Synthesis and characteristics of Na-A zeolite from natural kaolin in Korea
| Autor: | Chang-Han Lee, Woo-Ri Lim, Se-Yeong Hamm |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Morphology (linguistics) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Alkali metal 01 natural sciences Hydrothermal circulation 0104 chemical sciences Crystallinity Nanocrystal Chemical engineering Silica matrix hemic and lymphatic diseases General Materials Science Particle size 0210 nano-technology Zeolite |
| Zdroj: | Materials Chemistry and Physics. 261:124230 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2021.124230 |
| Popis: | Well-crystallized Na-A zeolite (Z-Kln) was synthesized from natural kaolin using a fusion/hydrothermal method. The crystal morphology and crystallinity of the Z-Kln were characterized with respect to the NaOH/kaolin ratio, SiO2/Al2O3 (Si/Al) molar ratio, and particle size. The relative crystallinity of the Z-Kln from 64.36 to 83.98% increases when NaOH/kaolin ratio increased from 0.6 to 0.9, however, no longer increases at the NaOH/kaolin ratio of 1.2. TEM images of the Z-Kln at the NaOH/kaolin ratio of 0.9 clearly showed the morphology of nanocrystals inside the hybrid silica matrix with the presence of Na, Al, O, and Si. The sizes of the Z-Kln crystals tended to decrease with increasing NaOH/kaolin ratios from 0.6 to 1.2. Tiny crystals of ~1.67 μm or less formed at a NaOH/kaolin ratio of 1.2. For obtaining high crystallinity, the fusion/hydrothermal method is proven to be effective to synthesize the Z-Kln at low alkali condition from the natural kaolin. Hence, this method will be a potential tool for producing cost-effective commercial products from natural materials using simple chemical processes. |
| Databáze: | OpenAIRE |
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