Preparation and evaluation of Au nanoparticle–silica aerogel nanocomposite

Katagiri, Naruhito; Ishikawa, M.; Adachi, Nobuyasu; Fuji, Masayoshi; Ota, Toshitaka

doi:10.1016/j.jascer.2015.01.003

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…Silica aerogel preparation was carried out by the sol-gel process (13,(16)(17)(18). At first, the original sol was produced by preparing a saturated solution of Na 2 SiO 3 .…”

Section: Adsorbent Preparationmentioning

confidence: 99%

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

et al. 2018

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This study evaluated silica aerogel as an adsorbent for phenol removal from aqueous solutions. Silica aerogel was prepared through the sol-gel process and characterized by different analyses. Then, it was used for phenol removal under various conditions of operational parameters. Also, twelve isotherm parameters were employed to describe the behavior of phenol-silica aerogel adsorption system. The chemical structural analysis confirmed -OH functional groups in amorphous SiO2 and proved the adsorption of phenol onto the surface of silica aerogel. The findings of the adsorptive behavior of silica aerogel toward phenol showed increasing pH, up to 8.5, and contact time, and adsorbent dose increased the phenol removal. The removal efficiency reached over 90% when phenol concentration was below 50 mg L -1 . The reaction kinetics followed the pseudo-first order model. The isotherm study showed that equilibrium adsorption data were well-described by Freundlich and Halsey equations, among two-parameter isotherms, and Hill, Sips, and Koble-Corrigan, among three-parameter isotherms. Jovanovic and BET were the worst isotherm models for prediction of experimental equilibrium data. The maximum adsorption capacity of 75.23 mg.g -1 was calculated in phenol-silica aerogel adsorption system. The study showed silica aerogel as an efficient adsorbent to remove phenol from phenol-containing solutions.

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“…Silica aerogel preparation was carried out by the sol-gel process (13,(16)(17)(18). At first, the original sol was produced by preparing a saturated solution of Na 2 SiO 3 .…”

Section: Adsorbent Preparationmentioning

confidence: 99%

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

et al. 2018

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“…These features give it great potential for application in the fields of heat science, optics and catalysts. So far, some routes have been developed to synthesize silica aerogels, for example, using tetraethylorthosilicate (TEOS) or tetramethylorthosilicate (TMOS) as a silicon precursor and the supercritical fluid extraction technique for the drying of the gels, which can synthesize excellent aerogels with high porosity [6,7]. However, these routes for synthesizing aerogels have some issues, such as complicated processing, high cost and safety problems.…”

Section: Introductionmentioning

confidence: 99%

Ambient-Dried Silica Aerogel Powders Derived from Coal Gangue by Using One-Pot Method

2022

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In this paper, we report a new and convenient method for the synthesis of insulating aerogel by recycling solid waste coal gangue, which can reduce the industrial production cost of silica aerogels and realize high value-added utilization of solid waste. Sodium silicate was prepared from a cheap industrial waste coal gangue as the precursor for silica aerogels, which was used for silica wet gel preparation by a one pot method; this method of solvent exchange/surface modification was carried out quickly by mechanical stirring process, and the wet gels derived from coal gangue were dried under ambient pressure condition. A high surface area (~748 m2/g) nanostructured aerogel with a 3D open porous microstructure was synthesized, which exhibits a low density (~0.18 g/cm3) and a superior thermal insulation performance (~0.033 W·m−1·K−1). More significantly, the synthetic yield of silica aerogel powder by recycling coal gangue can reach 92%.

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“…The obtained nanomaterial is characterized by high porosity coming from the silica aerogel and magnetic, optical, or electrical properties from the metallic nanoparticles. In such a way, the following metallic or bimetalic systems were obtained: Fe/SiO 2 [ 11 ], Ag/SiO 2 [ 12 ], Au/SiO 2 [ 13 , 14 ], Cu/SiO 2 [ 15 ], Ni/SiO 2 [ 16 ], Fe 2 O 3 /SiO 2 [ 17 , 18 , 19 ], TiO 2 /SiO 2 [ 20 ], SnO 2 /SiO 2 [ 21 ], Fe/Mo/SiO 2 [ 22 ], and Fe/Co/SiO 2 [ 23 ]. The disadvantage of such a solution is an increase of the nanocomposite weight.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Research on the Synthetic Fiber Based Silica Aerogel Nanocomposites

Ślosarczyk

2017

Nanomaterials

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The presented paper contains a brief review on the synthesis and characterization of silica aerogels and its nanocomposites with nanofibers and fibers based on a literature study over the past twenty years and my own research. Particular attention is focused on carbon fiber-based silica aerogel nanocomposites. Silica aerogel is brittle in nature, therefore, it is necessary to improve this drawback, e.g., by polymer modification or fiber additives. Nevertheless, there are very few articles in the literature devoted to the synthesis of silica aerogel/fiber nanocomposites, especially those focusing on carbon fibers and nanofibers. Carbon fibers are very interesting materials, namely due to their special properties: high conductivity, high mechanical properties in relation to very low bulk densities, high thermal stability, and chemical resistance in the silica aerogel matrix, which can help enhance silica aerogel applications in the future.

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Preparation and evaluation of Au nanoparticle–silica aerogel nanocomposite

Cited by 8 publications

References 24 publications

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

Ambient-Dried Silica Aerogel Powders Derived from Coal Gangue by Using One-Pot Method

Recent Advances in Research on the Synthetic Fiber Based Silica Aerogel Nanocomposites

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