Abstract
Rice husk is considered a main agricultural waste in Iraq. High purity SiO2 NPs were produced from rice husk by enhanced precipitation and developed leaching processes for the preparation of silica from RH. In this study, pre-treatment for rice husk was with 3N HCl, and calcination at 700°C was achieved, then followed with a leaching process with (1.5, 2, 2.5, 3) N NaOH concentrations. The characterizations of the prepared SiO2 NPs were studied by X-ray fluorescence (XRF), X-ray diffraction (XRD), and atomic force microscopy (AFM). The results show that the prepared SiO2 NPs have an amorphous structure with a high purity of 99.75%. The results of the X-Ray confirm the amorphous nature of the extracted SiO2 NPs. Also, the AFM results indicated that the average diameter of the SiO2 NPs was 85 nm. It was noted that the leaching processes and pretreatment methods determine the structure, particle size, and quality of the synthesized SiO2 NPs.
Highlights
High purity nanosilica has unique properties that make it widely used in many applications as high capacity anodes, the conversion of solar energy, biomedical applications, and photovoltaic, 56 Publishing rights belongs to University of Technology’s Press, Baghdad, Iraq.electric, electronic devices [1,2,3]
The preparation process, properties, and applications of Rice Husk Ash (RHA) are studied by extensive researches during the last three decades, this subject was studied with many pieces of research [5]
To evaluate the effect of NaOH concentration on nano-silica powder, X-ray fluorescence (XRF) analysis is used for quantitatively investigating the level of impurities in nano-silica (SiO2) and evaluating the purification effect at (1.5, 2, 2.5, 3)N NaOH treatments
Summary
High purity nanosilica has unique properties that make it widely used in many applications as high capacity anodes, the conversion of solar energy, biomedical applications, and photovoltaic, 56 Publishing rights belongs to University of Technology’s Press, Baghdad, Iraq. Nittaya and thuadaij [11], prepared nano-silica by precipitation method and characterized by many analytical techniques They found that the obtained product was amorphous nano-silica and the specific surface area was 656 m2g-1. Carmona et al [12], extracted amorphous and white silica with both micro and nanometric particles from rice husk using mild acid solutions They conducted that the prepared nano-silica was prepared by a precipitation process which was extracted from Iraq agriculture sources. It was noted that the purity of nano-silica is dependent on many factors such as type of raw material, precipitation temperature, pretreatment steps, and the final purification process All these parameters determine the quality and quantitative of produced nano-silica. The main objective of the present investigation is to produce high purity nanosilica from agricultural wastes of rice husk by developed chemical extraction techniques
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