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Methyl modified composite silicon dioxide aerogel with multi-stage pore structure and preparation method and application of methyl modified composite silicon dioxide aerogel

A technology of composite silica and methyltriethoxysilane is applied in the fields of silica aerogel preparation, hydrophobic silica aerogel preparation and organic matter adsorption, which can solve the problem of low degree of crosslinking and weak skeleton strength. , It is difficult to obtain aerogels with stable structures, etc., to achieve the effects of high hydrophobicity, solving structural damage and good adsorption effect

Inactive Publication Date: 2019-10-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it is directly used as a silicon source to prepare silica airgel, there are defects such as weak skeleton strength and low degree of crosslinking, and it is difficult to obtain airgel with a stable structure.

Method used

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  • Methyl modified composite silicon dioxide aerogel with multi-stage pore structure and preparation method and application of methyl modified composite silicon dioxide aerogel
  • Methyl modified composite silicon dioxide aerogel with multi-stage pore structure and preparation method and application of methyl modified composite silicon dioxide aerogel
  • Methyl modified composite silicon dioxide aerogel with multi-stage pore structure and preparation method and application of methyl modified composite silicon dioxide aerogel

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Effect test

Embodiment 1

[0033] (1) Preparation of a methyl-modified hydrophobic silica airgel with a hierarchical porous structure

[0034] The siloxane solution is prepared with tetraethyl orthosilicate and methyltriethoxysilane as a mixed silicon source, and acetic acid as an acid catalyst. Mix the two evenly according to mol TEOS:mol MTES=1:1, according to mol Si:mol H 2 O:mol CH 3 COOH:mol C 2 h 5 OH=1:4:2:7 Add deionized water, acetic acid and ethanol dropwise, and stir thoroughly for 6 hours to obtain a clear transparent sol. Ammonia water was added dropwise to the above clear solution to make the solution pH=9, and then the sol solution was stirred for 0.5 h. The sol was transferred to a mold and allowed to stand at 25° C. for 8 hours to obtain a wet gel. Put the wet gel at 45°C for aging treatment for 10 hours, and finally soak the wet gel in ethanol for 4 times, each soaking time is 6h. Put the aged wet gel into the autoclave, add ethanol as the reaction medium, raise the temperature t...

Embodiment 2

[0038] Referring to Example 1, the difference from Example 1 is that the two are uniformly mixed according to mol TEOS:mol MTES=1:2, and according to mol Si:mol H 2 O:mol CH 3 COOH:mol C 2 h 5 OH=1:4:0.5:7 Add deionized water, acetic acid and ethanol dropwise respectively, stir thoroughly for 6 hours to obtain a clear transparent sol, add ammonia water dropwise to the above clear solution to make the solution pH=10. The methyl-modified silica airgel prepared by this method has a higher proportion of 2nm pore structure, and the sample has a good adsorption effect on organic matter, and its adsorption capacities for ethanol, DMF, benzene and methylene chloride are respectively 13.9 g / g, 15.6 g / g, 16.9 g / g and 20.7 g / g.

Embodiment 3

[0040] Referring to Example 1, the difference from Example 1 is that the two are uniformly mixed according to mol TEOS:mol MTES=1:0.5, and according to mol Si:mol H 2 O:mol CH 3 COOH:mol C 2 h 5 OH=1:4:1:7 Add deionized water, acetic acid and ethanol dropwise, respectively. The methyl-modified silica airgel prepared by this method has a higher proportion of 18nm pore structure, and its hydrophobic angle can reach 142°. The adsorption capacities of dichloromethane are 14.2g / g, 15.8g / g, 16.2g / g and 21.4g / g, respectively.

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Abstract

The invention discloses methyl modified composite silicon dioxide aerogel with a multi-stage pore structure and a preparation method and application of the methyl modified composite silicon dioxide aerogel. Methyl triethoxysilane is added into traditional tetraethyl orthosilicate, thus methyl triethoxysilane and tetraethyl orthosilicate jointly serve as a mixed silicon source, and the composite silicon dioxide aerogel is obtained through a two-step hydrolysis method. The composite aerogel has the characteristics of high hydrophobicity, high specific surface area and high pore volume, and a composite is provided with 2 nm pores and 18 nm mesopores which jointly constitute the multi-stage pore structure of the composite. The aerogel has the excellent adsorption characteristic and the higheradsorption capacity, has a good adsorption effect on various organic matter, and has important theoretical significance and application value for development of high-performance adsorbent materials.

Description

technical field [0001] The invention belongs to the field of silica airgel preparation, more specifically, relates to the preparation and application of a hydrophobic silica airgel with a hierarchical porous structure, and belongs to the preparation of hydrophobic silica airgel and the adsorption of organic matter field. Background technique [0002] In recent years, with the rapid growth of global population and the continuous development of social economy, the problem of environmental pollution has become more and more serious. Among them, the problem of water environmental pollution is particularly prominent. A large number of industrial and domestic sewage discharge problems seriously affect the water environment and cause great harm to human health. Among the many pollutant treatment methods, the physical adsorption method has the characteristics of low cost, simple operation and little impact on the environment. [0003] Airgel is a three-dimensional network porous m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/103B01J20/22B01J20/28011B01J20/28047B01J20/28054C02F1/288C02F2101/30
Inventor 苏冬张峰瑞桑志远刘越
Owner TIANJIN UNIV
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