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Superhydrophobic cotton cellulose aerogel, and preparation method and application thereof

A technology of cellulose airgel and cotton cellulose, applied in the field of airgel, can solve the problems of high preparation cost, cumbersome preparation process, and low density of cellulose airgel, and achieve low preparation cost, simple process, high The effect of hydrophobicity

Pending Publication Date: 2019-12-17
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of cotton cellulose airgel and its preparation method and application, this airgel has low density, high hydrophobicity, high oil absorption rate and excellent oil retention performance; Its preparation method is simple and effective, easy The operation and cost are low, and the mass production of airgel can be realized, which solves the problems of high preparation cost, cumbersome preparation process and the limitation of its use as an oil-water separation material due to the preparation method

Method used

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  • Superhydrophobic cotton cellulose aerogel, and preparation method and application thereof
  • Superhydrophobic cotton cellulose aerogel, and preparation method and application thereof
  • Superhydrophobic cotton cellulose aerogel, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] 1. Add cotton fiber into 12wt% sodium hydroxide solution, pretreat at 80°C for 1 hour, wash with distilled water, and fully dry. 3.0 g of pretreated cotton fiber was added to 98.5 mL of NaOH solution (14 wt %) precooled at -20° C. for 25 min. Stir at 800 rpm for 5 min, then add a mixed solution (98.5 mL) containing 3.0 wt% urea and 1.0 wt% thiourea into the cotton fiber dispersion, and stir evenly to obtain a cotton cellulose solution. Subsequently, the resulting cotton cellulose solution is transferred to the desired mold.

[0046] 2. Put the cotton cellulose solution at 80°C for 3 hours, after it is completely gelled, soak it in 6wt% hydrochloric acid solution for 24 hours, and finally replace it with distilled water until it is neutral, and you can get cotton cellulose water gel.

[0047] 3. The obtained cotton cellulose hydrogel was frozen at -15°C for 32 hours to obtain cotton cellulose jelly, and then the sample was freeze-dried at -80°C for 48 hours to obtain h...

Embodiment 2

[0054] 1. Add the cotton fiber into 6wt% sodium hydroxide solution, pretreat it at 80°C for 4 hours, wash it with distilled water, and dry it fully. 5.0 g of pretreated cotton fiber was added to 97.5 mL of NaOH solution (10 wt %) precooled at -20° C. for 25 min. Stir at 800 rpm for 5 min, then add a mixed solution (97.5 mL) containing 4.5 wt% urea and 0.5 wt% thiourea into the cotton fiber dispersion, and stir evenly to obtain a cotton cellulose solution. Subsequently, the resulting cotton cellulose solution is transferred to the desired mold.

[0055] 2. Put the cotton cellulose solution at 50°C for 36 hours, after it is completely gelled, soak it in 2wt% hydrochloric acid solution for 48 hours, and finally replace it with distilled water until it is neutral, and you can get cotton cellulose water gel.

[0056] 3. The obtained cotton cellulose hydrogel was frozen at -15°C for 32 hours to obtain cotton cellulose jelly, and then the sample was freeze-dried at -80°C for 48 hou...

Embodiment 3

[0060] 1. Add cotton fiber to 16wt% sodium hydroxide solution, pretreat at 40°C for 0.5 hour, wash with distilled water, and fully dry. 7.0 g of pretreated cotton fiber was added to 96.5 mL of NaOH solution (14 wt %) precooled at -20° C. for 25 min. Stir at 800 rpm for 5 min, then add a mixed solution (96.5 mL) containing 3.0 wt% urea and 1.0 wt% thiourea into the cotton fiber dispersion, and stir evenly to obtain a cotton cellulose solution. Subsequently, the resulting cotton cellulose solution is transferred to the desired mold.

[0061] 2. Put the cotton cellulose solution at 80°C for 30 hours, after it is completely gelled, soak it in 10wt% hydrochloric acid solution for 48 hours, and finally replace it with distilled water until it is neutral, and you can get cotton cellulose water gel.

[0062] 3. The obtained cotton cellulose hydrogel was frozen at -15°C for 24 hours to obtain cotton cellulose jelly, and then the sample was freeze-dried at -40°C for 48 hours to obtain...

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Abstract

The invention belongs to the field of aerogels, and discloses superhydrophobic cotton cellulose aerogel, and a preparation method and an application thereof. The superhydrophobic cotton cellulose aerogel is prepared from a cotton fiber, the superhydrophobic cotton cellulose aerogel has a three-dimensional network porous structure, the surface of the superhydrophobic cotton cellulose aerogel contains hydrophobic groups, and the water contact angle of the superhydrophobic cotton cellulose aerogel is 140-155 DEG. A cotton cellulose solution is prepared from the cotton fiber, then a cotton cellulose hydrogel and a hydrophilic cotton cellulose aerogel are sequentially obtained, and the hydrophilic cotton cellulose aerogel undergoes hydrophobic modification to obtain the superhydrophobic cottoncellulose aerogel. Compared with organically synthesized oil absorption materials, the aerogel has the advantages of super-light weight, superhydrophobicity, high oil absorption rate and high oil retention performance. The preparation method has the characteristics of simple process, low cost, environmental friendliness and greenness, is suitable for industrial mass production, and makes the product widely applied to treatment of oily wastewater discharged in the industries of chemical processing, food production, kitchens, automobile repair and the like.

Description

technical field [0001] The invention belongs to the field of airgel and relates to a superhydrophobic airgel, in particular to a superhydrophobic cotton cellulose airgel and a preparation method and application thereof. Background technique [0002] Oil spills and the discharge of industrial and domestic waste oil have caused serious pollution to the water ecological environment. If the waste oil in water is not treated effectively and timely, it will cause immeasurable harm to the surrounding environment and human health. At present, the method favored by people is to use various organic synthetic materials such as polyurethane foam, polypropylene fiber, etc. as adsorption materials to selectively absorb oil from oily wastewater and use simple mechanical extrusion to recover oil, and finally achieve oil-water separation. Purpose. Although organic synthetic materials have good lipophilic and hydrophobic properties, such materials are not easy to biodegrade and will cause s...

Claims

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Application Information

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IPC IPC(8): B01J13/00B01J20/24B01J20/28B01J20/30C02F1/28C02F1/40E02B15/04B01D17/02B01D17/022
CPCB01J13/0091B01J20/24B01J20/28047C02F1/40C02F1/286E02B15/04B01D17/0202B01J2220/4825Y02A20/204
Inventor 王锦涛韩凤兰
Owner BEIFANG UNIV OF NATITIES
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