Abstract
NaP zeolite particles were prepared through a template-free hydrothermal condition at 100ºC. Parameters like Na2O/SiO2 and SiO2/Al2O3 molar ratios, gel aging time and aging temperature were investigated for regulating the crystallization of the final product. The samples at different synthesis stages were characterized with N2 adsorption at −196ºC, field emission scanning electron microscopy (FE-SEM), temperature programmed desorption of ammonia adsorption, X-ray diffraction, thermogravimetric and differential scanning calorimetry analysis and Fourier transform infrared spectroscopy. The experimental results evidenced that a high ordering crystallinity of NaP zeolite was obtained at Na2O/SiO2 and SiO2/Al2O3 molar ratios of 1.10 and 1.40, respectively, and a temperature of 100°C for 4 days of aging. FE-SEM image exhibited polycrystalline aggregates of NaP zeolite with crystallite sizes ranging up to 5.04 μm with cactus/cabbage like structures. The quantitative analysis of the total number of acid sites was found to increase as Na2O increases. The NaP zeolite sample with a Na2O/SiO2 molar ratio of 1.13 exhibited a large fraction of the acid sites on its external surface, contrary to that synthesized with a relevant ratio of 1.10. The optimized NaP zeolite could be successfully bestowed with excellent sorption properties of Ca(II) in aqueous solution. The kinetic parameters for Ca(II) adsorption were thoroughly investigated.
中文摘要
本文通过无模板水热法在100°C条件下制备了NaP沸石分子筛, 并研究了Na2O/SiO2和SiO2/Al2O3摩尔比、凝胶老化时间和老化温度等参数, 以调节最终产品的结晶度. 不同合成阶段的样品,用−196°C氮吸附、场发射扫描电子显微镜(FE-SEM)、氨程序升温脱附、X-射线衍射、热重和差示扫描量热分析以及傅里叶变换红外光谱法进行了表征. 实验结果表明, 在Na2O/SiO2和SiO2/Al2O3摩尔比分别为1.10和1.40, 100°C温度下老化4天, 可以获得高度有序结晶化的NaP分子筛. FE-SEM图像显示NaP分子筛的多晶聚集体晶粒尺寸可达5.04 μm, 具有仙人掌/卷心菜样结构. 定量分析发现酸位点总数随Na2O的增加而增加, Na2O/SiO2摩尔比为1.13的NaP沸石样品与1.10摩尔比合成的样品相比, 在外表面上具有大量的酸位点. 优化后的NaP分子筛在水溶液中具有优异的钙离子吸附性能, 本文对 钙离子吸附动力学参数进行了详细研究.
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Ibraheem O. Ali received his BSc and PhD degrees from Chemistry Department, Faculty of Science, Al-Azhar University in the field of inorganic chemistry. Recently, he has been promoted as a professor of material science and catalysis at the Faculty of Science, Al-Azhar University. His research interests include zeolite synthesis, materials design and surface modification.
Tarek M. Salama was born in Cairo, Egypt. He received his BSc and PhD degrees from Al-Azhar University (Cairo, Egypt) and Hokkaido University (Sapporo, Japan), respectively. He then obtained a postdoctoral position in prof. Hediki Hattori’s earth and environmental science lab in 1991. He joined the Catalysis Research Center (CRC), Hokkaido University, Japan (1993–1997) as a research professor where he worked with prof. Masaru Ichikawa on gold/NaY and gold/ZSM-5 systems for chemical, environmental and other industrial applications. As a professor of material science at Faculty of Science, Al-Azhar University, his research interests focus on controlled synthesis of zeolites, assembly of inorganic nanomaterials and tailored design of carbon-based materials like nano ferrites loaded into nano graphene oxide and graphene.
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Ali, I.O., El-Sheikh, S.M., Salama, T.M. et al. Controllable synthesis of NaP zeolite and its application in calcium adsorption. Sci. China Mater. 58, 621–633 (2015). https://doi.org/10.1007/s40843-015-0075-9
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DOI: https://doi.org/10.1007/s40843-015-0075-9