Synthesis and characterization of zeolite LSX from rice husk silica (original) (raw)
2007, Suranaree Journal of …
Silica powder with approximately 98% purity was extracted from rice husk (RH), converted to a sodium silicate solution, and used as a silica source for the synthesis of low silica type X (LSX) by hydrothermal process. The synthesized zeolite in the form of Na and K cations, referred to as NaK-LSX, was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), which confirmed the success of the synthesis. Images from scanning electron microscopy (SEM) of NaK-LSX displayed multi-faceted spherulite particles composed of polycrystal particles with different sizes along with small amorphous particles. The particle size distribution of NaK-LSX from a laser diffraction particle size analyzer (DPSA) was in the range of 0.2-50 μ μ μ μ μm and nitrogen adsorption indicated a surface area around 400 m 2 /g. The structure of LSX did not change after the ion-exchange to produce an ammonium form but collapsed after subsequent calcination.
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