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Preparation method of super-hydrophobic-super-oleophylic straw felt for oil-water separation

An oil-water separation and superhydrophobic technology, which is applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve the problems of easy to disperse superhydrophobic-superoleophilic straw fibers, superhydrophobic-superlipophilic failure, high price of silane, etc. problem, to achieve the effect of low raw material cost, low cost, and high-efficiency oil-water separation

Active Publication Date: 2020-12-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method is difficult to be applied in practice due to the following reasons: (1) Although the rough structure required for superhydrophobicity-superoleophilicity can be effectively constructed by relying on the attachment of nanoparticles, the structure is easily peeled off in actual use, resulting in superhydrophobicity-superlipophilicity. Ineffectiveness of lipophilicity; (2) The price of silane is high, and the cost is high when used in large quantities; (3) It is easy to disperse super-hydrophobic-super-oleophilic straw fibers under wind and wave conditions, and it is not easy to collect after dispersing, which will cause secondary pollution instead

Method used

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  • Preparation method of super-hydrophobic-super-oleophylic straw felt for oil-water separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Take a few straw straws, cut them to a length of 10 mm, then soak them in an aqueous sodium hydroxide solution with a temperature of 80° C. and a mass fraction of 10% for 50 minutes. During the soaking process, the stirring speed is 600 r / min, and then pull them out. And rinse with water until neutral;

[0018] (2) pressing the treated rice straw into a round cake-shaped mold, drying and forming at 60°C;

[0019] (3) Mix stearyl chloride and 1,4-anhydrous dioxane at a volume ratio of 1:20 to form a low surface energy solution, then soak the molded straw into the low surface energy solution for 30 minutes, and then remove out, and dried at 80°C, the straw obtained after drying was in the shape of a round cake, the contact angle to water was 155±1.8°, and the contact angle to oil was 0°, such as figure 1 shown.

[0020] (4) Put the straw treated with low surface energy into a round cake-shaped elastic porous cotton packaging bag with a pore size of 100 μm to obtain ...

Embodiment 2

[0022] (1) Take a few straw straws, cut them to a length of 30 mm, then soak them in an aqueous sodium hydroxide solution with a temperature of 80° C. and a mass fraction of 15% for 20 minutes. During the soaking process, the stirring speed is 500 r / min, and then pull them out. And rinse with water until neutral;

[0023] (2) pressing the treated rice straw into a cylindrical mold, drying and molding at 50°C;

[0024] (3) Mix stearyl chloride and 1,4-anhydrous dioxane at a volume ratio of 1:10 to form a low surface energy solution, then soak the molded straw into the low surface energy solution for 30 minutes, and then remove out, and dried at 70°C, the straw obtained after drying was cylindrical, the contact angle to water was 156±1.2°, and the contact angle to oil was 0°.

[0025] (4) Put the straw treated with low surface energy into a cylindrical elastic porous cotton packaging bag with a pore size of 200 μm to obtain a superhydrophobic-superoleophilic straw felt.

Embodiment 3

[0027] (1) Take a few straw straws, cut them to a length of 20 mm, then soak them in an aqueous sodium hydroxide solution with a temperature of 80° C. and a mass fraction of 12% for 40 minutes. During the soaking process, the stirring speed is 800 r / min, and then pull them out. And rinse with water until neutral;

[0028] (2) pressing the treated rice straw into a square mold, drying and molding at 40°C;

[0029] (3) Mix stearyl chloride and 1,4-anhydrous dioxane at a volume ratio of 1:5 to form a low surface energy solution, then soak the molded straw into the low surface energy solution for 20 minutes, and then remove out, and dried at 60°C, the straw obtained after drying was in the shape of a square, the contact angle to water was 154±0.9°, and the contact angle to oil was 0°.

[0030] (4) Put the low surface energy treated straw into a square-shaped elastic porous cotton packaging bag with a pore size of 300 μm to obtain a superhydrophobic-superoleophilic straw felt.

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Abstract

The invention discloses a preparation method of a super-hydrophobic super-oleophylic straw felt for oil-water separation. The method mainly comprises the following steps: 1, cutting straw stalks to aspecific length, soaking in a sodium hydroxide aqueous solution for treatment, fishing out, and washing with water to neutrality; 2, pressing the mixture into a mold with a specific shape, drying andmolding; 3, taking stearoyl chloride as a solute, taking 1,4- anhydrous dioxane as a solvent, mixing to form a low-surface-energy solution, soaking the formed straw into the solution for low-surface-energy treatment, taking out, and drying; and 4, putting the straw subjected to low surface energy treatment into an elastic porous cotton packaging bag which is consistent with the straw in shape to form the super-hydrophobic super-oleophylic straw felt. The product is low in cost, high in strength and not prone to being scattered by stormy waves, and has good application prospects in the fields of marine spilled oil cleaning, industrial wastewater treatment and the like.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophobic-superoleophilic rice straw mat which can be used for oil-water separation. Background technique [0002] The discharge of industrial oily wastewater and oil spill accidents during oil exploitation and transportation often cause ecological pollution and cause serious economic losses. Commercial polymer oil-absorbing felts are often used to clean up and contain oil spills due to their cleanliness and lightness. However, these polymer oil-absorbing felts have disadvantages such as low adsorption capacity, poor selectivity (in addition to oil and water absorption), and difficulty in repeated use. In recent years, superhydrophobic-superoleophilic oil-absorbing materials that only absorb oil but not water have received more and more attention. Patent CN105107468A absorbs octyltriethoxysilane-modified nano-zinc oxide particles onto straw fibers covered with silica particles to prepare superh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022
CPCB01D17/02
Inventor 宋金龙刘吉宇
Owner DALIAN UNIV OF TECH
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