Silica aerogel; synthesis, properties and characterization

Dorcheh, A. Soleimani; Abbasi, M.H.

doi:10.1016/j.jmatprotec.2007.10.060

Cited by 1,145 publications

(405 citation statements)

References 151 publications

Supporting

Mentioning

394

Contrasting

Unclassified

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

“…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

View full text Add to dashboard Cite

show abstract

“…In addition, the porosity, bulk density, and average particle size were calculated using Eqs. (1)- (3), respectively: (19)(20)(21) …”

Section: Characterization Of Mineral Wool-aerogel Compositementioning

confidence: 99%

To Improve the Thermal Properties of Mineral Wool by Adding Aerogel

Hsu

Chen

et al. 2017

Sensors and Materials

View full text Add to dashboard Cite

To reduce the cost of fuel and heat loss from pipe surfaces, insulation needs to cover pipes when high temperature fluids are transported through them. Mineral wool has not only low heat conductivity but also good thermal and flame resistant properties. It can be used in a wide range of applications. To improve the performance of thermal insulation, it can be used in a composite material in combination with other insulating materials. Aerogel is regarded as one of the most promising high performance thermal insulation materials today, but only limited commercial products are available thus far due to cost and reliability factors. In this study, aerogel is produced in mineral wool using an ambient pressure drying process. The purpose of this study is to investigate the thermal performance of mineral wool-aerogel composite to meet the requirements for industrial applications. The experimental results indicated that silica aerogel can be successfully produced in mineral wool using an ambient pressure drying process. The cost and production time of this proposed process can be significantly decreased. As aerogel is mixed with mineral wool, the measured thermal conductivity of mineral wool-aerogel composite can be reduced from 0.071 to 0.055 W/m·K.

show abstract

“…In order to solve these problems, a series of methods are adopted to modify the water glass during the past decades. The experimental results show that [3]- [6] the aging can be temporarily eliminated, depending on providing energy to the water glass system by physical methods, such as heating reflux, autoclave, magnetization and ultrasonography, etc., but re-aging will happen after storage for a short time. Therefore, it also relies on chemical method, namely adding chemical reagents to the water glass (usually containing -COOH, CO-NH 2 , C=O, -NH 2 , -OH polar groups of organic reagent), to change its polymerization properties, thus retard the aging phenomenon, such kind of work has been reported [7] [8], but most of them are qualitative experiment, and it's not very clear how the various silicate species change and what role of the chemical mechanism is during the aging of water glass.…”

Section: Introductionmentioning

confidence: 99%

Influences of SiO<sub>2</sub>/Na<sub>2</sub>O Molar Ratio on Aging and Chemical Modification of Water Glass

Yang¹,

Xu²,

Frank³

et al. 2016

OJIC

View full text Add to dashboard Cite

In this paper, the content of water glass before and after adding modifying agent was measured by Trimethylsilyl-gas-chromatography. The experimental results showed that different modulus of water glass could generate different content of mono-silicate acid and oligomeric silicate acid in water glass. After a period of storage, different modulus of water glass led to decrease of silicate content at different levels. Because higher content of Na 2 O in water glass tended to incur the alkaline polymerization, the occurrence of depolymerization of silicate species would lead to an increase of oligomeric silicate species, resulting in a drawback of silicate species content after a period of storage. And contrary to that, lower content of Na 2 O in water glass tended to incur the acidic polymerization. When the modifying agent was added to the newly made water glass, the amount of mono-silicate acid and oligomeric silicate acid also decreased. In modified water glass, the change of each silicate acid species was less than that in unmodified water glass. These results showed that the modifying agent retarded the aging of water glass. It had remarkable significance on the theory and practical application of water glass chemistry.

show abstract

Silica aerogel; synthesis, properties and characterization

Cited by 1,145 publications

References 151 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

To Improve the Thermal Properties of Mineral Wool by Adding Aerogel

Influences of SiO<sub>2</sub>/Na<sub>2</sub>O Molar Ratio on Aging and Chemical Modification of Water Glass

Contact Info

Product

Resources

About

Silica aerogel; synthesis, properties and characterization

Cited by 1,145 publications

References 151 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

To Improve the Thermal Properties of Mineral Wool by Adding Aerogel

Influences of SiO&lt;sub&gt;2&lt;/sub&gt;/Na&lt;sub&gt;2&lt;/sub&gt;O Molar Ratio on Aging and Chemical Modification of Water Glass

Contact Info

Product

Resources

About

Influences of SiO<sub>2</sub>/Na<sub>2</sub>O Molar Ratio on Aging and Chemical Modification of Water Glass