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Cellulose aerogel and preparation method and application thereof

A cellulose airgel and cellulose technology, applied in the fields of medicine and environmental protection, can solve the problems of limited application and achieve good hydrophobic performance

Inactive Publication Date: 2018-12-25
范佳晨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cellulose airgel can have good hydrophobicity after modification, but in the existing technical means, its surface contact angle can only reach about 150°, which limits its application in oil-water separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The pH of chitosan solution was adjusted to 9, then xylanase was added to treat for 30min; in the microwave with output power of 500w, it was treated for 15min, and the speed of 8000rpm was stirred for 60min; the mass fraction was added to be 0.05% cellulase for 30min, Obtain a microfiber slurry; add 50 mg of carboxymethyl cellulose per gram of the microfiber slurry, adjust the pH to 8, stir and mix for 20 minutes, and perform fluidization treatment in a fluidizer to obtain microfibrillated cellulose.

[0018] The microfibrillated cellulose and vinyltrimethoxysilane were mixed according to 5:2, the pH was adjusted to 4, and stirred for 30 minutes; then freeze-dried to obtain cellulose airgel.

[0019] The prepared cellulose airgel has a density of 13 mg / cm 3 ; The porosity is 99.7%, and the contact angle of water droplets on the surface is 165°.

Embodiment 2

[0021] The pH of chitosan solution was adjusted to 9, then xylanase was added to treat for 30min; the microwave output power was 500w for 15min, and the speed of 8000rpm was stirred for 60min; the mass fraction was added to be 0.08% cellulase for 30min, Obtain a microfiber slurry; add 70 mg of carboxymethyl cellulose per gram of the microfiber slurry, adjust the pH to 8, stir and mix for 20 minutes, and perform fluidization treatment in a fluidizer to obtain microfibrillated cellulose.

[0022] The microfibrillated cellulose and vinyltrimethoxysilane were mixed according to 5:3, the pH was adjusted to 4, and stirred for 30 minutes; then freeze-dried to obtain cellulose airgel.

[0023] The prepared cellulose airgel has a density of 12.6mg / cm 3 ; The porosity is 99.4%, and the contact angle of water droplets on the surface is 158°.

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Abstract

The invention discloses cellulose aerogel and a preparation method and application thereof. The method includes the steps of firstly, regulating pH of a chitosan solution to 9-10, and adding xylanasefor processing for 20-30 minutes; processing in microwaves for 10-30 minutes, and stirring for 60-120 minutes; adding cellulase for processing for 20-60 minutes to obtain microfiber slurry; adding carboxymethyl cellulose into the microfiber slurry, regulating pH to 6-8, stirring and mixing for 20-60 minutes, and fluidizing in a fluidizer to obtain microfibrillated cellulose; secondly, mixing the microfibrillated cellulose and vinyl trimethoxy silane, regulating pH to 4-5, and stirring for 20-60 minutes; performing freeze drying to obtain the cellulose aerogel. The cellulose aerogel has the advantages that the cellulose aerogel is subjected to silylation modification to allow the surface of the cellulose aerogel to have good hydrophobic property, the contact angle of surface water drops canreach 165 degrees, and the cellulose aerogel can be used for adsorbing oiling agents, oil and the like to perform oil-water separation.

Description

technical field [0001] The application belongs to the technical fields of medicine and environmental protection, and in particular relates to a preparation method of cellulose airgel and its application. Background technique [0002] Cellulose airgel can have good hydrophobicity after modification, but in the prior art, its surface contact angle can only reach about 150°, which limits its application in oil-water separation. Contents of the invention [0003] The object of the present invention is to provide a kind of preparation method of cellulose airgel and application thereof, to overcome the deficiencies in the prior art. [0004] To achieve the above object, the present invention provides the following technical solutions: [0005] The embodiment of the present application discloses a preparation method of cellulose airgel, comprising: [0006] (1), adjust the pH of the chitosan solution to 9-10, then add xylanase for 20-30min; treat in microwave for 10-30min, then...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08B15/00C08L1/04C12P19/14C12P19/04B01J20/22B01J20/24B01J20/28C02F1/28C02F1/40B01D17/02B01J13/00
CPCB01D17/0202B01J13/0091B01J20/22B01J20/24B01J20/28047B01J2220/4806B01J2220/4825C02F1/285C02F1/286C02F1/40C08B15/00C08J9/28C08J2301/04C12P19/04C12P19/14
Inventor 范佳晨
Owner 范佳晨