Preparation method of highly-hydrophobic silicon dioxide aerogel

A hydrophobic silica and airgel technology, applied in the direction of silica, silicon oxide, chemical instruments and methods, etc., can solve the problems of low mechanical performance and poor recycling rate, so as to improve mechanical performance and oil absorption The effect of increasing the amount and improving the recycling rate

Active Publication Date: 2016-07-27
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the disadvantages of poor recycling rate and low mechanical properties of silica airgel in the prior art, the present invention provides a low-cost, high-hydrophobic silica airgel with good mechanical properties and high recycling rate. Preparation

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  • Preparation method of highly-hydrophobic silicon dioxide aerogel
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  • Preparation method of highly-hydrophobic silicon dioxide aerogel

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preparation example Construction

[0024] A kind of preparation method of highly hydrophobic silica airgel of the present invention, specific preparation process is as follows figure 1 shown, including the following steps:

[0025] In the first step, the Fe 3 o 4 Ultrasonic dispersion in 8-12mL of ethanol aqueous solution with a mass fraction of 40%-60% to form Fe with a mass concentration of 1.1mg / mL 3 o 4 Uniform dispersion.

[0026] In the second step, add 2-3mL of TEOS, 2-3mL of DMF and 1.8-2.2mL of APS to the homogeneous dispersion obtained in the first step, stir it evenly with ultrasonic waves, then transfer the mixture into a sealed glass bottle and continue mechanically The stirring hydrolysis reaction completely obtains the solid gel precursor;

[0027] In the third step, 0.9-1.1 mL of NH 3 ·H 2 O is added to the solid gel precursor and left to stand to form a silica solid gel;

[0028] In the fourth step, add 6-8 mL of ethanol solution with a mass fraction of 50% and 1.8-2.2 mL of MTMS for se...

Embodiment 1

[0030] In the first step, the Fe 3 o 4 Ultrasonic dispersion in 8mL ethanol aqueous solution, ultrasonic dispersion at 25°C for 15min, to form Fe with a mass concentration of 1.1mg / mL 3 o 4 Uniform dispersion, wherein the ethanol solution is composed of 5mL absolute ethanol and 3mL deionized water;

[0031] In the second step, add 2mL of TEOS, 2mL of DMF and 1.8mL of APS to the uniform dispersion obtained in the first step, sonicate for 10min until uniform, then transfer the mixture into a sealed glass bottle and continue mechanical stirring for 5h to obtain solidification Glue precursor;

[0032] In the third step, 0.9 mL of NH 3 ·H 2 O was added to the solid gel precursor and left to stand for 5 minutes to form a silica solid gel;

[0033] In the fourth step, 6 mL of ethanol solution with a mass fraction of 50% and 1.8 mL of MTMS were added for self-assembly for 16 hours. After the reaction, they were washed several times with absolute ethanol and deionized water, and ...

Embodiment 2

[0035] In the first step, the Fe 3 o 4 Ultrasonic dispersion in 10mL ethanol aqueous solution, ultrasonic dispersion at 25°C for 15min, to form Fe with a mass concentration of 1.1mg / mL 3 o 4 Uniform dispersion, wherein the ethanol solution is composed of 6mL absolute ethanol and 4mL deionized water;

[0036] In the second step, add 2.5mL of TEOS, 2.5mL of DMF and 2.0mL of APS to the uniform dispersion obtained in the first step, sonicate for 15min until uniform, then transfer the mixture into a sealed glass bottle and continue to stir mechanically for 6h to obtain solid gel precursor;

[0037] In the third step, 1.0 mL of NH 3 ·H 2 O was added to the solid gel precursor and left to stand for 7 minutes to form a silica solid gel;

[0038] In the fourth step, 7 mL of ethanol solution with a mass fraction of 50% and 2.0 mL of MTMS were added for self-assembly for 17 hours. After the reaction, they were washed several times with absolute ethanol and deionized water, and drie...

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Abstract

The invention discloses a preparation method of highly-hydrophobic silicon dioxide aerogel. The preparation method comprises the following steps: ultrasonically dispersing Fe3O4 nano micro-spheres into an ethanol solution; adding ethyl orthosilicate, dimethylformamide and 3-aminopropyl trimethylsilane at room temperature; after uniformly stirring, adding NH3.H2O and curing; and finally, carrying out surface hydrophobic modification through methyltrimethoxysilane to prepare the highly-hydrophobic silicon dioxide aerogel. The silicon dioxide aerogel disclosed by the invention has high chemical stability, relatively large specific surface area, excellent mechanical properties, and high recycling utilization ratio, still has relatively high adsorption capability and hydrophobic property after being repeatedly utilized, has good durability, and has a wide application prospect in the aspect of industrial large-scale oil pollution treatment.

Description

technical field [0001] The invention relates to a preparation method of highly hydrophobic silica airgel, which belongs to the technical field of environment-friendly oil-absorbing materials. Background technique [0002] Since the 1950s, with the rapid development of social productivity and science and technology in various countries, oceans and rivers have been polluted and damaged to varying degrees from various aspects. The increasingly serious pollution has brought extremely serious consequences to human survival and development negative effect. Therefore, it is urgent to solve the problem of ocean and river water pollution. Traditional oil removal methods include mechanical recovery, combustion, and adsorption of oil-absorbing materials. The former two have disadvantages such as high energy consumption and secondary pollution, while the adsorption of oil-absorbing materials has been more recognized. How to develop high-efficiency, low-energy-consumption, green and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C01B33/16
CPCB01J20/103B01J20/28009B01J20/28047C01B33/16C01P2004/03C01P2004/04
Inventor 姜炜宋敏郁榴华王玉姣谢覃夏梦婷刘诗怡龚张弛王素云肖磊
Owner NANJING UNIV OF SCI & TECH
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