Preparation of a modified nano-silica airgel

A nano-silica and aerogel technology, applied in inorganic chemistry, silicon compounds, chemical instruments and methods, etc., can solve the problems of poor adsorption effect and slow hydrolysis speed, and achieve the effect of uniform adsorption site and preferential adsorption.

Active Publication Date: 2020-12-22
无针科技集团河北有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the slow hydrolysis speed of silica airgel preparation and poor adsorption effect, and propose a kind of preparation of modified nano silica airgel, effectively solve the hydrolysis speed of silica airgel preparation Slow, poor adsorption effect

Method used

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  • Preparation of a modified nano-silica airgel
  • Preparation of a modified nano-silica airgel
  • Preparation of a modified nano-silica airgel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation of modified nano silicon dioxide airgel, comprises the following steps;

[0026] S1. Take 1mol TEOS and 1mol absolute ethanol and mix them into a 500ml beaker, then add 0.0005moL of KH550 dropwise, then add hydrochloric acid dropwise into the beaker, adjust the pH value to 3-4, and then place the beaker on a magnetic rotor stirrer , maintaining the temperature at 60-65°C and stirring for 25-30min to obtain a mixed solution A;

[0027] S2. Add ammonia water dropwise to the mixed solution in S1, adjust the pH value to 7-8, and continue stirring for 80-90min to obtain mixed solution B;

[0028] S3. Add 6-8ml of absolute ethanol, deionized water and 2.5-3ml of hydrochloric acid to the mixed solution, stir quickly on a magnetic rotor stirrer to make it evenly mixed, and after 25-30min of reaction, the solution changes from turbid to clear and transparent solution ;

[0029] S4. Add an appropriate amount of 0.05mol / L dilute ammonia water to the S3 tran...

Embodiment 2

[0036] Embodiment 2: Based on Embodiment 1 but different;

[0037] according to Figure 1 It can be seen that the silane coupling agent KH550 is used as the amino modification to obtain the nano-silica composite material. At 20°C, the pH application range of the amino-modified nano-silica is wide, and the electrostatic interaction of the surface amino active sites promotes the methylene blue. Adsorption, the concentration of NaCl has a great influence on the adsorption of dyes, the temperature continues to rise, the adsorption capacity decreases, and some dyes are desorbed due to the increase of temperature, which reduces the adsorption capacity. The adsorption of methylene blue on modified nano-SiO2 conforms to the Langmuir adsorption model, the adsorption sites on the surface of the adsorbent are uniform, and the maximum adsorption capacity is 17.7mg·g －1 , for preferential adsorption.

Embodiment 3

[0038] Embodiment 3: based on embodiment 1 and 2 but different;

[0039] according to figure 2 , where spectral line 1 is the infrared spectrum curve of silica airgel before hydrophobic treatment, and spectral lines 2 and 3 are the infrared spectra of silica airgel after hydrophobic treatment with the weight ratio of 5% and 10% respectively . at 848.98cm -1 The peak appearing at represents Si-CH 3 , and the peak intensity increases with the increase of the amount of hydrophobic reagent added, which shows that the surface of the skeleton of silica airgel is connected with silyl groups after hydrophobic treatment, and by the Lambert-Beer law, the absorbance of the substance is related to the sample The concentration is directly proportional to the relationship, so it can be known that as the amount of hydrophobic reagent added increases, the more hydrophobic groups will be obtained in the material. at 1086.88cm -1 、798.44cm -1 and 460cm -1 , the peaks that appear represe...

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Abstract

The invention discloses the preparation of a modified nano-silica airgel, which belongs to the field of preparation of the modified silica airgel. Hydrophobic silica airgel was prepared by modifying nano silica with silane coupling agent KH550 as an amino group. The results showed that at 20°C, the pH application range of amino modified nano silica was wide, and the surface amino groups The electrostatic action of the active point promotes the adsorption of methylene blue. The concentration of NaCl has a great influence on the adsorption of dyes. As the temperature continues to rise, the adsorption capacity decreases. Some dyes are desorbed due to the increase in temperature, which reduces the adsorption capacity. The adsorption of methylene blue on modified nano-SiO2 conforms to the Langmuir adsorption model, the adsorption sites on the surface of the adsorbent are uniform, and the maximum adsorption capacity is 17.7mg·g －1 , for preferential adsorption.

Description

technical field [0001] The invention relates to the field of preparation of modified silica airgel, in particular to the preparation of modified nano silica airgel. Background technique [0002] Silica airgel is a new type of nanometer, porous, low-density amorphous material with a continuous three-dimensional network structure, and the typical network diameter is nanoscale (1}100nm is due to its unique nanostructure, two Silica airgel has many interesting properties. There are many light groups on the surface of silica airgel, which makes it easy to absorb water in water or humid air, resulting in cracking of the material, which limits the practical application of the material. At present, the research on hydrophobic silica is mainly to prepare bulk silica aerogels by hydrophobic treatment under supercritical conditions. We use hydrophobic modification methods at normal temperature and pressure to prepare low water absorption Hydrophobic silica airgel. Contents of the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/158C01B33/159
CPCC01B33/1585C01B33/159C01P2002/82
Inventor 张婷婷洪卉李媛陈健
Owner 无针科技集团河北有限公司
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