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hellen7256木虫 (小有名气)
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[求助]
求助翻译英文文献，请大侠帮助啊。
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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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