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Modified chitosan/nanocellulose composite aerogel and preparation method and application thereof

A technology of nano-cellulose and composite airgel, which is applied in chemical instruments and methods, alkali metal compounds, and other chemical processes, can solve the problem of low removal rate of heavy metal ions, and achieve sustainable development of the environment and biocompatibility Good performance and simple preparation process

Inactive Publication Date: 2016-12-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the disadvantages of chitosan being easy to swell and soluble in dilute acid, resulting in a low removal rate of heavy metal ions, it is necessary to physically or chemically modify chitosan to overcome its shortcomings.

Method used

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  • Modified chitosan/nanocellulose composite aerogel and preparation method and application thereof
  • Modified chitosan/nanocellulose composite aerogel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of sulfur-containing modified chitosan airgel, comprising the following steps:

[0031] (1) take by weighing 10.0g chitosan in the glacial acetic acid solution of 2% in 500mL mass fraction, the chitosan solution is carried out suction filtration, then wash with dehydrated alcohol, obtain the chitosan after the pretreatment; In 500mL In the round bottom flask, respectively add 5 g of the above-mentioned pretreated chitosan and 30 mL of hydrochloric acid solution with a mass fraction of 6%, and control the reaction temperature at 0° C. Dimethyl dipropionate 25g; after the dropwise addition, remove the ice-water bath, and continue to react at room temperature for 10 hours to obtain a light yellow viscous substance; after standing, precipitate, and suction filter to obtain a milky white solid, dry it with absolute ethanol to re- Crystallization obtains sulfur-containing modified chitosan;

[0032] (2) getting the modified chitosan 3g that step (1) make...

Embodiment 2

[0035] A preparation method of sulfur-containing modified chitosan airgel, comprising the following steps:

[0036](1) taking by weighing 8.0g chitosan and being dissolved in 400mL mass fraction is in the glacial acetic acid solution of 3%, the chitosan solution is carried out suction filtration, then washes with dehydrated alcohol, obtains the chitosan after pretreatment; In a 500mL round-bottomed flask, add 5g of the above-mentioned pretreated chitosan and 28mL of hydrochloric acid solution with a mass fraction of 5%, control the reaction temperature at 1°C, and add disulfide disulfide dropwise at a rate of 2mL / min under stirring. Substituting dimethyl dipropionate 20g; after the dropwise addition, remove the ice-water bath, and continue to react at room temperature for 9h to obtain a light yellow viscous substance; after standing, precipitate, and suction filter to obtain a milky white solid, dry it with absolute ethanol Recrystallization obtains sulfur-containing modified ...

Embodiment 3

[0039] A preparation method of sulfur-containing modified chitosan airgel, comprising the following steps:

[0040] (1) taking by weighing 10.0g chitosan and being dissolved in 500mL mass fraction is in the glacial acetic acid solution of 1%, the chitosan solution is carried out suction filtration, then washes with dehydrated alcohol, obtains the chitosan after pretreatment; In a 500mL round-bottomed flask, add 5g of the pretreated chitosan and 24mL of 4% hydrochloric acid solution respectively, control the reaction temperature at 3°C, and add disulfide disulfide dropwise at a rate of 3mL / min under stirring. Substituting dimethyl dipropionate 15g; After the dropwise addition, remove the ice-water bath, and continue to react at room temperature for 8h to obtain a light yellow viscous substance; after standing, precipitate, and suction filter to obtain a milky white solid, dry it with absolute ethanol Recrystallization obtains sulfur-containing modified chitosan;

[0041] (2) g...

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Abstract

The invention belongs to the technical field of high polymer materials and specifically discloses modified chitosan / nanocellulose composite aerogel and a preparation method and application thereof. The preparation method comprises the following steps: letting pretreated chitosan react with a hydrochloric acid solution, adding dithiobispropionate, and reacting to prepare modified chitosan; dissolving modified chitosan with an acetic acid solution, adding nanocellulose and fully reacting; adding potassium peroxodisulfate and uniformly mixing; adding acrylic acid and NaOH solution and fully dissolving; adding a N,N'-methylene bisacrylamide solution to prepare modified chitosan / nanocellulose composite aerogel, and freeze-drying to obtain the aerogel product. The prepared modified chitosan / nanocellulose composite aerogel has efficiency and enhanced adsorptive property, and has a remarkable effect of adsorbing heavy metal Cu<2+> with low concentration. Meanwhile, the preparation technology is simple and has strong operability.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a modified chitosan / nanocellulose composite airgel and a preparation method and application thereof. Background technique [0002] Chitosan, as the second largest natural polymer material except cellulose, is the only biorenewable alkaline polysaccharide polymer. Chitosan obtained by deacetylation of chitin has rich sources, With good biocompatibility, biodegradability and antibacterial properties, it is widely favored in the fields of chemical industry, food, textile and environmental protection, so it is of great significance to the further development and application of chitosan materials. Chitosan has a large number of active amino groups and hydroxyl groups, and has broad application prospects in the treatment of heavy metal-containing wastewater. However, because chitosan has the disadvantages of easy swelling and soluble in dilute acid, etc., resulti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F251/02C08F220/06C08F222/38C08B37/08B01J20/24B01J20/28C02F1/28C02F101/20
CPCB01J20/24C02F1/286C08B37/003C08F251/00C08F251/02B01J20/28047C02F2101/20C08F220/06
Inventor 杨仁党朱雪换
Owner SOUTH CHINA UNIV OF TECH
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