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Preparation of chitosan/cellulose aerogel balls with high formaldehyde adsorption characteristics

A formaldehyde adsorption, cellulose technology, applied in the directions of alkali metal oxides/hydroxides, inorganic chemistry, alkali metal compounds, etc., can solve the problems of lack of specificity of formaldehyde, reduced adsorption rate, etc., and achieve mild conditions and effective removal , the effect of excellent performance

Inactive Publication Date: 2019-10-15
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional physical adsorption method does not have the specificity of formaldehyde, and other small molecules in the air will also occupy the adsorption sites of formaldehyde, resulting in a decrease in the adsorption rate. temperature)

Method used

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  • Preparation of chitosan/cellulose aerogel balls with high formaldehyde adsorption characteristics
  • Preparation of chitosan/cellulose aerogel balls with high formaldehyde adsorption characteristics
  • Preparation of chitosan/cellulose aerogel balls with high formaldehyde adsorption characteristics

Examples

Experimental program
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Effect test

example 1

[0022] A kind of preparation method of chitosan / cellulose formaldehyde adsorption airgel:

[0023] Step (1) freeze-dry the dissolving slurry after acidolysis with hydrochloric acid / ethanol, dissolve it in NaOH / urea / water solution, and stir it at -12°C using a low-temperature cooling liquid circulation pump to obtain a mass concentration of 1 wt% to 5 wt%. Cellulose solution. The solution is added dropwise into the acidic regeneration solution with a rubber dropper, and solidified for 5-30 minutes to obtain cellulose gel balls. The obtained gel balls are replaced and washed with distilled water and ethanol for 3 to 5 times to finally obtain cellulose wet gel balls.

[0024] Step (2) adding chitosan into the NaOH / urea / water mixed solution, and freezing and thawing repeatedly to obtain a chitosan solution with a mass fraction of 1wt%-5wt%. Then immerse the cellulose wet gel balls obtained in step (1) in chitosan solutions with different mass fractions at normal temperature for ...

example 2

[0027] A kind of preparation method of chitosan / cellulose formaldehyde adsorption airgel:

[0028] Step (1) freeze-dry the dissolving pulp after hydrochloric acid / ethanol acid hydrolysis, dissolve it in NaOH / urea / water solution, and use a low-temperature cooling liquid circulation pump to stir at -12°C to obtain cellulose with a mass concentration of 5 wt%. solution. The solution is added dropwise into the acidic regeneration solution with a rubber dropper, and solidified for 5-30 minutes to obtain cellulose gel balls. The obtained gel balls are replaced and washed with distilled water and ethanol for 3 to 5 times to obtain cellulose wet gel balls.

[0029] Step (2) Chitosan is added to NaOH / urea / water (mass ratio is 6 / 5 / 98) mixed solution, after repeated freezing and thawing, a chitosan solution with a mass fraction of 2wt% is obtained. Then immerse the cellulose gel balls obtained in the step (1) in chitosan solutions with different mass fractions at normal temperature for...

example 3

[0032] A kind of preparation method of chitosan / cellulose formaldehyde adsorption airgel:

[0033] Step (1) Add the cellulose acid-hydrolyzed with hydrochloric acid / ethanol to the mixed solution of urea / NaOH / water at a temperature of -15 to -12° C., and stir thoroughly to obtain a cellulose solution with a mass fraction of 5 wt%. The solution is added dropwise into the acidic regeneration solution with a rubber dropper, and cured for 5-30 minutes to obtain cellulose wet gel balls. The obtained gel balls are replaced and washed with distilled water and ethanol for 3 to 5 times to obtain cellulose wet gel balls.

[0034] Step (2) Chitosan is added to NaOH / urea / water mixture and repeatedly frozen and thawed to obtain a chitosan solution with a mass fraction of 2 wt%. Then immerse the cellulose gel balls obtained in step (1) in chitosan solutions with different mass fractions for 3-5 hours, and the immersion temperature is 0-60°C to obtain different cellulose / chitosan wet gel bal...

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Abstract

The invention specifically discloses a preparation method of a chitosan modified cellulose composite aerogel. The raw materials are cellulose and chitosan. The preparation method comprises the following steps: acidolyzing the cellulose to prepare a cellulose solution, then dropwise adding the cellulose solution to a regeneration solution to obtain cellulose wet gel balls, dipping the gel balls into the chitosan solution to obtain cellulose-chitosan composite wet gel balls, and freeze-drying to obtain the cellulose-chitosan composite aerogel balls with high-efficiency formaldehyde adsorption characteristics. The cellulose / chitosan composite aerogel balls have large specific surface area and porosity, strong adsorption performance on formaldehyde and good application prospect.

Description

technical field [0001] The invention relates to the technical field of organic airgel, in particular to a preparation method of cellulose / chitosan composite airgel balls. Background technique [0002] Formaldehyde is a kind of colorless, irritating and special pungent poisonous gas. Generally, a considerable amount of formaldehyde will be produced in newly decorated rooms such as furniture, wallpaper, paint and second-hand smoke. In the production process of clothing fabrics, in order to achieve anti-wrinkle, anti-shrinkage, flame retardant, etc., or to maintain the durability of printing and dyeing and improve the hand feeling, formaldehyde will be added to the additives. When indoor formaldehyde reaches a certain concentration, it will cause great damage to the human body's sense of smell, liver, lungs and immune system. The residual formaldehyde in clothing fabrics will directly cause harm to human skin, and the cause of leukemia and other cancers is also due to formaldeh...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L1/02C08L5/08B01J20/24B01J20/28B01J20/30B01D53/02
CPCC08J9/28B01J20/24B01J20/28047B01D53/02C08J2201/0484C08J2301/02C08J2405/08C08J2305/08C08J2401/02
Inventor 霍丹杨秋林徐雁鸿
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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