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A preparation method of superhydrophobic cellulose/chitosan composite airgel oil-water separation material

A composite aerogel and composite hydrogel technology is applied in the field of preparation of superhydrophobic cellulose/chitosan composite aerogel oil-water separation materials, which can solve the problem of destroying the modified substrate structure, wasting modifiers, modifying Low efficiency and other problems, to achieve the effect of wide source, large oil storage space, and simple steps

Active Publication Date: 2018-04-10
刘 志勇 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, these methods destroy the original structure of the modified substrate, and at the same time, there are problems such as low modification efficiency, long cycle time, and a large amount of waste modifiers.

Method used

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  • A preparation method of superhydrophobic cellulose/chitosan composite airgel oil-water separation material
  • A preparation method of superhydrophobic cellulose/chitosan composite airgel oil-water separation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The first step: preparation of cellulose / chitosan composite solution

[0018] Take 40 parts of deionized water, 3.5 parts of sodium hydroxide and 6 parts of urea into the reactor, stir at -15°C for 0.5 hours, then add 0.5 parts of cellulose and 1.5 parts of chitosan, at 1000r / min Stirring 10h at a certain stirring speed to obtain a cellulose / chitosan mixed solution. The obtained mixed solution was cooled to -20°C, frozen for 12 hours to obtain a solid, taken out, thawed and stirred at 25°C for 30 minutes, and obtained a uniform cellulose / chitosan composite solution through 2 freeze-thaw cycles, at 10000r / min Centrifuge for 5 minutes under the condition of rotating speed to remove air bubbles to obtain a transparent cellulose / chitosan composite solution, which is set aside.

[0019] The second step: Preparation of cellulose / chitosan composite airgel

[0020] Take 30 parts of cellulose / chitosan composite solution, pour it into a mold, freeze at -20°C for 12 hours to obt...

Embodiment 2

[0024] The first step: preparation of cellulose / chitosan composite solution

[0025] Take 50 parts of deionized water, 2.5 parts of sodium hydroxide and 3 parts of urea into the reactor, stir at -15°C for 0.5 hours, then add 1.5 parts of cellulose and 0.5 parts of chitosan, at 800r / min Stir for 12h at a certain stirring speed to obtain a cellulose / chitosan mixed solution. The resulting mixed solution was cooled to -20°C, frozen for 12 hours to obtain a solid, taken out, thawed and stirred at 25°C for 30 minutes, and obtained a uniform cellulose / chitosan composite solution through 3 freeze-thaw cycles, at 10000r / min Centrifuge for 5 minutes under the condition of rotating speed to remove air bubbles to obtain a transparent cellulose / chitosan composite solution, which is set aside.

[0026] The second step: Preparation of cellulose / chitosan composite airgel

[0027] Take 60 parts of cellulose / chitosan composite solution, pour it into a mold, freeze at -20°C for 12 hours to obt...

Embodiment 3

[0031] The first step: preparation of cellulose / chitosan composite solution

[0032] Take 80 parts of deionized water, 7 parts of sodium hydroxide and 12 parts of urea into the reaction kettle, stir at -15°C for 1 hour, then add 2.5 parts of cellulose and 1.5 parts of chitosan, at 1200r / min Stir at a stirring speed for 10 h to obtain a cellulose / chitosan mixed solution. The obtained mixed solution was cooled to -20°C, frozen for 12 hours to obtain a solid, taken out, thawed and stirred at 25°C for 30 minutes, and obtained a uniform cellulose / chitosan composite solution through 4 freeze-thaw cycles, at 10000r / min Centrifuge for 5 minutes under the condition of rotating speed to remove air bubbles to obtain a transparent cellulose / chitosan composite solution, which is set aside.

[0033] The second step: Preparation of cellulose / chitosan composite airgel

[0034] Take 90 parts of cellulose / chitosan composite solution, pour it into a mold, freeze at -20°C for 12 hours to obtain...

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Abstract

The invention relates to a preparation method of a super-hydrophobic cellulose / chitosan compound aerogel oil-water separation material. The method includes the first step of cellulose / chitosan compound solution preparation, the second step of cellulose / chitosan compound aerogel preparation, and the third step of super-hydrophobic cellulose / chitosan compound aerogel preparation. Prepared cellulose / chitosan compound aerogel has a high pore rate, the surface of the cellulose / chitosan compound aerogel has high roughness, the preparation process is simple, and raw materials are wide in source, low in cost, green and environmentally friendly. By means of the related hydrophobic modification method, super-hydrophobic fruit can be rapidly and effectively obtained in an energy-saving mode, and greasy dirt collection, oil-water separation and the like can be economically and rapidly achieved.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophobic cellulose / chitosan composite airgel oil-water separation material. Background technique [0002] With the development of industry and the improvement of people's living standards, the discharge of oil pollution is increasing day by day, and the pollution caused by oily waste water, waste liquid, and offshore oil spills has become increasingly prominent. According to statistics, at least 5 million to 10 million tons of oil enter various water bodies every year in the world, especially oil spill accidents at sea, which often cause very serious ecological consequences. At present, the main treatment method of oily wastewater is to use hydrophobic and lipophilic adsorption materials to separate and collect these organic pollutants from water, and then reuse them through existing technologies. But most of them are carbonaceous materials, such as porous aerogels prepared from carbon nanotub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
CPCB01J20/24B01J20/28047B01J2220/4825
Inventor 刘志勇吴建宁孟桂花彭慧丽
Owner 刘 志勇
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