Abstract
Silica nanostructures are promising carriers for a variety of applications in biological and material sciences. Currently, there is a growing interest in the extraction of silica nanostructures from agriculture by-product and waste. Here we investigate the extraction of nanostructured silica from olive stone using an alkali leaching extraction method. The nature of chemical bonding of extracted powder was characterized using a Fourier transform infrared (FTIR) absorption spectroscopy. The morphology and elemental composition of the as-extracted powder were studied by scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS), respectively. The results show that the as-extracted powder consists of agglomeration of semi- spherical nano-sized particles of silica SiO2. Micrographs of transmission electron microscopy (TEM) reveal the formation of several hundred-nanometer sized particles, which are composed of agglomerated 15–68 nm porous silica nano-grains. X-ray diffraction (XRD) and FTIR results confirm that the as-extracted amorphous silica transforms into a crystalline (cristobalite) phase upon sintering it at 900 °C. The data presented in this study could allow the extraction of porous silica nanoparticles from olive stones for biological applications.
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Authors would like to thank Prof. I. Othman the director general of the AECS and the head of molecular biology and biotechnology department for their support.
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Naddaf, M., Kafa, H. & Ghanem, I. Extraction and Characterization of Nano-Silica from Olive Stones. Silicon 12, 185–192 (2020). https://doi.org/10.1007/s12633-019-00112-w
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DOI: https://doi.org/10.1007/s12633-019-00112-w