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Biological nano-composite and preparation method and application thereof

A composite material, bio-nano technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as limiting the scope of use, and achieve the effect of avoiding separation and purification steps, high adhesion, and improved absorption

Inactive Publication Date: 2017-02-22
EAST CHINA NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because chitosan contains a large amount of free amines in its molecule, it easily reacts with formaldehyde and acetaldehyde molecules to generate a stable imine polymer. Patent 200734415 discloses a coating prepared by mixing chitin and PVA, which has good The function of adsorbing aldehyde compounds, but this material can only adsorb harmful gases of aldehydes, but is helpless to harmful gases of benzene, amine, and sulfur, which greatly limits its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Under magnetic stirring, disperse 30 shells of 400-mesh chitin powder in 200 grams of deionized water, add 0.5 grams of chitinase, and put it in a cool place to stir and ferment for 4 days to prepare a chitosan active dispersion.

[0039] Disperse 15 grams of nano-diatomite powder in 100 grams of aqueous solution, add 5 grams of nano-silica sol, 0.2 grams of organic silicon surfactant, and grind with a ball mill. After grinding for a period of time, add 0.1 grams of nano-silver sol , and continue grinding to prepare a uniformly dispersed inorganic nano-sol.

[0040] The above-mentioned chitosan active dispersion is added in the inorganic nano-sol, and the bio-nanometer composite material is prepared after continuing ball milling for 2 hours.

Embodiment 2

[0042] Under magnetic stirring, disperse 20 shells of 1000-mesh chitin powder in 150 g of deionized water, add 0.3 g of chitinase, and place in a cool place to stir and ferment for 4 days to prepare a chitosan active dispersion.

[0043] Disperse 35 grams of nano-diatomite powder in 200 grams of aqueous solution, add 15 grams of nano-silica sol, 0.4 grams of silicone surfactant, and grind with a ball mill. After grinding for a period of time, add 0.2 grams of nano-silver sol , and continue grinding to prepare a uniformly dispersed inorganic nano-sol.

[0044] Add the chitosan active dispersion liquid into the inorganic nano sol, and continue ball milling for 2 hours to prepare the biological nanocomposite material.

Embodiment 3

[0046] 50 grams of biocomposites prepared in Example 1 were sprayed on the surface of 4 pieces of 0.25 meters × 0.25 meters of transparent glass by spraying process, after drying at room temperature, placed in the experimental chamber of 1 cubic meter, injected into 4 microliters of formaldehyde; as a comparison, in another experimental chamber, no composite material glass was placed, and 4 microliters of formaldehyde was directly injected. After 4 hours, the measured formaldehyde content in the two chambers was 0.04 mg / m3 and 1.08 mg / m3 respectively. cubic meters, it can be seen that the biocomposite material has a good effect of removing formaldehyde.

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PUM

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Abstract

The invention discloses a biological nano-composite and a preparation method thereof. The method includes the steps that bio-enzymes and chitin are fermented at room temperature to prepare a chitin active composite, inorganic nano-sol is prepared, the chitin active composite is directly mixed with the inorganic nano-sol, and the biological nano-composite is prepared. The biological nano-composite is constructed on the surface of an object through the spraying or brushing process, a stable coating can be formed, and the coating can effectively remove harmful gas in indoor environments, and has a durable effect.

Description

technical field [0001] The invention relates to the field of biological nanocomposite materials, in particular to a biological nanocomposite material, its preparation and its application in removing harmful gases from indoor environments. Background technique [0002] With the rapid development of social economy and the improvement of human living standards, indoor environmental pollution has become the focus of social attention, and people pay more and more attention to indoor air quality. There are a large number of chemical substances polluting indoor air, among which the secondary pollution caused by volatile organic compounds with neurotoxicity, nephrotoxicity, hepatotoxicity and carcinogenicity has posed a great threat to human health. According to the statistics of the World Health Organization, the number of deaths due to indoor environmental pollution has reached 2.8 million worldwide every year; relevant statistics from the national indoor air testing department sh...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08K9/06C08K3/36C08K3/08B01D53/84B01D53/72B01D53/48B01D53/54C12P19/26
CPCB01D53/48B01D53/54B01D53/72B01D53/84B01D2258/06C08K3/08C08K3/36C08K9/06C08K2003/0806C08K2201/006C08K2201/011C12P19/26C08L5/08Y02A50/20
Inventor 林和春孟庆祝
Owner EAST CHINA NORMAL UNIV