Abstract
Rice husk ash (RHA), an agro-waste material, was used for the synthesis of zeolite T powders following a simple and cost-effective process. In this process, silica as silicate was directly extracted from solid RHA particles in the presence of aluminate and other aqueous-based precursor materials. The synthesized powders were characterized by thermogravimetry analysis, differential thermal analysis, X-ray diffraction, Fourier transform infrared spectroscopy, N2 physisorption measurements, and field emission scanning electron microscopy (FESEM). Crystallization of zeolite T powders was noticed at 100 °C/24 h. The vibration bands of the powders at around 580 and 630 cm−1 indicated the characteristic double six ring of zeolite T. Micropore surface area and micropore volume of zeolite T increased significantly at 100 °C/72 h. FESEM images showed ellipse-shaped morphology of the powders, and their aspect ratio increased with increase in reaction time. A tentative mechanism was proposed for direct extraction of silica as silicate from RHA, and its conversion to zeolite T in the presence of other aqueous-based precursors by a single step process.
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Acknowledgements
The authors would like to thank the Director of this institute for his kind permission to publish this paper. They also acknowledge the help rendered by the Material Characterization division for material characterizations. One of the authors (S. Bohra) is thankful to the Manipal Institute of Technology, Karnataka for giving her permission to carry out her M. Tech Thesis work in CSIR-CGCRI. The study was funded by the Institute’s project of CSIR-CGCRI, under project No. OLP 299.
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Bohra, S., Dey, K.P., Kundu, D. et al. Synthesis of zeolite T powders by direct dissolution of rice husk ash: an agro-waste material. J Mater Sci 48, 7893–7901 (2013). https://doi.org/10.1007/s10853-013-7499-y
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DOI: https://doi.org/10.1007/s10853-013-7499-y