A kind of castor oil/cellulose composite airgel and its preparation method and application

A composite aerogel and cellulose technology, applied in aerogel preparation, separation methods, chemical instruments and methods, etc., to achieve the effects of abundant reserves, high hydrophobicity, and high oil-water selectivity

Active Publication Date: 2022-03-04
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problem to be solved: Aiming at the problems existing in the existing cellulose airgel materials, the present invention provides a castor oil / cellulose composite airgel with tannic acid as the intermediary layer and castor oil as the hydrophobic modifier and Its preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of castor oil / cellulose composite airgel, comprising the steps of: dispersing 1g of cellulose nanofibers in 100mL ultrapure water, and adding NaOH to adjust the pH of the solution to 8.5, magnetically stirring for 3h to form uniform fibers (2) Add 50 mg of tannic acid to the aqueous dispersion of cellulose nanofibers and stir for 30 min, then dissolve 0.4 g of silanized castor oil in 5 mL of absolute ethanol to form an ethanol solution and add it to the cellulose Continue stirring for 6 hours in the nanofiber aqueous dispersion to obtain a mixed solution; pour the mixed solution into a mold, and freeze-dry at -72° C. and 1 Pa for 72 hours to obtain a castor oil / cellulose composite airgel. The airgel has super lipophilic properties, the oil contact angle is 0°, and the water contact angle is 56°.

Embodiment 2

[0018] A preparation method of castor oil / cellulose composite airgel, comprising the steps of: dispersing 1g of cellulose nanofibers in 200mL ultrapure water, and adding NaOH to adjust the pH of the solution to 8.5, magnetically stirring for 3h to form uniform fibers (2) Add 50 mg of tannic acid to the aqueous dispersion of cellulose nanofibers and stir for 30 min, then dissolve 0.8 g of silanized castor oil in 5 mL of absolute ethanol to form an ethanol solution and add it to the cellulose Continue stirring for 6 hours in the nanofiber aqueous dispersion to obtain a mixed solution; pour the mixed solution into a mold, and freeze-dry at -72° C. and 1 Pa for 72 hours to obtain a castor oil / cellulose composite airgel. The airgel has super lipophilic properties, the oil contact angle is 0°, and the water contact angle is 107°.

Embodiment 3

[0020] A preparation method of castor oil / cellulose composite airgel, comprising the steps of: dispersing 1g of cellulose nanofibers in 200mL ultrapure water, and adding NaOH to adjust the pH of the solution to 8.5, magnetically stirring for 3h to form uniform fibers (2) Add 50 mg of tannic acid to the aqueous dispersion of cellulose nanofibers and stir for 30 min, then dissolve 1.2 g of silanized castor oil in 5 mL of absolute ethanol to form an ethanol solution and add it to the cellulose Continue stirring for 6 hours in the nanofiber aqueous dispersion to obtain a mixed solution; pour the mixed solution into a mold, and freeze-dry at -72° C. and 1 Pa for 72 hours to obtain a castor oil / cellulose composite airgel. The airgel has super lipophilic properties, the oil contact angle is 0°, and the water contact angle is 125°.

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Abstract

A castor oil / cellulose composite airgel and its preparation method and application, preparing cellulose nanofiber aqueous dispersion, and adjusting the pH value to 8-9, then adding tannic acid and silanized castor oil, and freeze-drying Finally, the castor oil / cellulose composite airgel was prepared. The raw materials of the airgel prepared by the method are all derived from biomass, and have the characteristics of high hydrophobicity and superoleophilicity, can be used in the field of oil-water separation, and will not pollute the environment.

Description

technical field [0001] The invention belongs to the field of high-value utilization of biomass, in particular to a biomass composite airgel, in particular to a castor oil / cellulose composite airgel and its preparation method and application. Background technique [0002] Oil pollution has brought great harm to the water environment, thereby affecting human health and the ecological environment. It is urgent to research and develop technologies and materials that can effectively remove oil pollutants. At present, the commonly used degreasing methods include combustion, microbial degradation, adsorption and other methods, among which the adsorption method has attracted extensive attention of researchers because of its low cost, high efficiency and easy recycling. Traditional oil-absorbing materials have disadvantages such as low oil absorption capacity, non-biodegradable materials, and easy to cause secondary pollution to the environment. Therefore, the development of light-we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08L1/02C08L91/00C08K5/1545B01J13/00B01D17/022
CPCC08J9/286C08J9/0023C08J9/0061B01J13/0091B01D17/0202C08J2301/02C08J2391/00C08J2401/02C08J2491/00C08K5/1545C08J2205/026C08J2207/04
Inventor 尚倩倩周永红刘承果杨晓慧胡立红薄采颖胡云潘政
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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