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A kind of cellulose airgel modified by surfactant and preparation method thereof

A technology of cellulose airgel and surfactant, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problem of fragility and deformation, easy collapse of pore structure, and low strength and other problems, to achieve the effect of simple preparation method, reduced pore structure collapse, and uniform pore structure

Active Publication Date: 2021-08-06
福州特实科技有限公司
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Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a preparation method of a novel airgel, and the purpose of improving the present invention is to provide a novel modified airgel material and a preparation method thereof, aiming to solve the problem of simple cellulose airgel The pore structure is easy to collapse when dry, and there are problems such as low strength, fragility and deformation during use

Method used

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  • A kind of cellulose airgel modified by surfactant and preparation method thereof
  • A kind of cellulose airgel modified by surfactant and preparation method thereof
  • A kind of cellulose airgel modified by surfactant and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] The preparation method of surfactant modified cellulose airgel, carries out as follows:

[0037] (1) Take 100 mL of NaOH / urea / water (mass ratio 7:12:81) as a solvent, dissolve 3 g of wheat straw cellulose, stir evenly, freeze in a -20°C refrigerator for 12 h, thaw and ultrasonicate After 30 min of treatment, a transparent cellulose solution was obtained.

[0038] (2) Add 0.09 g of surfactant polytrimethylene adipate to the cellulose solution and stir well with a magnetic stirrer.

[0039] (3) Centrifuge the evenly stirred mixed solution of cellulose and surfactant at 5000 r / min for 5 min, and then place it in a constant temperature water bath at 50°C for 5 h to make it gel.

[0040] (4) The fully reacted hydrogel was aged at room temperature for 24 h, and washed and soaked repeatedly with deionized water to remove unreacted surfactants and other substances.

[0041] (5) Adjust the pH to neutral with 1 mol / L hydrochloric acid.

[0042] (6) The solvent was replaced wit...

Embodiment 2

[0053] (1) Take 100 mL of the azo dye Congo red solution with a concentration of 100 mg / L in a 150 mL Erlenmeyer flask, add 0.2 g of modified wheat straw cellulose aerogel and unmodified wheat straw cellulose aerogel respectively , oscillating and adsorbing at room temperature for 24h, after taking out the filter membrane of 0.22μm, measure its absorbance at 560nm.

[0054] (2) The adsorption efficiency of the modified wheat straw cellulose airgel to the azo dye Congo red solution reached 95.82%, and the adsorption capacity reached 47.91 mg / g. According to its concentration gradient factor test, it can be seen that the adsorption of high and low concentration Congo red solutions has achieved ideal results.

[0055] (3) The adsorption efficiency of the unmodified wheat straw cellulose airgel to the azo dye Congo red solution was only 70.06%, and the adsorption capacity was only 35.03mg / g. According to its concentration gradient factor test, it can be seen that the adsorption of ...

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Abstract

The invention relates to a cellulose airgel modified by a surfactant and a preparation method thereof. Using wheat straw cellulose as raw material, sodium hydroxide / urea / water (mass ratio: 7:12:81) mixed solution is dissolved as solvent to obtain cellulose solution, and then a certain amount of surfactant is added for modification, after centrifugation Defoaming, water bath, aging, solvent replacement and normal pressure drying were used to obtain surfactant-modified cellulose aerogels. Applying the modified airgel prepared by the present invention in the organic dye wastewater treatment process can make the removal efficiency of Congo red reach 90.52%-95.82%. The airgel has a porous network structure with large porosity, high strength and uniform shape, and the preparation process is simple. The modifying agent used in the present invention is an environment-friendly surfactant, and the drying process uses normal pressure drying, which makes the preparation process more environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of new material application, and relates to a preparation method of cellulose airgel modified by a surfactant and its application to the treatment of colored dye wastewater. Background technique [0002] With the rise of green chemical materials, a new type of cellulose airgel has been studied in recent years, which has the characteristics of large specific surface area, extremely low density, acid and alkali resistance, and high adsorption capacity, and has a wide range of raw materials for preparation. The method is simple and has been widely concerned in the fields of sewage treatment and ecological environment restoration. However, there are still many problems in cellulose aerogels that limit its development and application, such as poor mechanical properties, low mechanical strength, and easy collapse of internal pores in traditionally prepared cellulose aerogels. [0003] In recent years, phthalate p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08L67/02C08J9/28B01J20/24B01J20/28B01J20/30C02F101/38C02F101/34C02F101/30
CPCB01J20/24B01J20/28047B01J2220/4825C02F2101/308C02F2101/34C02F2101/38C02F2101/40C08J9/28C08J2205/026C08J2301/02C08J2467/02
Inventor 唐美珍贾婼兰阚洪媛刘振路孙梁伦杨世鑫杨月伟
Owner 福州特实科技有限公司
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