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A kind of preparation method of bulk hybrid airgel

A hybrid gas and aerogel technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., to achieve low energy consumption, lower production costs, and easy industrialization

Inactive Publication Date: 2018-02-27
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cadmium is easy to accumulate in organisms. If the wastewater is not treated or discharged into the natural environment if the treatment is not up to standard, it will inevitably cause serious consequences to the natural environment and human health.

Method used

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  • A kind of preparation method of bulk hybrid airgel
  • A kind of preparation method of bulk hybrid airgel
  • A kind of preparation method of bulk hybrid airgel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of bulk hybrid airgel

[0034] (1) Measure 4.5mL tetraethyl orthosilicate, 2mL deionized water, 8mL acetonitrile in a beaker,

[0035] 0.4mL (0.008mol / L) oxalic acid, stir evenly and place in a water bath at 50°C for 10min. Take out the beaker and wait until it returns to room temperature, pipette 1mL of 3-aminopropyltriethoxysilane into the beaker, and add it dropwise while stirring. After a few minutes, it will gel, add 20mL of acetonitrile, and age for 2 hours.

[0036] (2) Soak the aged gel in 30 mL of acetonitrile solution with a mass fraction of 5% diisocyanate, and place it in a water bath at 40°C for 36 hours.

[0037] (3) Take out the cross-linked gel, add 20mL of acetonitrile, let it stand at room temperature for 24h, seal it with a plastic wrap with pinholes, and dry it in an oven at 60°C for 36h to obtain silica block airgel .

[0038] figure 1 It is a massive hybrid airgel prepared under normal pressure. As can be seen in the fig...

Embodiment 2

[0042] (1) Measure 4.5mL tetraethyl orthosilicate, 2mL deionized water, 8mL acetonitrile in a beaker,

[0043] 0.4mL (0.008mol / L) oxalic acid, stir evenly and place in a water bath at 30°C for 15min. Take out the beaker and wait for it to return to room temperature, pipette 0.8 mL of 3-aminopropyltriethoxysilane into the beaker with a pipette gun, and add it dropwise while stirring. After a few minutes, it will gel, add 30mL of acetonitrile, and age for 3 hours.

[0044] (2) Soak the aged gel in 20 mL of acetonitrile solution with a mass fraction of 5% diisocyanate, and place it in a water bath at 30°C for 28 hours.

[0045](3) Take out the cross-linked gel, add 30mL of acetonitrile, let it stand at room temperature for 18h, seal it with a plastic wrap with pinholes, and dry it in an oven at 50°C for 48h to obtain silica block airgel .

Embodiment 3

[0047] (1) Measure 4.5mL tetraethyl orthosilicate, 2mL deionized water, 8mL acetonitrile in a beaker,

[0048] 0.4mL (0.008mol / L) oxalic acid, stir evenly and place in a water bath at 60°C for 8 minutes. Take out the beaker and wait for it to return to room temperature, pipette 1.2mL of 3-aminopropyltriethoxysilane into the beaker with a pipette gun, and add it dropwise while stirring. After a few minutes, it will gel, add 40mL of acetonitrile, and age for 5 hours.

[0049] (2) Soak the aged gel in 40 mL of acetonitrile solution with a mass fraction of 5% diisocyanate, and place it in a water bath at 60°C for 24 hours.

[0050] (3) Take out the cross-linked gel, add 40mL of acetonitrile, let it stand at room temperature for 12h, seal it with a plastic wrap with pinholes, and dry it in an oven at 100°C for 30h to obtain silica block airgel .

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Abstract

The invention belongs to the technical field of new material preparation and relates to a preparation method of blocky hybrid aerogel which specifically refers to blocky aerogel fast prepared under the normal pressure condition and has an efficient removing effect on Cd2+ in waste water. The preparation method includes the steps that firstly, tetraethyl orthosilicate, deionized water, acetonitrile and an oxalic acid solution are measured and taken and are mixed, and the mixture is placed in a water bath kettle to react; after reaction, a beaker is taken out, 3-aminopropyltriethoxysilane is transferred into the beaker through a pipette when temperature returns to room temperature, and acetonitrile is added for aging after gelation; then gel is soaked in an acetonitrile solution containing isophorone diisocyanate and is placed in the water bath kettle for crosslinking; finally, acetonitrile is added, after standing performed under room temperature, the gel is sealed through a preservative film with needle holes and placed in a normal-pressure drying oven to be dried, and the silicon dioxide blocky hybrid aerogel is obtained. In the preparation process of the blocky hybrid aerogel, no solvent exchange or surface modification exists, consumed time is short, consumed energy is little, operation is easy, and the blocky hybrid aerogel has an efficient adsorbing effect on Cd2+ in waste water.

Description

technical field [0001] The invention belongs to the technical field of preparation of new materials, and relates to a method for preparing a block hybrid airgel, in particular to a block airgel rapidly prepared under normal pressure conditions, and for reducing Cd in waste water. 2+ Has an efficient removal effect. Background technique [0002] Silica airgel is a low-density nanoporous amorphous material with a continuous random network structure. The unique properties of silica airgel include ultra-high specific surface area (﹥1000 m 2 / g), low refractive index (﹤1.1), low electrical conductivity (﹤1.7), low thermal conductivity (~0.017 W / m K), low sound transmission coefficient (﹤100 m / s) and low density (﹤100 kg / m 3 )Features. These characteristics make it possible to be made into a variety of high-performance materials such as acoustic impedance coupling materials, filter materials, and high-temperature heat insulation materials. Glare coatings, low dielectric const...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/103B01J20/28047C02F1/281C02F2101/20
Inventor 汪强朱建军冯金马丽蓉谢吉民魏巍
Owner JIANGSU UNIV
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