Preparation of Silica Aerogel by Ambient Pressure Drying Process using Rice Husk Ash as Raw Material

2009 ◽  
Vol 68 (2) ◽  
pp. 91-94 ◽  
Author(s):  
J. P. Nayak ◽  
J. Bera
Keyword(s):  
Rice Husk ◽  
Silica Aerogel ◽  
Rice Husk Ash ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Raw Material ◽  
Drying Process

Synthesis and Characterization of Rice Husk Ash Derived - Silica Aerogel Beads Prepared by Ambient Pressure Drying

2016 ◽  
Vol 694 ◽  
pp. 106-110 ◽  
Author(s):  
Zulhelmi Alif Abdul Halim ◽  
Muhamad Azizi Mat Yajid ◽  
Halimaton Hamdan
Keyword(s):  
Rice Husk ◽  
Silica Aerogel ◽  
Rice Husk Ash ◽  
Ambient Pressure ◽  
Nitrogen Adsorption ◽  
Ambient Pressure Drying ◽  
Synthesis And Characterization ◽  
Gel Beads ◽  
Desorption Method

Low density silica aerogel beads were synthesized from rice husk ash via sodium silicate route. The gel beads were prepared by the ball dropping method and dried at ambient pressure after surface modification (silylation) with trimethylchlorosilane (TMCS) solution. The characteristics of porous structure of silica aerogel beads were measured by Brunauer-Emmett-Teller (BET) nitrogen adsorption and desorption method. The silica aerogel beads showed a specific surface area as high as 773 m2/g. They also displayed water-repellant effect (hydrophobic) due to silylation as revealed by Fourier transform infrared spectroscopy (FTIR).

scholarly journals Synthesis and Characterization of Silica Aerogel from Rice Husk with Ambient Pressure Drying Method

2020 ◽  
Vol 1535 ◽  
pp. 012049
Author(s):  
Nor Fadilah Mohamad ◽  
Noor Hidayu Abdul Rani ◽  
Omar Syah Jehan Elham ◽  
Siti Hajar Anaziah Muhamad ◽  
Siti Afifah Muda ◽  
...  
Keyword(s):  
Rice Husk ◽  
Silica Aerogel ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Synthesis And Characterization ◽  
Drying Method

Synthesis and Characterization of Amine Impregnated Silica Aerogel from Rice Husk for CO2 Adsorption

2020 ◽  
Vol 13 ◽  
Author(s):  
A.R. Hidayu ◽  
N.F. Mohammad ◽  
S.I.S. Jamaludin ◽  
N.F.M.K. Teo ◽  
N.S.M. Sah ◽  
...  
Keyword(s):  
Rice Husk ◽  
Silica Aerogel ◽  
Co2 Adsorption ◽  
Sodium Hydroxide Solution ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Ambient Pressure Drying ◽  
Modified Silica ◽  
Rice Husk Silica ◽  
Wide Range

Abstract: Rice husk has attracted considerable attention in the recent years due to its chemical component that are beneficial to a wide range of application. . In this paper, silica aerogel from rice husk ash (RHA) was prepared through sol-gel processing and ambient pressure drying. The silica RHA was extracted with sodium hydroxide solution to produce sodium silicate solution and neutralized with sulphuric acid to form silica gel. Then, the silica aerogel was further modified with amine, which is 3-(aminopropyl) triethoxysilane (APTES) because amine groups provide specific adsorption sides for CO2 adsorption. The functional group, surface morphology and elemental composition of rice husk, silica aerogel and modified silica aerogel were characterized by Fourier transform infrared spectroscopy (FTIR), Scanning Electronic Microscopy (SEM) and Elemental analyser (EA). For amine modified silica aerogel, it was found that the sample consists of N-H band at a certain peak. FTIR and SEM analysis revealed the synthesized silica aerogel has fibrous morphology and indicates similar trend with previous researches. The amine modified silica aerogel (AMSA) is able to adsorb 0.88 mol CO2/kg AMSA. This study shows that the rice husk silica aerogel modified with APTES could enhance the CO2 adsorption performance due to the physisorption and chemisorption

A type of thiophene-bridged silica aerogel with a high adsorption capacity for organic solvents and oil pollutants

2018 ◽  
Vol 5 (8) ◽  
pp. 1894-1901 ◽  
Author(s):  
Yuetao Liu ◽  
Jiawen Sun ◽  
Junguo Yuan ◽  
Shuai Wang ◽  
Yu Ding ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Organic Solvents ◽  
Silica Aerogel ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Ambient Pressure Drying ◽  
Tetraethyl Orthosilicate ◽  
Drying Process ◽  
High Adsorption ◽  
High Adsorption Capacity

Thiophene-bridged silica aerogel was prepared from tetraethyl orthosilicate (TEOS) and 2,5-divinyltrimethoxysilanethiophene (DVTHP) through a facile sol–gel reaction and ambient pressure drying process.

A Study on a Green Route to Preparation of Silica Powders with Rice Husk Ash

2014 ◽  
Vol 1010-1012 ◽  
pp. 1015-1019
Author(s):  
Ze Xin Yang ◽  
Lin Dong ◽  
Meng Wang ◽  
Huan Li
Keyword(s):  
Sodium Bicarbonate ◽  
Sodium Silicate ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Sodium Hydroxide Solution ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Raw Material ◽  
Transmission Electron ◽  
Thermal Analyzer

The main purpose of this article is to develop an environmentally friendly and economically effective process to produce silica from rice husk ash. Sodium silicate solution was prepared by the reaction of rice husk ash and sodium hydroxide solution, and then the sodium silicate solution was used as the raw material for the preparation of silica with sodium bicarbonate. During the reaction, the by-product can be passed into CO2 to prepare sodium bicarbonate what can be reutilized. Experimental route achieved resource recycling and environment-friendly, low energy consumption, zero emissions and so on. Meanwhile the microstructures of the silica powders were characterized by Transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Thermo gravimetric/Differential thermal analyzer (TG-DTA).The purity of silicon was up to 99.43% and the particle size was 200-300nm.

The Microwave-Assisted Preparation and Properties of SiO2 Aerogels by Fractional Modification

2010 ◽  
Vol 148-149 ◽  
pp. 1152-1162 ◽  
Author(s):  
Wen Zhi Zheng ◽  
Li Chen ◽  
Xiang Hua Huang ◽  
Lei Fu
Keyword(s):  
Ambient Pressure ◽  
Sol Gel ◽  
Ambient Pressure Drying ◽  
Base Catalysis ◽  
Raw Material ◽  
Microwave Method ◽  
Scanning Calorimetry ◽  
Hydrophobic Sio2 ◽  
Water Bath Heating ◽  
Fractional Modification

Under microwave radiation and using trimethyl chlorosilane as modifier, hydrophobic SiO2 aerogel was prepared through fractional hydrophobic modification and ambient pressure drying of the raw material, tetraethoxysilane (TEOS), in the process of sol-gel and acid-base catalysis. Hydrophilic SiO2 aerogels were also prepared using the microwave method and water bath heating method. The SiO2 aerogels prepared using the three methods, including their morphology and chemical composition, were analyzed and compared using scanning electron microscopy, Brunauer-Emmett-Teller analysis method, Fourier transform infrared spectroscopy, X-ray diffraction, and themogravimetric-differential scanning calorimetry. The results indicate that by adopting the microwave reaction, the specific surface area of the SiO2 aerogels was effectively increased and the structure of the internal nanoscale pores of petal-coated shape was found to exist under the dense external surface of the SiO2 aerogels. Thermal stability of the hydrophobic SiO2 aerogels prepared through fractional modification assisted by the microwave method was increased with the hydrophobic angle at153°, which showed super hydrophobicity.

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