Preparation of Silica-Based Mesoporous Materials From Fluorosilicon Compounds: Gelation of H2SiF6in Ammonia Surfactant Solution

Polybutadiene rubber (BR) hybrid composites reinforced with mesoporous silica (MPS)/nanoclays, silica and MPS/carbon black were prepared. The primary focus of this research was to incorporate the mesoporous silicate (MPS), e.g., mobil composition of matter (MCM-41) as reinforcing filler in the BR matrix. The textural properties of the mesoporous materials were characterized by powder X-ray diffraction (XRD), transmission electron microscopy and N 2 isothermal adsorption measurements. The quantity of MCM-41 in the BR matrix was first optimized and the similar optimized quantity of different MPS was compared in terms of tensile strength. The composites were characterized by XRD and scanning electron microscopy. The composite containing 10 phr-loaded MCM-41 showed 250 % improvement in tensile strength compared to the matrix devoid of nanomaterial. The effects of co-incorporation of two different kinds of nanomaterials having different nanostructures, e.g., layered montmorillonite and particulate MCM-41 were also studied. MCM-41 enhanced the mechanical strength of BR almost double the value compared to precipitated silica at the same filler loading. The morphological features of the composites were well corroborated with the mechanical properties.

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“…The TEM images (Fig. 2a) confirm the regular hexagonal array of uniform channels for MCM-41 [21]. TEM micrographs (Fig.…”

Section: Transmission Electron Microscopy (Tem) Analysismentioning

confidence: 56%

Mesoporous silica reinforced polybutadiene rubber hybrid composite

et al. 2016

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“…Although various modes of silica recovery and general utilization of hexafluorosilicic acid have been reported [3,[6][7][8][9][10][11][12][13], a mesoporous silica with high surface area (recovered from Fertilizer Industries wastes) is not yet reported. Moreover, the recovery processes suggested were tedious and non-economical for large scale production.…”

Section: Introductionmentioning

confidence: 99%

Recovery of high surface area mesoporous silica from waste hexafluorosilicic acid (H2SiF6) of fertilizer industry

Sarawade

Kim²,

Hilonga

et al. 2010

Journal of Hazardous Materials

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“…Here, Si(OH) 4 groups form hydrogen bonds with the oxygens of the polyoxyethylene chains, which promotes the formation of SiO(OH) 3 − anions to induce SiO 2 precipitation. SiF 6 2− ions in aqueous cationic or nonionic surfactant solutions also precipitate into SiO 2 within several seconds (even in acidic solutions with pH 3–4) 15,17,27 which is ascribed to the mineralization-promoting action of F – ions, similar to that of OH − ions. Therefore, the gelation of Na 2 SiO 3 with H 2 SiF 6 in the aqueous surfactant solution was promoted by the mineralizing effect of the F − ions and the electrostatic or dipolar interactions between the surfactant micelles and silica monomers (Si(OH) 4 , SiO(OH) 2 2− , SiO 2 (OH) 3 − , etc.).…”

Section: Resultsmentioning

confidence: 99%

“…Generally, high-purity mesoporous silica (MS) is prepared from silica gel or tetraethylorthosilicate. However, recent studies utilized sodium silicate (Na 2 SiO 3 ) 13,16 or fluorosilicic acid (H 2 SiF 6 ) 15–17 as precursors to minimize problems such as waste solution treatment, which is time-consuming, expensive, and requires the use of non-aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mesoporous Silica by Nonionic Surfactant Micelle–Templated Gelation of Na2SiO3 and H2SiF6 and Application as a Catalyst Carrier for the Partial Oxidation of CH4

Park

Kim

Seo

et al. 2019

Sci Rep

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Mesoporous silica (MSPN12) was prepared by nonionic surfactant micelle–templated gelation of sodium silicate (Na2SiO3) and fluorosilicic acid (H2SiF6) in aqueous solution, characterized by a range of instrumental techniques, and tested as a support for Ni and Rh catalysts in the partial oxidation of methane (POM). Calcined and sintered MSPN12 exhibited well-defined d00l-spacings (3.5–4.39 nm), narrow pore distributions (2.4–3.1 nm), and large specific surface areas (552–1,246 m2 g−1), and was found to be highly thermally stable. Microscopic imaging revealed that MSPN12 comprised spherical particles with a uniform diameter of ~0.7 µm, with each particle featuring firm and regular honeycomb-type pores. MSPN12-loaded Ni and Rh maintained stable POM activity at 700 °C during almost 100 h on stream, which were comparable to those for the commercial Rh(5)/Al2O3 catalyst in terms of methane conversion and H2 formation selectivity. Thus, the combination of structural stability and favorable physicochemical properties resulted in good POM performance.

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Preparation of Silica-Based Mesoporous Materials From Fluorosilicon Compounds: Gelation of H2SiF6in Ammonia Surfactant Solution

Cited by 19 publications

References 11 publications

Mesoporous silica reinforced polybutadiene rubber hybrid composite

Mesoporous silica reinforced polybutadiene rubber hybrid composite

Recovery of high surface area mesoporous silica from waste hexafluorosilicic acid (H2SiF6) of fertilizer industry

Preparation of Mesoporous Silica by Nonionic Surfactant Micelle–Templated Gelation of Na2SiO3 and H2SiF6 and Application as a Catalyst Carrier for the Partial Oxidation of CH4

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