Silicon oxide-chitosan composite aerogel and preparation method thereof

A composite aerogel and composite gel technology, applied in the field of silica-chitosan composite aerogel and its preparation, to achieve the effect of low price, simple steps and abundant sources

Active Publication Date: 2014-12-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to overcome the defects of existing chitosan airgel properties and preparation methods, and the invention provides a silica-chitosan composite airgel and a preparation method thereof

Method used

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  • Silicon oxide-chitosan composite aerogel and preparation method thereof
  • Silicon oxide-chitosan composite aerogel and preparation method thereof
  • Silicon oxide-chitosan composite aerogel and preparation method thereof

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preparation example Construction

[0032] The invention relates to a silicon oxide-chitosan composite airgel and a preparation method thereof. The silica-chitosan composite airgel prepared by the present invention has a three-dimensional porous network structure, and the BET specific surface area is 300-1000m 2 / g, the tap density is 0.1-1.0g / cm 3 , and its components are as follows: the mass fraction of chitosan is 9%-65%, the mass fraction of chitosan cross-linking agent is 1%-5%, and the mass fraction of silicon oxide is 30%-90%.

[0033] The method of the present invention comprises the following steps: (1) prepare silica-chitosan composite sol; (2) prepare silica-chitosan gel; (3) polar organic compound of silica-chitosan gel Solvent replacement; (4) non-polar solvent replacement and surface chemical modification of silica-chitosan gel; (5) normal pressure drying of silica-chitosan gel and silica-chitosan composite gas Obtaining the gel. The composite airgel prepared by the invention has good acid and a...

Embodiment 1

[0052] 1) Select 10 milliliters of industrial water glass with a modulus of 3.0, mix it with 40 milliliters of deionized water, and stir evenly to obtain a diluted water glass solution (A). Mix strong acidic ion exchange resin with a volume ratio of 1:1 and dilute water glass, stir for 10 minutes, and filter to obtain the clear liquid, that is, the silicic acid solution (B) with a pH value of 2-3. Dissolve 0.5 g of chitosan powder in 50 ml of 0.1 mol / L acetic acid solution to prepare chitosan solution (C). Pour 50 milliliters of silicic acid solution (B) into 50 milliliters of chitosan solution (C), and stir for 20 min to obtain a mixed solution (D) of chitosan and silicic acid solution;

[0053] 2) Use ammonia water to adjust the pH value of the mixed solution (D) to about 6, add 100 microliters of glutaraldehyde with a mass concentration of 25%, stir for 20 minutes, and react at 60°C for 1 hour to obtain silica-chitosan composite water Gel (E);

[0054] 3) The silica-chito...

Embodiment 2

[0060] 1) Select 10 milliliters of industrial water glass with a modulus of 3.0, mix it with 40 milliliters of deionized water, and stir evenly to obtain a diluted water glass solution (A). Mix strong acidic ion exchange resin with a volume ratio of 1:1 and dilute water glass, stir for 10 minutes, and filter to obtain the clear liquid, that is, the silicic acid solution (B) with a pH value of 2-3. Dissolve 1 g of chitosan powder in 50 milliliters of 0.1 mol / L acetic acid solution to prepare chitosan solution (C). Pour 50 milliliters of silicic acid solution (B) into 50 milliliters of chitosan solution (C), and stir for 20 min to obtain a mixed solution (D) of chitosan and silicic acid solution;

[0061] 2) Use hexamethylenetetramine to adjust the pH value of the mixed solution (D) to about 6, add 200 microliters of glutaraldehyde with a mass concentration of 25%, stir for 20 minutes, and react at 60° C. for 1 hour to obtain silicon oxide- Chitosan composite hydrogel (E);

[...

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Abstract

The invention relates to a silicon oxide-chitosan composite aerogel and a preparation method thereof. The silicon oxide-chitosan composite aerogel comprises chitosan, a chitosan cross-linking agent and silicon oxide, wherein the mass fraction of the chitosan is 9%-65%, the mass fraction of the silicon oxide is 30%-90%, and the mass fraction of the chitosan cross-linking agent is 1%-5%.

Description

technical field [0001] The invention belongs to the field of composite new materials, and in particular relates to a silica-chitosan composite airgel and a preparation method thereof. The prepared composite airgel has good acid and alkali resistance, high specific surface area, and can be grafted with different functional groups as required , used in medicine, water treatment, chemical industry and other fields. Background technique [0002] Chitosan is derived from the natural polymer chitin, which is rich in nature, contains active functional groups such as amino and hydroxyl groups in the molecule, and has good biocompatibility and microbial degradability. It is widely used in medicine, food, chemical industry, cosmetics, Water treatment, metal extraction and recovery have important application prospects. [0003] In aqueous solution, the amino groups of chitosan molecules are easily ionized. When the pH value is lower than 5, chitosan will dissolve, which greatly limits...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K3/36C08K5/07C08J9/28
Inventor 黄宇迪高相东顾正莹李效民张树德丁绪坤虎学梅
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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