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Preparation method of cellulose aerogel-based efficient air filtering membrane

A high-efficiency air filtration, aerogel-based technology, applied in separation methods, dispersed particle filtration, chemical instruments and methods, etc., can solve the problems of high material cost, unfavorable for practical application, large fiber diameter, etc. Conducive to mass production and promotion, the effect of excellent mechanical properties

Active Publication Date: 2021-06-01
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of filter that can capture particles from gases effectively without causing damage or contamination during its use. It's made up of tiny fibers attached together through strong bonds between them called cellulosic material. These filters work well even when used under harsh conditions like dusty environments where they may be affected negatively. They also provide good strength while being cost-effective compared to existing methods such as activated carbon filtering systems.

Problems solved by technology

This patented technical problem addressed in this patents relates to controlling the amount or concentration of suspended particulates (SPM), specifically those that can damage sensitive electronic devices used within indoor environments like computer systems. Existing methods involve expensive specialty chemicals, but they cannot be applied directly because these agents may affect other components inside the device's enclosure causing malfunctions. There also exist concerns about potential health hazards associated with certain types of respiratory illness related diseases.

Method used

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  • Preparation method of cellulose aerogel-based efficient air filtering membrane
  • Preparation method of cellulose aerogel-based efficient air filtering membrane
  • Preparation method of cellulose aerogel-based efficient air filtering membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1, the mass fraction is 0.005% microbial cellulose airgel-based preparation of high-efficiency air filtration membrane.

[0027] Step 1, pretreatment of pure microbial cellulose hydrogel block:

[0028] Wash 50g of microbial cellulose hydrogel (food-grade coconut pieces) with excess deionized water for 4h to wash off the sugar, react with 4% sodium hydroxide solution 500mL at 80°C for 8h, and then use deionized Wash to neutral;

[0029] Wherein, the alkaline solution is sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, etc., preferably sodium hydroxide solution.

[0030] Step 2, oxidation of microbial cellulose:

[0031] Add water to the microbial cellulose hydrogel block prepared in step 1 and beat it into a slurry with a cooking machine, centrifuge to make the concentration of the microbial cellulose slurry 2.0%, and then add 0.0065g TEMPO, 0.040g sodium bromide and 0.58mL sodium hypochlorite in sequence Add 20.0 mL of cent...

Embodiment 2

[0039] Example 2, preparation of 0.01% microbial cellulose airgel-based high-efficiency air filtration membrane with a mass fraction of 0.01%.

[0040] Step 1, pretreatment of pure microbial cellulose hydrogel block:

[0041] Wash 50g of microbial cellulose hydrogel (food-grade coconut pieces) with excess deionized water for 4h to wash off the sugar, react it with 4% sodium hydroxide solution at 85°C for 7.5h, and then use it Ionic water wash to neutral;

[0042] Wherein, the alkaline solution is sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, preferably sodium hydroxide solution.

[0043] Step 2, oxidation of microbial cellulose:

[0044] Add water to the microbial cellulose hydrogel block prepared in step 1 and beat it into a slurry with a beater, centrifuge to make the concentration of the microbial cellulose slurry 2.2%, and then add 0.0096g TEMPO, 0.06g sodium bromide and 0.87mL sodium hypochlorite in sequence Add it to 30.0 mL of ce...

Embodiment 3

[0051] Embodiment 3, the mass fraction is the preparation of 0.015% microbial cellulose airgel-based high-efficiency air filtration membrane.

[0052] Step 1, pretreatment of pure microbial cellulose hydrogel block:

[0053] Wash 50g of microbial cellulose hydrogel (food-grade coconut pieces) with excess deionized water for 4h to wash off the sugar, react with 500mL of 5% sodium hydroxide solution at 90°C for 7h, and then use deionized Wash to neutral;

[0054] Wherein, the alkaline solution is sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, preferably sodium hydroxide solution.

[0055] Step 2, oxidation of microbial cellulose:

[0056] Add water to the microbial cellulose hydrogel block prepared in step 1 and beat it into a slurry with a beater, centrifuge to make the concentration of the microbial cellulose slurry 2.5%, and then mix 0.0128g TEMPO, 0.08g sodium bromide and 1.16mL sodium hypochlorite in sequence Add 40.0 mL of centrifuge...

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Abstract

The invention discloses a preparation method of a cellulose aerogel-based efficient air filtering membrane, and belongs to the field of air filtering materials. The preparation method comprises the following steps: performing water washing, soda boiling, oxidation and the like on microbial cellulose, dispersing in a mixed solution of tert-butyl alcohol and water to obtain cellulose dispersion liquids with different concentrations, pouring the cellulose dispersion liquids into molds for molding, and performing freeze drying to obtain the microbial cellulose aerogel-based efficient air filtering membranes with different thicknesses. The microstructure of the air filtering membrane is a three-dimensional nanometer network formed by microbial cellulose nanofibers, the macroscopic form of the air filtering membrane is in a thin film shape, and the membrane forming process is a physical process, is free of chemical reaction and is green, simple and convenient; the air filtering membrane with the thickness of 1-5mm prepared by the method has high filtering efficiency of removing PM0.3 at a high air flow rate, the highest filtering efficiency can reach 99.9% or above, the air resistance is less than 250Pa, the preparation process is simple, and large-scale production is facilitated.

Description

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Claims

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Application Information

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Owner INNER MONGOLIA UNIV OF SCI & TECH
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