Scratch-resistant super-hydrophobic and oleophylic cellulose oil and water adsorption/separation film and preparation method thereof

A cellulose membrane, scratch-resistant technology, applied in separation methods, grease/oily substance/float removal devices, liquid separation, etc., can solve problems such as lack of mechanical scratch stability, modifier waste, methanol discharge, etc. , to achieve the effect of low price, short time consumption and low energy consumption

Active Publication Date: 2017-07-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can be used for underwater oil absorption and oil-water separation, it needs to use large-scale freeze-drying equipment in the process of preparing cellulose airgel, the process is complicated, and it needs to be washed with a large amount of methanol during hydrophobic modification, so that there is a lot of waste in this step. Modifier waste and methanol emissions, in addition, this type of material still lacks mechanical scratch stability (Zhou, S.; Liu, P.; Wang, M.; Zhao, H.; Yang, J.; Xu, F. Sustainable, Reusable, and Superhydrophobic Aerogels from Microfibrillated Cellulose for Highly Effective Oil / Water Separation. ACSSustainable Chem. Eng. 2016, 4, 6409-6416.)

Method used

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  • Scratch-resistant super-hydrophobic and oleophylic cellulose oil and water adsorption/separation film and preparation method thereof
  • Scratch-resistant super-hydrophobic and oleophylic cellulose oil and water adsorption/separation film and preparation method thereof
  • Scratch-resistant super-hydrophobic and oleophylic cellulose oil and water adsorption/separation film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add ammonia solution with a mass fraction of 20% to 0.05mol / L zinc nitrate solution and stir to form a mixed solution, so that the molar ratio of zinc atoms to nitrogen atoms is 1:4, then put it into a cellulose membrane and react at 80°C for 4 hours, and the reaction is over Finally, take out the cellulose film and rinse it with deionized water, and dry it under vacuum at 40°C; soak the obtained cellulose film in 0.01mol / L stearic acid ethanol solution at 25°C for 6h, wash it with ethanol after the reaction, and dry it at 40°C °C and vacuum dried.

[0035] The contact angle of the prepared film with water in air is greater than 150°, the water rolling angle is less than 10°, and the contact angle of the prepared film with oil in air is 0°, showing super lipophilicity. After the film is scraped ten times by the blade, its water contact angle is greater than 150°, and its water rolling angle is less than 10°.

Embodiment 2

[0037] Add ammonia solution with a mass fraction of 35% to 0.1mol / L zinc acetate solution and stir to form a mixed solution, so that the molar ratio of zinc atoms to nitrogen atoms is 1:1, then put it into a cellulose film and react at 100°C for 2 hours, and the reaction is over. Finally, take out the cellulose film and rinse it with deionized water, and dry it in vacuum at 40°C; soak the obtained cellulose film in 0.25mol / L stearic acid ethanol solution at 50°C for 1h, wash it with ethanol after the reaction, and dry it at 40°C °C and vacuum dried.

[0038] The contact angle of the prepared film with water in air is greater than 150°, the water rolling angle is less than 10°, and the contact angle of the prepared film with oil in air is 0°, showing super lipophilicity. After the film is scraped ten times by the blade, its water contact angle is greater than 150°, and its water rolling angle is less than 10°.

Embodiment 3

[0040] Add ammonia solution with a mass fraction of 28% in 0.2mol / L zinc sulfate solution and stir to form a mixed solution, so that the molar ratio of zinc atoms to nitrogen atoms is 1:20, then put it into a cellulose film and react at 120°C for 3 hours, and the reaction is over Finally, take out the cellulose film and rinse it with deionized water, and dry it in vacuum at 40°C; soak the obtained cellulose film in 0.5mol / L stearic acid ethanol solution at 35°C for 2h, wash it with ethanol after the reaction, and dry it at 40°C °C and vacuum dried.

[0041] The contact angle of the prepared film with water in air is greater than 150°, the water rolling angle is less than 10°, and the contact angle of the prepared film with oil in air is 0°, showing super lipophilicity. After the film is scraped ten times by the blade, its water contact angle is greater than 150°, and its water rolling angle is less than 10°.

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Abstract

The invention discloses a scratch-resistant super-hydrophobic and oleophylic cellulose oil and water adsorption/separation film and a preparation method thereof. The scratch-resistant super-hydrophobic and oleophylic cellulose oil and water adsorption/separation film consists of a cellulose film and a metal oxide, wherein the metal oxide is grown at the surface of the film in an in-situ way after the surface is treated by a stearic acid ethanol solution; the contact angle with water in air is greater than 150 degrees, the rolling angle is smaller than 10 degrees, and the contact angle with oil in water air is 0 degree; after scratching by a knife blade for ten times, the contact angle with water is still greater than 150 degrees, and the rolling angle is still smaller than 10 degrees. The scratch-resistant super-hydrophobic and oleophylic cellulose oil and water adsorption/separation film has the advantages that the high scratch-resistant, super-hydrophobic and oleophylic properties are realized; the preparation technology is simple, the energy consumption is low, the consumption time is short, the complicated equipment or inert atmosphere is not needed, the amount of used material and reagent is small, and the toxic or side effect is little; the pollution matters of organic fluorine, organic phosphor, organic silicon and the like are not produced in the reaction treatment process, the pollution to environment is little, and the large-scale production and preparation is realized.

Description

technical field [0001] The invention belongs to the technical field of hydrophobic and lipophilic membrane materials and their preparation, and in particular relates to a scratch-resistant superhydrophobic and lipophilic cellulose oil-water adsorption / separation membrane and a preparation method thereof. Background technique [0002] With the improvement of people's living standards, the demand for chemical products is also increasing. Although this has promoted the rapid development of the chemical industry, at the same time, the environmental pollution caused by the leakage of chemical raw materials has become increasingly prominent, especially halogenated hydrocarbons, etc. A variety of organic solvents (heavy oils), which are denser than water, enter the rivers and are located in the lower layer of the water body, which is difficult to remove through natural volatilization, causing serious water pollution. At present, the treatment of heavy oil-containing wastewater main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D69/02B01D67/00C02F1/44C02F1/40B01D17/022
Inventor 王玉忠徐昌连宋飞汪秀丽
Owner SICHUAN UNIV
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