Synthesis of sodium silicate-based silica aerogels with graphene oxide by ambient pressure drying

Cakmak, Oznur Kaya; Hassan, Khalil T.; Wang, Jiabin; Han, Xiao; Šiller, Lidija

doi:10.1007/s10934-021-01103-2

Cited by 11 publications

(4 citation statements)

References 44 publications

(61 reference statements)

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“…By further increasing the GO content, however, S BET decreased. Like hydrolyzed sodium silicate, the hydrolyzed TEOS has excess –OH content, and a small amount of GO can offer higher mesoporous volume to the structure, , resulting in a higher S BET .…”

Section: Resultsmentioning

confidence: 99%

Melamine Network as a Solution for Significant Enhancement of the Mechanical, Adsorptive, and Surface Properties in a Novel Carbon Nanomaterial–Silica Aerogel Composite

Fashandi,

Rejeb,

Naguib

et al. 2024

ACS Appl. Mater. Interfaces

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Silica aerogels exhibit exceptional characteristics such as mesoporosity, light weight, high surface area, and pore volume. Nevertheless, their utilization in industrial settings remains constrained due to their brittleness, moisture sensitivity, and costly synthesis procedure. Several studies have proved that adding nanofillers, such as carbon nanotubes (CNT) or graphene nanoplatelets (GNP), can improve the mechanical strength of the aerogels. The incorporation of nanofillers is often accompanied by agglomeration and pore blockage, which, in turn, deteriorates the surface area, pore volume, and low density. Including flexible melamine foam (MF) as a scaffold for the silica aerogel and nanofiller composite can prevent the restacking of the nanofillers through π−π interaction, hence maintaining the incredible properties of aerogels and improving their mechanical properties. CNT, GNP, and the polymeric silica precursor, polyvinyltrimethoxysilane (PVTMS), were added to a MF, at varying concentrations, to fabricate the MF-aerogel nanocomposites. Surfactant and sonication were utilized to ensure a homogeneous dispersion of the nanofillers in the system. The presence of MF prevented the agglomeration of nanofillers, resulting in lower density and relatively higher surface properties (S BET up to 929 m 2 •g −1 and pore volume up to 4.34 cc•g −1 ). Moreover, the MF-supported samples could endure 80% strain without breakage and showed an outstanding compressive strength of up to ∼20 MPa. These aerogel nanocomposites also demonstrated an excellent volatile organic compound (∼2680 mg•g −1 ) and cationic dye adsorption (∼10 mg•g −1 ).

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Section: Resultsmentioning

confidence: 99%

Melamine Network as a Solution for Significant Enhancement of the Mechanical, Adsorptive, and Surface Properties in a Novel Carbon Nanomaterial–Silica Aerogel Composite

Fashandi,

Rejeb,

Naguib

et al. 2024

ACS Appl. Mater. Interfaces

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“…However, a key spectra is the presence of a band in silica gel at around 950 cm -1 , attributed to the O-H stretching vibration of silanol groups (SiOH) (Cakmak et al, 2021).…”

Section: Moisture Adsorption Capacity Measurementmentioning

confidence: 99%

Green synthesis of silica gel adsorbents: microwave boosts silanol groups for improved moisture uptake

Salsabila,

Khair,

Ardi

et al. 2024

Braz. J. Develop.

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This research investigates the influence of microwave irradiation on the silanol content and moisture adsorption capacity of silica gel prepared from clear glass waste. Employing a green and efficient microwave-assisted synthesis method, we demonstrate rapid formation of silica gel with enhanced properties. Fourier-transform infrared (FTIR) analysis confirms the presence of silanol (Si-OH) groups on the synthesized gel, with a focus on the characteristic peak at 956.44 cm⁻¹ indicating their abundance. Notably, the peak area of this peak significantly increases with increasing irradiation time (5 to 15 minutes). This translates to a parallel increase in moisture adsorption capacity, rising from 56% to 82%. The enhanced silanol content suggests the potential of microwave-derived silica gel as a high-performance desiccant, as these groups directly contribute to moisture binding. Our findings highlight the promising potential of waste glass valorization via microwave synthesis for developing sustainable and effective moisture adsorbents.

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“…Therefore, aerogels produced, ipso facto, via supercritical drying are to be directed as most appropriate for use in relation to highly specialized purposes. Ambient-pressure drying provides for a less energy-intensive alternative route, but commonly relies on replacing the original solvent used for gel preparation which is also costly [3,4]. During recent decades, noticeable advancements have occurred in aerogel synthesis, whilst different types of aerogels have been produced [2].…”

Section: Introductionmentioning

confidence: 99%

The Importance of Precursors and Modification Groups of Aerogels in CO2 Capture

2021

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The rapid growth of CO2 emissions in the atmosphere has attracted great attention due to the influence of the greenhouse effect. Aerogels’ application for capturing CO2 is quite promising owing to their numerous advantages, such as high porosity (~95%); these are predominantly mesoporous (20–50 nm) materials with very high surface area (>800 m2∙g−1). To increase the CO2 level of aerogels’ uptake capacity and selectivity, active materials have been investigated, such as potassium carbonate, K2CO3, amines, and ionic-liquid amino-acid moieties loaded onto the surface of aerogels. The flexibility of the composition and surface chemistry of aerogels can be modified intentionally—indeed, manipulated—for CO2 capture. Up to now, most research has focused mainly on the synthesis of amine-modified silica aerogels and the evaluation of their CO2-sorption properties. However, there is no comprehensive study focusing on the effect of different types of aerogels and modification groups on the adsorption of CO2. In this review, we present, in broad terms, the use of different precursors, as well as modification of synthesis parameters. The present review aims to consider which kind of precursors and modification groups can serve as potentially attractive molecular-design characteristics in promising materials for capturing CO2.

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Synthesis of sodium silicate-based silica aerogels with graphene oxide by ambient pressure drying

Cited by 11 publications

References 44 publications

Melamine Network as a Solution for Significant Enhancement of the Mechanical, Adsorptive, and Surface Properties in a Novel Carbon Nanomaterial–Silica Aerogel Composite

Melamine Network as a Solution for Significant Enhancement of the Mechanical, Adsorptive, and Surface Properties in a Novel Carbon Nanomaterial–Silica Aerogel Composite

Green synthesis of silica gel adsorbents: microwave boosts silanol groups for improved moisture uptake

The Importance of Precursors and Modification Groups of Aerogels in CO2 Capture

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