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Preparation method of chitin aerogel

A chitin and aerogel technology, which is applied in the field of chitin aerogel preparation, can solve the problems of difficulty in separation, purification and recovery, and high production costs, and achieves the advantages of environmental protection and operator health, low cost, and easy operation. Simple and convenient effects

Active Publication Date: 2012-04-18
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NMMO and ionic liquids can also dissolve chitin under heating conditions (Green Chemistry, 2006, 8, 630-633.), but they are sensitive to water and oxidized impurities, and have high production costs, difficulties in separation, purification and recovery, etc. question

Method used

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  • Preparation method of chitin aerogel
  • Preparation method of chitin aerogel
  • Preparation method of chitin aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The commercially available chitin was soaked in 5wt% dilute HCl at room temperature for 12 hours, filtered and washed with water, soaked in 4wt% NaOH aqueous solution for 12 hours, and then dried to obtain chitin powder with an acetylation degree of 92%. Pre-cool the mixed solvent of 11g NaOH, 4g urea and 85g water to -12°C, add 6g chitin powder and stir evenly, then keep it at -20°C for 12h. Thaw at room temperature to obtain a transparent chitin solution. A 1mm thick chitin solution was obtained by casting on a glass plate, immersed in 5wt% H 2 SO 4 Put it in the aqueous solution for 10 minutes to make it gel, wash it with water and replace it with absolute ethanol, and pass through supercritical CO 2 Drying (temperature 40°C, pressure 100kg / cm 2 ) to prepare chitin aerogels. The specific surface area of ​​chitin airgel is 376m2 through nitrogen adsorption-desorption test 2 / g, porosity 89%, density 0.24g / cm 3 .

Embodiment 2

[0037] After the chitin hydrogel in Example 1 was replaced with tert-butanol, the chitin aerogel was obtained through freeze-drying, and the other steps were the same. The specific surface area of ​​chitin aerogel is 336m through nitrogen adsorption-desorption test 2 / g, porosity 87%, density 0.22g / cm 3 .

Embodiment 3

[0043] The commercially available chitin was soaked in 5wt% dilute HCl at room temperature for 12 hours, filtered and washed with water, soaked in 4wt% NaOH aqueous solution for 12 hours, and then dried to obtain chitin powder with an acetylation degree of 92%. Pre-cool the mixed solvent of 2g NaOH, 20g urea and 78g water to -12°C, add 0.5g chitin powder and stir evenly, then keep it at -20°C for 12h. Thaw at room temperature to obtain a transparent chitin solution. A chitin solution with a thickness of 1mm was obtained by casting on a glass plate. The chitin solution was immersed in a 5wt% HCl aqueous solution for 10 minutes to make it gel, washed with water and then replaced with anhydrous methanol. 2 Drying (temperature 40°C, pressure 100kg / cm 2 ) to prepare chitin aerogels. The specific surface area of ​​chitin aerogel is 375m through nitrogen adsorption-desorption test 2 / g, porosity 97%, density 0.04g / cm 3 .

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Abstract

The invention discloses a preparation method of chitin aerogel, comprising the following steps of: immersing a chitin solution into a coagulant, regenerating, washing to obtain chitin hydrogel; displacing water in the chitin hydrogel with an organic liquid to obtain chitin organogel; drying the chitin hydrogel or organogel to remove the liquid so as to obtain the chitin aerogel; carrying out deacetylation on the chitin hydrogel, washing to obtain chitosan hydrogel; displacing water in the chitosan hydrogel with an organic liquid to obtain chitosan organogel; drying the chitosan hydrogel or organogel to remove the liquid so as to obtain chitosan aerogel; and carrying out heat treatment on the chitin and chitosan aerogel over 150 DEG C so as to obtain carbon aerogel. Through a nitrogen adsorption-desorption test, the specific surface area of the chitin aerogel, chitosan aerogel and carbon aerogel reaches 300m<2> / g or more than 300m<2> / g.

Description

technical field [0001] The invention relates to a preparation method of chitin airgel, which belongs to the field of new materials. technical background [0002] Airgel is a solid form of matter and is one of the least dense solids in the world. Because of its extremely low density, the lightest silicon aerogel is only 3 mg per cubic centimeter, which is three times heavier than air, so it is also called "frozen smoke". [0003] Airgel has a nanoporous three-dimensional network structure with high permeability, extremely high porosity, extremely low density, and high specific surface area. , catalysis, optoelectronics, sensors, biomedicine and other aspects have a wide range of applications. [0004] As an advanced material developed in recent years, airgel is usually prepared from inorganic precursors by sol-gel method or from organic precursors by polymerization reaction to prepare wet gels, and then use supercritical drying and other technologies to remove the liquid in...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L5/08
Inventor 蔡杰丁贝贝张俐娜
Owner WUHAN UNIV
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