10.1186/2228-5326-2-29

Optimization of synthesis and characterization of nanosilica produced from rice husk (a common waste material)

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  • Ezzat Rafiee*1,
  • Shabnam Shahebrahimi1,
  • Mostafa Feyzi1,
  • Mahdi Shaterzadeh2,
  1. Faculty of Chemistry, Razi University, Kermanshah, 67149, IR
  2. School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, IR
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Published in Issue 2012-10-24

How to Cite

Rafiee, E., Shahebrahimi, S., Feyzi, M., & Shaterzadeh, M. (2012). Optimization of synthesis and characterization of nanosilica produced from rice husk (a common waste material). International Nano Letters, 2(1 (December 2012). https://doi.org/10.1186/2228-5326-2-29
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Abstract

Abstract Rice husk (RH), an inexpensive waste material, was used to produce nanosilica. Acid treatment of RH followed by thermal combustion under controlled conditions gave 22.50% ash of which 90.469% was silica. Various chemical treatments in varied conditions for controlled combustion were investigated in order to produce highly purified nanosilica. The structural properties (such as X-ray diffraction, Brunauer-Emmett-Teller, Fourier transform infrared spectroscopy, and transmission electron microscopy) of the silica were studied. The method was optimized, and the chemical composition of the product was determined by X-ray fluorescence and carbon, hydrogen, and nitrogen analysis. Lime reactivity of the ashes was determined. At optimized conditions, a nanosized, highly purified silica (98.8 mass percentage) was produced with a high surface area, high reactivity, and 99.9% amorphous in form. Strength and number of acidic sites were measured by potentiometric titration. This nanosilica showed strong and a large number of acidic sites in comparison with commercial silica, making it as a good support for catalysts. This economic technology, as applied to waste material, also provides many benefits to the local agro-industry.

Keywords

  • Nanomaterial,
  • Amorphous material,
  • Nanosilica,
  • Rice husk ash,
  • Silica powder,
  • Surface properties
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