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Chitin-nanometer-fiber aerogel with high specific surface area and preparing method thereof

A high specific surface area and nanofiber technology, applied in the field of fiber airgel, can solve the problems of difficult process control, high price, high toxicity, etc., and achieve the effects of reducing experimental costs, high safety, and reducing pollution

Active Publication Date: 2016-05-11
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the solvent used in the solvent dissolution and regeneration treatment in the existing chitin airgel preparation process is highly corrosive, expensive, highly toxic, complex and difficult to control, and the obtained chitin airgel has low porosity. Insufficiencies such as small specific surface area provide a chitin nanofiber aerogel with a high specific surface area and a preparation method thereof

Method used

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  • Chitin-nanometer-fiber aerogel with high specific surface area and preparing method thereof
  • Chitin-nanometer-fiber aerogel with high specific surface area and preparing method thereof
  • Chitin-nanometer-fiber aerogel with high specific surface area and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Extract 2g of industrial waste shrimp shells with phenylethanol at a ratio of 1:2 to remove some organic matter, then use glacial acetic acid to adjust the pH to 4.8 and add 1wt% NaClO 2 , heating at 80°C for 3h to bleach;

[0045] 2. The bleached shrimp shells were prepared as a 1wt% dispersion by mechanical disc grinding to obtain a 1wt% coarse chitin dispersion;

[0046] 3. Add the phosphate buffer solution to the above dispersion, adjust the pH of the dispersion to 6.8, stir on a magnetic stirrer at 1300 rpm, at room temperature and pressure for 15 minutes;

[0047] 4. Then add TEMPO and NaClO, after the dispersion is uniform, then add NaClO 2 , TEMPO:NaClO:NaClO 2 The molar ratio is 1:10:100, and the container is quickly sealed and heated to 80°C for 2.5 hours. After the reaction, add 15ml of ethanol to terminate the reaction;

[0048] 5. Repeatedly rinse the obtained dispersion with deionized water to neutrality, and then use an ultrasonic pulverizer (1500W)...

Embodiment 2

[0051] 1. Purchase 2g of bleached chitin on the market, crush it through an 80-mesh sieve, prepare a 1wt% dispersion, and store it at 4°C

[0052] 2. Take 400ml of the above dispersion, stir evenly, add 360ml of phosphate buffer solution, adjust the pH of the dispersion to 7.

[0053] 3. After that, add TEMPO and NaBr, disperse evenly, then add NaClO, the molar ratio of TEMPO: NaBr: NaClO is 1:10:25, quickly seal the container and heat it to 70°C for 2 hours, after the reaction, add 10ml of ethanol to terminate the reaction;

[0054] 4. Repeatedly rinse the obtained dispersion with deionized water until it becomes neutral, and then use an ultrasonic pulverizer (1500W) to sonicate the dispersion for 1.5 hours;

[0055] 5. Substituting the dispersion liquid with tert-butanol to obtain a gel, freezing the obtained gel at -20° C. for 4 hours, and obtaining the chitin nanofiber airgel after freeze-drying.

Embodiment 3

[0057] 1. Treat industrially discarded crab shells with phenylethanol at 80°C for 6.5 hours at a ratio of 1:2, then adjust the pH to 4.8 with hydrochloric acid and add 1wt% NaClO 2 Heat at 90°C for 2.5h, and after cleaning, glue-mill the remaining solid matter into a 1wt% dispersion;

[0058] 2. Take 400ml of the above dispersion, add the phosphate buffer solution to the above dispersion, adjust the pH=6.5, stir evenly, add 0.064g of TEMPO and 0.4g of NaBr, after the dispersion is uniform, then add 2mol / LNaClO2ml, use 0.5mol / LNaOH Control the pH of the dispersion to 10, react for 1.5h, and then add 20ml of ethanol to terminate the reaction;

[0059] 3. Repeatedly rinse the obtained dispersion with deionized water to neutrality, and then use an ultrasonic pulverizer (1500W) to sonicate the dispersion for 0.5h;

[0060] 4. The dispersion liquid was replaced with n-butanol to obtain a gel, the obtained gel was frozen at -80° C. for 4 hours, and the chitin nanofiber airgel was ob...

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Abstract

The invention discloses a chitin-nanometer-fiber aerogel with the high specific surface area. A preparing method includes the steps that a chitin nanometer fiber is prepared with the TEMPO oxidizing method or the mechanical method, and then the superfine nanometer-chitin aerogel is prepared through higher alcohol replacement and drying. According to the chitin-nanometer-fiber aerogel and the preparing method, the preparing process is simple, and the technology is easy to control; a used oxidizing agent is an environment-friendly solvent, safe and nontoxic, the environment-friendly preparing technology is achieved, and cost is reduced; the prepared chitin-nanometer-fiber aerogel is nontoxic, low in density, high in porosity and even in structural unit distribution, and most prominently, the high specific surface area is achieved.

Description

technical field [0001] The invention relates to fiber airgel, in particular to a chitin nanofiber airgel with high specific surface area and a preparation method thereof. Background technique [0002] The particle size of chitin nanofibers is between 1 and 200nm, which is a typical one-dimensional nanomaterial. The raw materials for the synthesis of chitin nanofibers come from a wide range of sources, such as arthropod shells, mollusc inner shells, cartilage, and fungi. The raw materials selected by the method are shells of arthropods such as shrimp skins and crab shells, and inner shells of molluscs such as octopus, squid and fungus cells. These raw materials are biodegradable and non-toxic. They are natural polymers with the world's output second only to plant cellulose, and are ideal precursors for chitin aerogels. [0003] Chitin airgel is a polymer solid-state material with a porous network structure formed by the aggregation of extremely low-level chitin nanofibers i...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/09C08J3/075C08J3/00C08L5/08C08B37/08
CPCC08B37/003C08J3/00C08J3/075C08J3/09C08J9/28C08J2201/0482C08J2305/08C08L2203/14
Inventor 卢芸刘波叶贵超余敏姜笑梅殷亚方
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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