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Cellulose carbon aerogel for adsorbing oil pollutants

A carbon airgel and pollutant technology, which is applied in the direction of airgel preparation, hydrocarbon oil treatment, biofuel, etc., can solve the problem of low adsorption efficiency, achieve the effect of large adsorption capacity, low preparation cost, and easy recovery

Pending Publication Date: 2022-01-21
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, their products still have problems such as silanization and hydrophobic modification, and low adsorption efficiency. In contrast, the cellulose carbon airgel prepared by us has high adsorption efficiency, large adsorption capacity, and simple operation. The solvent can be recycled, the recovery rate is over 90%, green and environmentally friendly, suitable for large-scale production

Method used

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  • Cellulose carbon aerogel for adsorbing oil pollutants
  • Cellulose carbon aerogel for adsorbing oil pollutants
  • Cellulose carbon aerogel for adsorbing oil pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Put 7.8433g of glucose and 12.1567g of choline chloride into a small beaker, heat and stir in a water bath at 80°C for 2h;

[0032] (2) Mix the deep eutectic solvent in step (1) with 180 g of solution state NMMO·H 2 O mixed and stirred for 30min.

[0033] (3) Mix 6 g of cellulose and 0.12 g of ascorbic acid with the solvent obtained in step (1), put them into a double-layer glass reactor, and stir at -0.1 Pa at 80° C. for 1 h until it becomes an amber liquid.

[0034] (4) Pour the solution obtained in step (3) into a mold, and solidify at room temperature for 1 day, dissolve the solvent prepared in step (2) with deionized water for 2 days, and place the obtained hydrogel in a freeze dryer In 2d, cellulose airgel was obtained;

[0035] Tests show that the prepared cellulose airgel has almost no hydrophobicity, poor adsorption capacity for oil pollutants and organic solvents, and cannot achieve the effect of oil-water separation.

Embodiment 2

[0037] (1) At 80°C, 200g NMMO·H 2 O dissolves in a liquid state.

[0038] (2) Mix 6 g of cellulose and 0.12 g of ascorbic acid with the solvent obtained in step (1), put them into a double-layer glass reactor, and stir at -0.1 Pa at 100° C. for 1.5 h until an amber liquid is formed.

[0039] (3) Pour the solution obtained in step (2) into the mold and solidify at room temperature for 1 day, and dissolve the NMMO·H in step (1) with deionized water 2 O for 2d, the obtained cellulose hydrogel.

[0040] (4) Place in a freeze dryer for 2 days, and finally heat the airgel to 450° C. at 5° C. / min in an argon atmosphere, keep it warm for 2 hours, and cool to room temperature with the furnace to obtain cellulose.

[0041] The test shows that the prepared cellulose carbon airgel has extremely low adsorption performance to oil pollutants and organic solvents, and its hydrophobicity is very poor. Its 5min adsorption value is about 2-3g / g, and its adsorption capacity to oil is very poor ...

Embodiment 3

[0043] (1) Put 7.8433g of glucose and 12.1567g of choline chloride into a small beaker, heat and stir in a water bath at 80°C for 2 hours;

[0044] (2) Mix the deep eutectic solvent in step (1) with 180 g of solution state NMMO·H 2 O mixed and stirred for 30min.

[0045] (3) Mix 6 g of cellulose and 0.12 g of ascorbic acid with the solvent obtained in step (2), put them into a double-layer glass reactor, and stir at -0.1 Pa at 80° C. for 1 h until it becomes an amber liquid.

[0046] (4) Pour the solution obtained in step (3) into the mold and solidify at room temperature for 1 d, and dissolve the solvent prepared in step (2) with deionized water for 2 d to obtain a hydrogel.

[0047] (5) Dry the cellulose hydrogel in step (4) in a freeze dryer for 2 days to obtain cellulose aerogel, and finally heat the aerogel to 450 °C at 5°C / min under an argon atmosphere. ℃, keep warm for 2 hours, and cool down to room temperature with the furnace to obtain cellulose.

[0048] The test ...

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Abstract

The invention discloses a preparation method of cellulose carbon aerogel for adsorbing oil pollutants, which comprises the following steps: mixing a certain amount of glucose and choline chloride to form a deep eutectic solvent, uniformly conducting mixing with NMMO.H2O, fully conducting mixing, adding a formed mixture into a double-layer glass reaction kettle together with cotton pulp cellulose and ascorbic acid by an instrument, conducting heating and stirring at -0.1 Pa to obtain amber sticky liquid, then putting the amber sticky liquid into a mold, conducting standing for gelling at room temperature, putting a solidified sample into deionized water to replace a solvent, finally conducting drying by a freeze dryer to obtain aerogel, and further carbonizing the aerogel to obtain the cellulose carbon aerogel with good hydrophobicity. According to the method, a certain amount of deep eutectic solvent is mixed with a green solvent NMMO.H2O to dissolve cellulose, so that the method has good recoverability. Cellulose carbon aerogel with good hydrophobicity and oil absorption capacity is obtained through carbonization treatment, and the cellulose carbon aerogel has an excellent adsorption effect on various oil pollutants and organic solvents.

Description

technical field [0001] The invention relates to the technical field of oil-water separation, in particular to the preparation of a cellulose carbon airgel and the application of its high hydrophobicity and high adsorption of oil pollutants and organic solvents. Background technique [0002] In recent years, oil spills and organic solvent pollutants have caused severe water pollution, posing serious threats to the environment and human health. Traditional methods to deal with oil pollution mainly include chemical treatment, physical adsorption, bioremediation, and in-situ combustion, among which physical adsorption has the advantages of low cost, high efficiency, and environmental friendliness. So far, porous materials, such as membranes, sponges, aerogels, foams, etc., have received extensive attention in oil-water separation. Compared with other materials, airgel materials have a rich porous structure and are ideal adsorbents, which can effectively adsorb organic pollutant...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/24B01J20/30B01J13/00C10B53/02C10G27/00
CPCB01J20/28047B01J20/24B01J20/20B01J13/0091B01J20/3078C10B53/02C10G25/00C10G2300/201Y02E50/10
Inventor 马祥李文江
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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