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A kind of preparation method of amino modified cellulose airgel

A technology of cellulose aerogel and cellulose gel, which is applied in separation method, chemical instrument and method, gas treatment and other directions, can solve the problems of complicated process and unsuitable titration process, and achieves the effect of simple preparation method

Active Publication Date: 2022-02-22
NANJING TECH UNIV
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  • Abstract
  • Description
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Problems solved by technology

The literature (Journal of Southwest Forestry University, 2018,38(3):181-187) also reported a method of amino-modified cellulose airgel, which uses pulp as raw material to prepare cellulose, and the cellulose is formulated into cellulose After the sol is titrated to obtain hydrogel, the method is complicated and the titration process is not suitable for large-scale production

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  • A kind of preparation method of amino modified cellulose airgel

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example 1

[0021] Dissolve 2g of cellulose in sodium hydroxide / urea / water solvent system at -20°C to obtain a clear and transparent cellulose solution. Sodium hydroxide: urea: water mass ratio is 1:1.5:10. The mold is placed in a container equipped with a water coagulation bath at 25°C. The coagulation bath volatilizes and diffuses into the cellulose solution to cause a phase inversion gel of the cellulose solution. The gel is washed with 1% acetic acid aqueous solution and then soaked in carbon dioxide. In the solution of 3-aminopropyltrimethoxysilane at 0 ℃, carry out amino modification until the pH of the solution is stable, the volume concentration of carbon dioxide gas for treatment is 100%, the gas flow rate is 0.1 / min, and the treatment time is 30min. The amino-modified cellulose airgel was obtained by water replacement and freeze-drying. The carbon dioxide adsorption capacity of the amino-modified cellulose airgel was 2.9 mmol / g, and the formaldehyde adsorption capacity was 3.2 mm...

example 2

[0023] Dissolve 6g of cellulose in sodium hydroxide / urea / water solvent system at -15°C to obtain a clear and transparent cellulose solution, sodium hydroxide: urea: water mass ratio is 1:2:11, the cellulose solution will be housed The mold is placed in a container equipped with an ethanol coagulation bath at 25°C. The coagulation bath volatilizes and diffuses into the cellulose solution to cause a phase inversion gel of the cellulose solution. The gel is washed with 5% acetic acid aqueous solution and then soaked in carbon dioxide. In the solution of 3-aminopropyltriethoxysilane at 20°C, carry out amino modification until the pH of the solution is stable, the volume concentration of carbon dioxide gas for treatment is 50%, the gas flow rate is 0.5L / min, and the treatment time is 10min. Then, the amino-modified cellulose airgel was obtained through ethanol replacement and supercritical drying. The carbon dioxide adsorption capacity of the amino-modified cellulose airgel was 2.5 ...

example 3

[0025] Dissolve 8g of cellulose in sodium hydroxide / urea / water solvent system at -10°C to obtain a clear and transparent cellulose solution, sodium hydroxide: urea: water mass ratio is 1:2.5:13, the cellulose solution will be housed The mold is placed in a container equipped with a water coagulation bath at 45°C. The coagulation bath volatilizes and diffuses into the cellulose solution to cause a phase inversion gel of the cellulose solution. The gel is washed with an 8% acetic acid aqueous solution and then soaked in carbon dioxide. Amino modification was carried out in the solution of polyethyleneimine at 40°C until the pH of the solution was stable, the volume concentration of carbon dioxide gas used for treatment was 70%, the gas flow rate was 1L / min, and the treatment time was 45min, and then replaced by ethanol and supercritical The amino-modified cellulose airgel was obtained by drying, the carbon dioxide adsorption capacity of the amino-modified cellulose airgel was 2.0...

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Abstract

The invention relates to a preparation method of amino modified cellulose airgel. In this method, cellulose is dissolved in a sodium hydroxide-urea-water solvent system to obtain a clear and transparent cellulose solution, and then a cellulose gel is formed by a phase inversion method, and the gel is washed with an aqueous acetic acid solution and soaked in an amino modifier Amino modification is carried out, and then the amino modified cellulose airgel is obtained through solvent replacement and drying. The preparation method of the amino-modified cellulose airgel provided by the present invention is simple, suitable for large-scale production, and can be used for efficient and selective adsorption of gases such as formaldehyde and carbon dioxide. mmol / g.

Description

technical field [0001] The invention belongs to the field of preparation of new materials, and relates to a preparation method of amino-modified cellulose airgel. Background technique [0002] Cellulose airgel has the characteristics of ultra-low density, high specific surface area, and large porosity. In order to meet the different needs of applications, the functional modification of cellulose aerogels has attracted widespread attention of researchers, especially amino-modified cellulose aerogels, which can be used in many fields such as carbon dioxide and metal ion adsorption. Patent CN106750384A provides a method for modifying cellulose aerogel by gas phase method. This method first prepares cellulose aerogel, and then modifies it in gaseous aminosilane. The modification process has many steps and requires special equipment, which is not suitable for large-scale industrial production. The literature (Journal of Southwest Forestry University, 2018,38(3):181-187) also re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J3/075C08J7/12B01J20/24B01J20/28B01J20/30B01D53/02C08L1/02
CPCC08J9/28C08J3/075C08J7/12B01J20/24B01J20/28047B01D53/02B01D2257/70B01D2257/504C08J2301/02Y02C20/40Y02P20/50Y02P20/151
Inventor 孔勇张嘉月沈晓冬
Owner NANJING TECH UNIV