriate hydrothermal treatment conditions [15-16]. In this study, we first prepared inorganic membranes of the Al2O3-2SiO2-Na2O geopolymers using a pre-forming process and then transformed this material into self-supporting NaA zeolite membranes using a hydrothermal procedure. These membranes were found to be different from traditional zeolite membranes, which are primarily supported by crystalline materials (NaA zeolite). Through the hydrothermal process, geopolymers can be transformed into zeolite crystals, as was demonstrated by the results from the XRD and SEM analyses. The transformation ratio of the NaA zeolite is approximately 81%, as determined through the concentration of residual Na ions in the water after the hydrothermal process [16]. The characterization of the membrane is essential for the evaluation of the quality of the synthesized membrane. In this study, the measured compressive strength of the Al2O3-2SiO2-Na2O geopolymer was 49.1 MPa. After the hydrothermal treatment procedure, the compressive strength of the specimen achieved values as high as 57.6 MPa, which can satisfy the requirements for traditional inorganic membranes. The microstructure of the self-supporting zeolite membranes was characterized through scanning electron microscopy (SEM) and N2 adsorption experiments (Table 1). Fig. 3 presents the SEM images of the geopolymer and the hydrothermal sample and reveals that the NaA zeolite crystals synthesized from the geopolymers were randomly grown to a size of 1 µm. Fig. 3a presents SEM images of the top surface of the as-prepared Al2O3-2SiO2-Na2O geopolymer, and Fig. 3b shows SEM images of the top surfaces of the self-supporting membranes after the hydrothermal process. The crystalline NaA zeolites in Fig. 3b are dense and exhibit good crystallinity. By comparing the top surface and the cross section of the hydrothermal sample (see Fig. 3d), the density and crystallinity of the top-surface region are obviously greater than those in the inner region. The loose inner structure of the self-supporting membranes is beneficial for increased flux, and the dense surface is beneficial for an improved separation effect [1, 11, 16]. |
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baoshanqiu
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hellen7256: 金币+35, 翻译EPI+1, ★★★★★最佳答案 2015-06-17 21:43:23
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以此研究为基础，地质聚合物的组成比率可根据NaA沸石组成来设计，因此采用适当的水温处理条件[15-16]就可得到预期的沸石。本研究中，我们首先预形成过程制备了 Al2O3-2SiO2-Na2O地质聚合物的无机膜，再用水温处理将这种材料转化为自身支持的NaA 沸石膜。这些膜不同于传统的沸石膜，它们主要由晶体材料（NaA 沸石）支持。经水温处理，地质聚合物可以转化为沸石晶体，如X射线衍射和扫描电镜分析结果所示。由水温处理后测定水中残留的Na离子浓度[16]得知，NaA 沸石的转化率大约为81%。 膜的特性对于评价合成膜的质量至关重要。本研究中，测得Al2O3-2SiO2-Na2O地质聚合物的耐压强度是 49.1 MPa。水温处理后，样品的耐压强度达到57.6 MPa，可以达到传统的无机膜要求。用扫描电镜（SEM）和N2吸附实验研究了自身支持沸石膜的微结构（表1）。图3为地质聚合物和水温样品的SEM影像， 表明由地质聚合物合成的NaA 沸石晶体随机的增长到1微米大小，图3a 代表制备的 Al2O3-2SiO2-Na2O地质聚合物上表面SEM影像， 图3b 为水温处理后自身支持膜上表面的SEM影像。图3b中晶体NaA 沸石是致密的，显示良好的晶体性。比较水温样品的上表面和横切面（见图3d),可见上表面区域的致密性和晶体性明显要高于内部区域。自身支持膜疏松的 内部结构有益于增加流量，而表面致密有益于提高分离效率[1,11,16]. |
2楼2015-06-17 05:36:57
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