His research interests are resource utilization, and metallurgical physical chemistry. SU Bowen,SHI Gongchu,LIAO Yalong, et al. Research Progress on Functional Materials Preparation of Silica from Industrial Solid Wastes [J]. Materials Reports, 2021, 35 (3): 3026-3032. SUN Hongjuan, ZENG Li, PENG Tongjiang.
@article{Li2016PreparationAP, title={Preparation and photocatalytic performance of magnetic Fe3O4@TiO2 core–shell microspheres supported by silica aerogels from industrial fly ash}, author={Zhen-duo Li and Huilong Wang and Xiao-Na Wei and Xiaoyu Liu and Yun Feng Yang and Wen-Feng Jiang}, journal={Journal of Alloys and …
Owing to their ultra-low thermal conductivity, silica aerogels are promising thermal insulators; however, their extensive application is limited by their high production cost. Thus, scientists have started to explore low-cost and easy preparation processes of silica aerogels. In this work, a low-cost method was proposed to prepare silica aerogels …
Nowadays, for most applications, the industry requires uniformly ordered colloidal silica particles obtained with high quality and at relatively low cost. Thus, the synthesis of silica particles by the sol–gel method is very suitable for these purposes. ... 2.1 Preparation of monodispersed silica particles. Tetraethyl-orthosilicate (Si[OC 2 H ...
Aerogels offer outstanding characteristics such as lightweight, high porosity, large specific surface area, and low density. For silica aerogels, because of the particular network containing –Si–O–Si–, it has low thermal conductivity, excellent sound insulation and small index of refraction, as well as numerous applications in areas of aerospace, biomedical, …
Colloidal silica is used in many applications including catalysis, pharmaceuticals, and coatings. Although naturally formed silica materials are widely available, they are often in forms that are difficult to process or are even harmful to health. Therefore, uniform colloidal silicas are generally manufactured using synthetic chemical …
Sol preparation is the first stage of aerogel synthesis. In this stage, solution of various reactants undergoes hydrolysis and condensation reactions [].The reaction of a metal alkoxide (M–OR) with water forms a metal hydroxide (M–OH) as following: M–OR + H 2 O = M–OH + H–OR. In contrast, a condensation reaction occurs when two metal …
A facile approach to synthesis of silica nanoparticles from silica sand and their application as superhydrophobic material. A. Ismail. …
Generally the silylation of hydroxyl groups on silica fillers using organosilane coupling agents such as organoalkoxysilanes and organochlorosilanes is the most commonly used method for composition with organic polymers [7], [31], [32].This is the modification of inorganic oxide particles by chemical reaction since it can lead to much …
This study presents a robust and scalable method for synthesizing continuously the silica microspheres via the Stöber method. Owing to the superb mixing accessible with gas-liquid segmented flow in coiled microtube, satisfactory morphology and mono-dispersity of silica spheres was obtained. The continuous method was firstly …
The formation process of stable colloidal silica solution was discussed in this article. The affecting parameter including pH, zeta potential, and colloidal concentration was investigated to elucidate the stability of colloid. Sodium silicate was used as the silica source. The colloidal silica prepared via sol-gel method at the base condition.
This study aims to recycle industrial silica-alumina gel waste for the low-temperature massive preparation of high-quality mullite whiskers. In this work, Na 2 SO 4 and AlF 3 ·3H 2 O were used as the molten salt and crystallization catalyst, respectively, and industrial silica-alumina gel waste and Al 2 (SO 4 ) 3 ·18H 2 O were used as the ...
Preparation of silica aerogels with low cost materials and drying condition has attracted great attention in the past years [21], [22], [23]. Industrial by-products rich in silica such as fly ash, rice husk ash and used bagasse ashes are proven to have great potential as raw material for preparing silica aerogels [24], [25], [26] .
The biomimetic method and microemulsion methods of synthesis provide a superior level of surface chemistry and morphological control than current industrial processes and are the major focus of current silica synthesis research.
The resultant silica aerogel has high hydrophobicity and a mesoporous structure with a pore volume exceeding 4.0 cm3·g−1 and a specific surface area exceeding 950 m2·g−1. The obtained silica aerogel/fiber-glass-mat composite has high thermal insulation, with a thermal conductivity of less than 0.020 W·m−1·K−1.
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WEBMost industrial silica is made from natural sources. Quartz and quartzite are the most stable and pure polymorphs of silica found in almost all mineralogical rocks. These rocks …
A novel and sustainable process to recycle an environmentally injurious material rich in silica—waste bagasse bottom ash from the sugar industry—into mesoporous pure silica of high purity is reported. Bagasse bottom ash (BBA) is a major byproduct of the sugar industry, with very inadequate recycling possibilities due to …
Article. Silica aerogels; a review of synthesis, applications and fabrication of hybrid composites. Published: 14 May 2021. Volume 28, pages 1387–1400, ( 2021 ) Cite …
In general, the industrial waste silicon sludge (WSS), composed of silicon, SiC, and silica, were generated after separating the larger SiC, polyethylene glycol solution, and additives in the kerf loss silicon. ... Silica preparation. Each experiment was performed by dissolving a certain amount of sodium hydroxide in 20 ...
Porous materials have promise as sound insulation, heat barrier, vibration attenuation, and catalysts. Most industrial solid wastes, such as tailings, coal gangue, and fly ash are rich in silicon. Additionally, a high silicon content waste is a potential raw material for the synthesis of silicon-based, multi-porous materials such as zeolites, mesoporous …
1. Introduction. Silica is one of the most studied material for the preparation of both mesoporous and microporous inorganic membranes. Silica membranes can be potentially applied in several industrial processes for efficient separations or for chemical synthesis in innovative membrane reactors (e.g., hydrogen production).
Developing more sustainable and economical viable strategies to access high value-added products from alternative and less costly sources is currently a challenge in the chemical industry. Silica is among the most used chemicals and is widely used in many industrial applications such as toothpastes as a cleansing agent, rubber industry …
The ability of a rapid supercritical extraction (RSCE) process implemented in an industrial hot press to produce silica aerogel monoliths (AMs) with properties suitable for use in fenestration products was investigated. The effects of hot-press processing parameters such as press force and heat-up and cool-down rates on the size (area) and quality …
Silica nanoparticles have received an intensive attention of scientific community due to its broad applications in industry. The optical properties of silica nanoparticles can be attained with respect to surface defect related to large surface/volume ratio according to the applications. ... Further, Wang and coworkers have reported …
The most documented method for the preparation of silica is the sol-gel route. In this process, Si (OH) 4 molecules condense to form a siloxane network. As a starting …
Systematic preparation of high-quality colloidal silica particles by sol–gel synthesis using reagents at low temperature. José-Miguel Zárate-Reyes, Erick Flores-Romero, Juan-Carlos Cheang-Wong. …
erties. (part 1). Most industrial silica is made from natural sources. Quartz and quartzite are the most stable and pure polymorphs of silica found in almost all mineralogical rocks. ... [25–28]. Particularly, the thermal approach to the preparation of bio-silica from biomass is relatively easy and cost-effective, and it also requires lesser ...
Synthesis of SiNPs from solid wastes is a remarkably good alternative for costly commercial silica precursors. Several agro-wastes such as rice husk, wheat husk, sugarcane bagasse and leaves, bamboo leaves, walnut shell, and orange peel, industrial wastes like fly ash, plastic wastes, and wastes from photonic industries have been …
Abstract. Silica nanoparticles were prepared from tetraethylortho-silicate (TEOS) dissolved in ethanol by using a semi-batch process in order to control the …
Abstract. In this paper, spherical silica was prepared with tetraethyl orthosilicate (TEOS) as the silicon source and cetylpyridine bromide (CPB) as the template, the time and temperature of microwave digestion and the influence of urea content in the solution on the shape and particle size of silica were discussed, and the silica was ...
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