Preparation method of super-hydrophobic cellulose aerogel and application of super-hydrophobic cellulose aerogel in oil stain treatment

A technology of cellulose airgel and cellulose hydrogel, which is applied in the direction of chemical instruments and methods, and other chemical processes, can solve the problems of destroying the modified substrate structure, low modification efficiency, waste of modifiers, etc., and achieves Broad application prospects, high adsorption ratio, and simple process

Inactive Publication Date: 2015-06-17
HAINAN UNIVERSITY +1
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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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  • Preparation method of super-hydrophobic cellulose aerogel and application of super-hydrophobic cellulose aerogel in oil stain treatment
  • Preparation method of super-hydrophobic cellulose aerogel and application of super-hydrophobic cellulose aerogel in oil stain treatment
  • Preparation method of super-hydrophobic cellulose aerogel and application of super-hydrophobic cellulose aerogel in oil stain treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Rinse the cotton linter cellulose with distilled water and absolute ethanol repeatedly, and fully dry it, then take 3% by mass of cellulose and add it to NaOH / urea / water solution precooled at -18°C for 20 minutes (NaOH mass fraction 7 %, mass fraction of urea 12%, water mass percentage 78%). Stir at 750r / min for 10min to obtain a cellulose solution. Then transfer the cellulose solution to the desired mold.

[0037] 2. The configured 17wt.%H 2 SO 4 The solution was dropped into the cellulose solution along the inner wall of the mold, and stood still for 6 hours after the dropping was completed, and the cellulose hydrogel was obtained after complete gelation. Then use distilled water to wash repeatedly to remove residual salt, and a pure cellulose hydrogel can be obtained.

[0038] 3. Freeze the obtained cellulose hydrogel at -18° C. for 24 hours to obtain cellulose jelly, and then freeze-dry to obtain cellulose aerogel. The freeze-drying temperature is -65° C., a...

Embodiment 2

[0042] 1. Rinse the resinous cellulose with distilled water and absolute ethanol repeatedly, and fully dry it, then take 2% by mass of cellulose and add it to -18°C pre-cooled NaOH / urea / water solution (NaOH mass fraction 7%, urea The mass fraction of 12%, water mass percentage 79%). Stir at 750r / min for 10min to obtain a cellulose solution. Then transfer the cellulose solution to the desired mold.

[0043] 2. Drop absolute ethanol into the cellulose solution along the inner wall of the mould, stand still for 6 hours after the addition, and wait for complete gelation to obtain cellulose hydrogel. Then use distilled water to wash repeatedly to remove residual salt, and a pure cellulose hydrogel can be obtained.

[0044] 3. Freeze the obtained cellulose hydrogel at -18° C. for 24 hours to obtain cellulose jelly, and then freeze-dry to obtain cellulose aerogel. The freeze-drying temperature is -80° C., and the pressure is 1 Pa.

[0045] 4. Place the prepared cellulose aerogel ...

Embodiment 3

[0048] 1. Repeatedly rinse waste paper cellulose with distilled water and absolute ethanol, and fully dry it, then take 3% by mass of cellulose and add it to -18°C pre-cooled NaOH / water solution (NaOH mass fraction 8%, water mass fraction percent 89%). Stir at 750r / min for 10min to obtain a cellulose solution. Then transfer the cellulose solution to the desired mold.

[0049] 2. The configured 17wt.%H 2 SO 4 The solution was dropped into the cellulose solution along the inner wall of the mold, and stood still for 6 hours after the dropping was completed, and the cellulose hydrogel was obtained after complete gelation. Then use distilled water to wash repeatedly to remove residual salt, and a pure cellulose hydrogel can be obtained.

[0050] 3. Freeze the obtained cellulose hydrogel at -18° C. for 24 hours to obtain cellulose jelly, and then freeze-dry to obtain cellulose aerogel. The freeze-drying temperature is -65° C., and the pressure is 10 Pa.

[0051] 4. Place the p...

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Abstract

The invention discloses a preparation method of a super-hydrophobic cellulose aerogel and application of the super-hydrophobic cellulose aerogel in oil stain treatment. The light-weight porous cellulose aerogel material is prepared from abundant, renewable and degradable cellulose by using an alkali solution (comprising NaOH solution and NaOH / urea solution) as a solvent system. The minimum density can reach 0.0196 g / cm<3>, and the porosity can reach 99%. Compared with the commercial oil-adsorbing felt material, the cellulose aerogel material has higher adsorbing rate and excellent reusability. The hydrophobic modification method can obtain the super-hydrophobic effect in a quick, effective and energy-saving way, and can implement oil stain collection, oil-water separation and the like in a quick and economical way.

Description

technical field [0001] The invention relates to the field of functional materials, and also belongs to the fields of natural polymers, chemistry and environmental engineering. In particular, it relates to a preparation method of superhydrophobic cellulose airgel and its application in oil pollution treatment. Background technique [0002] With the deterioration of the natural environment, people's daily life has been seriously threatened, and people have gradually realized the importance of environmental governance. Especially for developing countries, the rapid economic growth is driven by the consumption of a large amount of energy such as oil, but most of the energy is at the expense of the environment in the process of transportation and use. The diversity of ecosystems presents serious challenges. For example, in 2008, frequent oil spill accidents such as the Gulf of Mexico oil spill and the Qingdao Port oil spill brought devastating disasters to the local ecological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08J7/12C08J9/28C08J3/075C08L1/02C09K3/32
Inventor 卢凌彬林润俊孟方苗维胜李昂郑婷婷
Owner HAINAN UNIVERSITY
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