BIOSILICA FROM RICE HUSK ASH AS A NEW ENGINEERING RAW MATERIAL IN NIGERIA (original) (raw)
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Production of Silica from Rice husk
International Journal of ChemTech Research, 2014
Rice husk (RH) is an agricultural waste, which is easily available in the market and Silica (SiO2) is the most abundant material in the earth's crust. This paper addresses the production of silica from the rice husk. The Rice husk ash (RHA) is obtained by burning of rice husk in a muffle furnace at a temperature of 500, 600 and 700 0 C, which is bio-organic Silica (SiO2) and has high pozzolanic activity. The temperature and the time duration for the combustion process are optimized. X-ray Fluorescence (XRF) analysis is carried out to determine the chemical composition of rice husk and that of the rice husk ash. The formed rice husk ash is treated with Sodium hydroxide (NaOH) and Hydrochloric acid (HCl) to produce silica. The obtained silica is used for the various applications like automotive industry, cosmetic industry, etc. The compound of silica like Sodium silicate (NaSiO3) is used for water treatment, concrete treatment, cement production, etc. The brief explanation for the...
International Nano Letters, 2012
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.
2021
The synthesis of silica particles from rice husk is a research based on natural materials and is classified as green material. Preparation of biosilica catalyst from calcined rice husk ash was carried out by the hydrothermal method using rice husk ash mixed with NaOH solution at a ratio of 1:5 (w/v) with the reaction temperature of 110-120C, the pressure of 0.15-0.2 MPa for 15-30 minutes. Biosilica results are then continued with the calcination process at a temperature of 200-500C for one hour. Biosilica with calcination is then compared to biosilica without calcination. These two kinds of biosilica are then characterized to determine their performance. The biosilica characteristic test that was carried out included X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET). The XRF test results show that biosilica with calcination process has higher silica and silica oxide content than that without calcination. The surface morphology of biosilic...
Applied Sciences
Utilization of biomass either as a renewable energy source or for the generation of biogenic materials has received considerable interest during the past years. In the case of rice husk (RH) and rice straw (RS) with high silica contents in the fuel ash, these approaches can be combined to produce high-grade biogenic silica with purities >98 wt % from combustion residues. The overall process can be considered nearly neutral in terms of CO2 emission and global warming, but it can also address disposal challenges of rice husk and rice straw. For the resulting biogenic silica, several advanced application opportunities exist, e.g., as adsorbents, catalysts, drug delivery systems, etc. This article provides a comprehensive literature review on rice husk and rice straw combustion as well as applied strategies for raw material pre-treatment and/or post-treatment of resulting ashes to obtain high quality biogenic silica. Purity of up to 97.2 wt % SiO2 can be reached by combustion of untr...
High-Grade Biosilica Isolated from Diluted Acids Leached Rice Husk
2017
Rice husk which consists of ~20% silica seems to be quite promising to be the biosilica resources. As one of the most abundant agricultural wastes derived from paddy milling sites, rice husks have been generally directly burn on sites causing air pollution and environmental problems. Rice husk silica is amorphous in nature which is quite reactive and has a great potential to be used as a raw material for various silica based products. The aim of this experiment was to study the efficacy of diluted acids such as HCl and citric acid in order to obtain high-grade silica. The characterisation of silica ashes included the analysis of composition and structure using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), X-ray Fluorescence (XRF). The specific surface area of silica was determined using Brunauer, Emmet, Teller-Surface Area Analyzer (BET-SAA). Silica produced from these experiments had an amorphous form. The highest silica purity with Si content of 96.2% wa...
Silica Gel, a value added product production from Rice Husk Ash
Journal of emerging technologies and innovative research, 2018
The present study deals with the production of Silica Gel from Rice Husk Ash. Different mills of Bundi district of Rajasthan were visited to know about the production and utilization of Rice Husk and Rice Husk Ash produced. Rice Husk Ash from different sources was chemically treated and the extracted amounts of Silica Gel were compared. It was found that Rice Husk Ash contains 70.90 percent to 84.50 percent Silica Gel. This suggests that Rice Husk, which is considered as waste product from the Rice Mills and sold at Rs. 300 per quintal, can be used for production of value added product such as Silica which has its commercial sale value of Rs. 200 per Kg. Introduction Rice is one of the staple foods of India. In Rajasthan, rice is mainly grown under the highly rain-fed areas like Kota and Bundi districts. It is estimated that 0.23 tons of rice husk is produced from every ton of rice produced. These mills use 70 percent of the Rice husk produced as a fuel in boiler. Burning rice husk ...
Rice husk ash as an alternate source for active silica production
Materials Letters, 2002
The objective of the present work is to develop a procedure for obtaining and characterization active silica with a high specific surface area from rice husk ash. The relative amount of silica was increased after burning out the carbonaceous material at different times and temperatures. A 95% silica powder could be produced after heat-treating at 700 jC for 6 h. The specific surface area of particles was increased after wet milling from 54 to 81 m 2 /g. D
Study of Characteristics of Rice Husk and Silica Obtained from Rice Husk
International Journal of Chemical Engineering and Applications
This paper presents the study of the features of the rice husk and to investigate the presence of silica in the rice husk. To obtain the pure silica, the rice husk was firstly washed and went through chemical treatment, prior to combustion. The combustion process was conducted at temperature of 700℃ for 2 hours. The rice husk ash obtained was studied and has been named as C3. The characteristics of C3 samples can be acquired by using scanning electron microscopy (SEM), x-ray diffractometer (XRD) and thermogravimetric analysis (TGA). The SEM images showed the material was in agglomeration. The silica content of C3 was observed to be 89.85% using EDS. The thermal properties of the C3 also was performed using TGA as the change with temperature up to 1000℃ with heating rate of 5℃/min. As from the result, the energy of organic compound lose at 700℃ was 0.0141mg/min and at 1000℃ was 0.00217 mg/min.
Characterisation of Girei Rice Husk Ash for Silica Potential
This study was carried out to determine the potential of Girei Rice Husk Ash (RHA) as reinforcement in metal matrix composite. Rice husk from local millers in Girei market in Adamawa state was collected, prepared and burned in metallurgical furnace at temperatures of 500 o C, 600 o C, 700 o C, 800 o C and 900 o C and the percentage ash yields determined. The resulting ashes were analysed using X-ray Fluorescence (XRF) machine to determine their chemical oxide composition. The result shows that the resulting ash yield based on mass basis were 19. 167%, 17.823%, 17.572%, 21.789% and 21.826% at 500 o C, 600 o C, 700 o C, 800 o C and 900 o C respectively. The ashes were found to contain high percentage of silica content of 96.841%, 96.256%, 97.096%, 96.691% and 96.409% then followed by alumina content of 0.944%, 1.023%, 1.135%, 1.074% and 0.965% at same temperatures respectively. These results shows that rice husk ash produce from Rice from Girei contain high percentage silica and some alumina and can be used in chemical formulations requiring silica such as in metal matrix composites. Key words: rice husk ash, silica, alumina and metal matrix composite
Green Synthesis and Characterization of Biosilica Produced from Sugarcane Waste Ash
Journal of Chemistry, 2017
In this study, ash from sugarcane waste was used in the synthesis of biosilica using alkaline extraction followed by acid precipitation. Different parameters that could influence the silica particle synthesis were evaluated. The ash and synthesized biosilica were characterized by a combination of spectroscopic and chemical techniques such as XRD, XRF, SEM, particle size analyser, N2 adsorption analysis, TGA, and FTIR. The best condition for biosilica production was achieved with fusion method and aging temperature of 80°C for 1 h during gel formation. X-ray powder diffraction pattern confirms the amorphous nature of synthesized silica. The purity of the prepared silica was 99% silica which was confirmed by means of XRF. The experimental data suggest that the sugarcane waste ash could be converted into a value-added product, minimizing the environmental impact of disposal problems.