Efficient utilization of high-silica bauxite and minimization of bauxite residue are of great significance for the sustainable development of the alumina industry. In this paper, a novel process is proposed to extract Al2O3 and SiO2 from high-silica bauxite without residue discharge, that is, sintering bauxite with
The extraction process of bio-silica from bagasse ash is one outmost factor which affect yield of bio-silica produced. For instance, Sol-gel synthesis method is one of the conventional methods of ...
This study focuses on optimising amorphous silica extraction from soils by using NaOH. Based on the results of this test series, a method for quantifying amorphous silica in soils from temperate-humid climate is proposed. All tests were carried out on materials of known composition (well-defined samples of feldspar, clay minerals, bio …
The yield of silica produced from water-washed and acid-washed RHA was 71.71% and 72.44%, respectively for 2 h reaction time and without further calcination. Therefore, the optimum time of silica extraction from the RHA was 2 h at 105 °C by using a 3.0 M NaOH solution and constant stirring.
The importance of rare-earth elements (REEs) in the global economy is rapidly growing, since they are essential to many advanced technologies. Therefore, the development of more performant separation procedures for REEs has become necessary. In the present study, we used silica hybrid materials (SHMs), which were synthesized …
Silica has become a popular material due to its high abundance and many advantages in various fields. This material can be produced synthetically and extracted from nature with resultant advantages in the application of green production. Therefore, this article deals with the form of silica extracted from quartz sand, leaves, and agricultural wastes found in …
The amorphous silica was derived by first digesting rice straw with Soda AQ solution by varying NaOH concentration from 5 wt% - 25 wt% and 0.1 wt% anthraquinone (AQ) to dissolve silica content and ...
A series of silica-based materials were employed as sorbents within solid-phase microextraction vials. The aim of the study was to evaluate the effect of an additional phase on the distribution of the volatile and less volatile analytes. The adsorption of six probe molecules, namely isoamyl acetate, ethyl hexanoate (ethyl caproate), phenylethyl …
Aiming to overcome such an operational constraint, this study proposed the use of nanoparticles coated with silica and functionalized with a long carbon-chain silane (OTS) in the solvent extraction process. Due to the silica-layer coating of the magnetic core of magnetite and maghemite, such nanoparticles became stable when in contact …
Selective extraction of peptides from human plasma by highly ordered mesoporous silica particles for peptidome analysis Angew Chem Int Ed Engl . 2007;46(6):962-5. doi: 10.1002/anie.200603917.
The silica obtained from rice husks can be extracted in several methods. One of those methods is digestion by strong bases. In this study, nanosilica material derived from rice husk (RH-SiO2) was ...
2.4. In situ anion-exchange for SIL-Br SPE column. Three solutions of DS, DBS and NS with a concentration of 2 mmol/L individually flowed through one SIL-Br SPE column with 1.5 mL min −1 of flow rate for 40 min. As can be seen from Fig. 1, organic anions replaced Br-of IL sites in this step. Then, these columns were washed …
The synthesis of SGN18 is shown in Scheme 1, Scheme 2 through the post grafting method, and FT-IR spectrums of the synthesized materials are shown in Fig. 1.The main spectrum features of CTSG (a) displays a number of characteristic bands at 3470, 1099 and 801 cm −1.These bands are assigned to the stretching vibrations of H-bonded …
Rice is one of the major crops grown through the world. Once the paddy is separated from the rice grain, the kernel (hull) is removed from rest of the grain. This constitutes about, one third of the total mass of grains, commonly termed as „Rice Husk‟ or „Rice Hull‟. Rice husk is an agricultural residue abundantly available in rice producing countries. The annual …
Extraction of Silica from Sugarcane Bagasse, Cassava Periderm and Maize Stalk: Proximate Analysis and Physico-Chemical Properties of Wastes March 2019 Waste and Biomass Valorization 10(3)
Adsorption studies showed that 107 mg of methylene blue can be adsorbed by 1.0 g of silica produced from acid-washed RHA at pH 8 within 60 min. The …
In this study, we evaluate the effectiveness of a variety of silica resins for miniaturized DNA purification and gauge the potential usefulness for on-chip solid-phase extraction. A micro-solid-phase extraction (muSPE) device containing only nanograms of silica resin is shown to be effective for the adsorption and desorption of DNA in the ...
The aim of this acid leaching process was to optimize the extraction of silica from rice husk, as the remaining ash after combustion is rich in silica. The extracted silica was then used in the production of mesoporous silica MCM-41 and magnetic …
We examined the effect of particle size, small pore size (surface area), and surface modification of porous silica particles on the efficiency of DNA extraction. Our observations suggested that cfDNA could be captured by tertiary amine-modified particles and then removed from the particles by repeatedly washing with sodium bicarbonate (pH …
Rice husk is one of the agricultural by-products that is found abundantly around the world. After utilization of its organic matters as a source of energy in the combustion process, …
The extraction of silica is obtained by grinding the rice husk through powder. Then the samples were stirred with 1.0 M of citric acid and 1.0 M of …
Extraction of superior-quality plasmid DNA by a combination of modified alkaline lysis and silica matrix Anal Biochem . 1999 Jul 15;272(1):109-12. doi: 10.1006/abio.1999.4125.
Silica was extracted from nickel laterite ore by hydrothermal process with sodium hydroxide as reaction assistant. The effects of reaction temperature, reaction time, and NaOH-to-ore mole ratio on the extraction rate of silica were investigated by a single-factor experiment. The optimal reaction conditions for the preparation of silica were obtained as follows: …
Overall, this study presents a novel continuous silica extraction method for the efficient recovery of silica from rice husk-based biorefineries. Rice husk is the …
In this work, we have synthesized several new type of nitrogen donor ligands, 2,6-bis-(5,6-dialkyl-1,2,4 -triazine-3-yl)-pyridine with different alkyl groups and prepared the novel silica-based extraction-resins by impregnating these ligands into the SiO 2-P support with a diameter of 50 μm.
The silica extraction method is concerned with removing im-purities or unexpected substances from the natural materials. used. This substance can be extracted using several methods,
In this study, we prepared polycationic silica particles to extract DNA that has the negatively charged phosphate backbone from solution. The coated particles were prepared by mixing conventional silica gel particles and poly-Lys; these particles could efficiently extract 1.3 μg of cell-free DNA from 50 mL of (male) urine.
India is one of the major rice-producing countries. Rice husk is a major agricultural by-product from rice production, which is used as a fuel in boilers. Its use as fuel produces huge amounts of silica-rich rice husk ash (RHA). This paper aims at providing an overall assessment of environmental impacts associated with the extraction of silica …
The result shows that the maximum extraction efficiency of Silica (SiO2) is around 80% at NaOH concentration of 40%, ratio of fly ash to NaOH is 1:1, leaching temperature of 95 ℃, and leaching ...
In this study, the silica extraction from rice husk (RH) was optimized via the response surface methodology. The effects of temperature, potassium hydroxide to rice …
