Preparing Nanosilica Particles from Rice Husk Using Precipitation Method

Abstract

Nanosilica was extracted from rice husk, which was locally collected from the Iraqi mill at Al-Mishikhab district in Najaf Governorate, Iraq. The precipitation method was used to prepared Nanosilica powder from rice husk ash, after treating it thermally at 700°C, followed by dissolving the silica in the alkaline solution and getting a sodium silicate solution. Two samples of the final solution were collected to study the effect of filtration on the purity of the sample by X-ray fluorescence spectrometry (XRF). The result shows that the filtered samples have purity above 98%, while the non-filtered sample purity was around 96 %. The structure analysis investigated by the X-ray diffraction (XRD), found that the Nanosilica powder has an amorphous structure in nature. Also, it shows a broad peak at (2θ = 22.25°-22.55°). The particle size distribution was determined by Atomic force microscope (AFM), the results gave that the average diameter equals 52.83 nm and dimension range in 30-75 nm, while B.E.T. analysis confirms a high surface area around 618 m 2 /g. FT-IR Spectra experimental data showed the presence of hydrogen-bonded silanol group (Si-O-H) and siloxane group (Si-O-Si) which proved the high purity of Nanosilica particles.

Preparation and Characterization of High Surface Area Nanosilica from Iraqi Sand via Sol-Gel Technique

“…The spectrum shows a broad and more intensive band at 1087.85 cm -¹ , which is typical of the Si-O-Si asymmetric stretching vibration, in agreement with[12][23][25][26][27]. This band is less intense, but on the other side of the package, for the range 470.63 cm -¹ -802.39cm -¹ , which is due to symmetric stretching vibrations (Si-O-Si), these are the distinctive solid lines of silica, and these are in agreement with[13][20][21][25] . The high concentration of silanol groups (Si-OH) at 956.69 cm -¹ was seen in the results; this agrees with[23][25][26][27][28].Adsorbed water molecules on the SiO₂ surface cause -OH peak broadening, and there is a peak at 3437.15 cm -¹ .…”

“…When X-rays scatter in many directions, forming a big hill-like bump, with a peak in the range 2Θ = 15°-30°, indicating the presence of amorphous structure and a highly disordered form of silica, amorphous phase would predominate [20]. clearly showed the amorphous nanosilica components are uniformly dispersed.…”

Anti-Oxidant and Anti-Microbial Activities of [ZnO: CoO/ Eugenol] and [ZnO: Fe2O3/ Eugenol] Nanocomposites

“…They can have any composition and be organic, inorganic, or even both [3]. The potential of nanocomposites, a high-performance material that displays unexpected property combinations and unique design options, is so outstanding that it is helpful in a wide range of applications [4], such as medical treatments, civil, health, fabrication, information, techniques, environments, and energy sources [5]. Synthesis of metal oxide nanocomposite (MONCs): the synthesis of uniform-size nanocomposite is critical because its properties include optical, magnetic, electrical, and biological properties depending on their size and dimensions, more than one method can be used to synthesize the metal oxides (nanoparticles and nanocomposite) [6], and this study utilized a hydrothermal preparation approach since it needs low temperature, cheap costs, and a short time while being ecologically clean and nontoxic, with key parameters that can be readily modified and controlled [7].…”

Green Synthesis of Nanocomposite: Based on [Eugenol and Metal Oxides], Characterization and Biomedical Applications

“…Due to the presence of many functional groups, including allyl (-CH2-CH=CH2), methoxy (OCH3), and phenol (OH) 8 . Synthesis and characterization of nanocomposites received significant research interest because they have a much more surface area than their bulk counterparts, which gives them special features and possible applications 9 such as medical treatments, civil, health, fabrication, information, techniques, environments, and energy sources 10 . Nanocomposites are a combination or matrix, when several materials are combined to create novel material characteristics, one of the components must have a size in the range of 1-100 nm 11 .…”