Preparation method of straw-based carbon airgel

A technology of carbon aerogel and aerogel, which is applied in the field of natural polymers, can solve the problems of weak strength and insufficient strength of carbon aerogel, and achieve the effect of increased portability and good stability

Active Publication Date: 2021-07-20
吴玉晓 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods for preparing cellulose-based carbon aerogels mostly use the method of preparing cellulose aerogels and then directly pyrolyzing them at high temperature in an inert atmosphere. The carbon aerogels prepared by this method have strong adsorption, but their strength Weaker, for example, when adsorbing oils and organic solvents, its adsorption capacity is 180-260 times its own weight. The greater the adsorption weight after adsorption, the higher the requirement for the binding strength of the molecules inside the carbon aerogel , while the internal strength of carbon aerogels prepared by direct high-temperature pyrolysis method is insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of straw-based carbon airgel, the specific steps are:

[0022] Step 1. Pretreatment of straw: Soak the straw in deionized water until it is neutral, then remove it, then cut the straw into about 3 cm, and then crush it into powder with a pulverizer;

[0023] Step 2. Extraction of cellulose: put the straw powder in step 1 in a reaction kettle, add a benzene / ethanol solution with a volume ratio of 2:1 as the extract, heat and stir at 90°C for 2 hours, filter, and extract the extract After discharge, add the extract to the straw powder to extract again, repeat 3 times, add water to dissolve the solid obtained by filtration, add glacial acetic acid to adjust the pH to 4, then add sodium chlorite to remove lignin, and add potassium hydroxide to adjust the pH to neutral, get straw cellulose;

[0024] Step 3. Preparation of amino nanospheres: Take 100 mL of ethanol solution of 5 g / L iron ferric oxide nanoparticles, ultrasonically disperse for 5 minutes,...

Embodiment 2

[0031] The preparation method of straw-based carbon airgel, the specific steps are:

[0032] Step 1. Pretreatment of straw: Soak the straw in deionized water until it is neutral, then remove it, then cut the straw into about 3 cm, and then crush it into powder with a pulverizer;

[0033] Step 2. Extraction of cellulose: put the straw powder in step 1 in the reaction kettle, add benzene / ethanol solution with a volume ratio of 2:1 as the extract, heat and stir at 90°C for 2.5h, filter, and extract After the liquid is discharged, add the extract to the straw powder again to extract, repeat 4 times, add water to dissolve the solid obtained by filtration, add glacial acetic acid to adjust the pH to 5, then add sodium chlorite to remove lignin, add potassium hydroxide to adjust PH to neutral, get straw cellulose;

[0034] Step 3. Preparation of amino nanospheres: Take 100 mL of ethanol solution of 5 g / L iron ferric oxide nanoparticles, ultrasonically disperse for 10 minutes, and th...

Embodiment 3

[0042] The preparation method of straw-based carbon airgel, the specific steps are:

[0043] Step 1. Pretreatment of straw: Soak the straw in deionized water until it is neutral, then remove it, then cut the straw into about 3 cm, and then crush it into powder with a pulverizer;

[0044] Step 2. Extraction of cellulose: put the straw powder in step 1 in the reaction kettle, add benzene / ethanol solution with a volume ratio of 2:1 as the extract, heat and stir at 90°C for 3 hours, filter, and extract the extract After discharge, add the extract to the straw powder to extract again, repeat 4 times, add water to dissolve the solid obtained by filtration, add glacial acetic acid to adjust the pH to 5, then add sodium chlorite to remove lignin, and add potassium hydroxide to adjust the pH to neutral, get straw cellulose;

[0045] Step 3. Preparation of amino nanospheres: Take 100 mL of ethanol solution of 5 g / L iron ferric oxide nanoparticles, ultrasonically disperse for 15 minutes...

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PUM

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Abstract

The invention provides a preparation method of straw-based charcoal aerogel. The straw is eluted and pretreated, cut and crushed, then extracted, and the straw cellulose is extracted, and then an amino-modified nanosphere solution is prepared. The obtained straw cellulose is dried in an oven, dissolved with a dissolving solution, frozen, and stirred vigorously after thawing at room temperature to prepare a straw cellulose aqueous solution; the amino-modified nanosphere solution is added to the straw cellulose aqueous solution to obtain a nanosphere / cellulose aqueous solution , frozen, and then eluted with 1% hydrochloric acid, deionized water, and tert-butanol solution to replace the ions in the carbon aerogel. In the invention, the strength of the straw-based carbon airgel is increased by adding an amino-modified nanosphere solution to the straw-based cellulose airgel, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the field of natural polymers, and in particular relates to a preparation method of straw-based carbon airgel. Background technique [0002] Straw is the general term for the stems and leaves (ears) of mature crops. It is a multi-purpose renewable biological resource. It is characterized by high crude fiber content, about 30%-40%, and contains lignin. The cellulose contained in it is the most common organic polymer in nature. It is a natural material with green environmental protection and excellent performance. Cellulose airgel is prepared from cellulose as a raw material. It has high void ratio and high specific surface area and also has good Biocompatibility, degradability and hydrophilicity. Carbon aerogels prepared from cellulose aerogels have the advantage of sustainable development. Carbon aerogels are a new type of lightweight nanoporous amorphous carbon materials. The prepared carbon aerogels have high porosity and I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
CPCB01J20/06B01J20/20B01J20/24B01J20/28047
Inventor 田龙
Owner 吴玉晓
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