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Super-hydrophilic and underwater super-oleophobic oil-water separation mesh membrane having, and its preparation method

An oil-water separation membrane and underwater super-oleophobic technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve problems such as complex processes, achieve good separation effect, good stability, and oil-water separation good effect

Inactive Publication Date: 2013-03-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent application with the application number 201010531517.5 discloses an oil-water separation network with underwater super-oleophobic properties. Although this technology has the effect of oil-water separation, it needs light-induced polymerization in the preparation method and has the disadvantage of complex process.

Method used

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  • Super-hydrophilic and underwater super-oleophobic oil-water separation mesh membrane having, and its preparation method
  • Super-hydrophilic and underwater super-oleophobic oil-water separation mesh membrane having, and its preparation method
  • Super-hydrophilic and underwater super-oleophobic oil-water separation mesh membrane having, and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, prepare superhydrophilic and underwater superoleophobic oil-water separation omentum

[0028] (1) Soak the 400-mesh copper net in ethanol and acetone for 15 minutes, and then dry it;

[0029] (2) At room temperature, add 100ml of water, 4.0g of sodium hydroxide and 1.35g of potassium persulfate into a 250ml beaker, stir well to obtain a mixed solution, the molar concentration of sodium hydroxide in the mixed solution is 1.0mol / L, The molar concentration of potassium persulfate is 0.05mol / L;

[0030] (3) Immerse all the copper mesh obtained in step (1) into the mixed solution obtained in step (2);

[0031] (4) Wash it with water after 0.5 hours of oxidation reaction, and form a uniform micron and nanocomposite structure on the wire of the copper mesh (such as Figure 1a As shown), there are countless nanoneedles with a length of 6-10 microns and a diameter of 200-550 nm distributed on the mesh (such as Figure 1c shown) and crystals with a diameter of 5-1...

Embodiment 2

[0034] Embodiment 2, prepare superhydrophilic and underwater superoleophobic oil-water separation omentum

[0035] (1) Dip the 200-mesh brass mesh into ethanol and acetone and ultrasonically clean it for 15 minutes, then dry it;

[0036] (2) At room temperature, add 100ml of water, 8.0g of sodium hydroxide and 2.28g of ammonium persulfate into a 250ml beaker, stir well to obtain a mixed solution, the molar concentration of sodium hydroxide in the mixed solution is 2.0mol / L, The molar concentration of ammonium persulfate is 0.10mol / L;

[0037] (3) Immerse all the brass mesh obtained in step (1) into the mixed solution obtained in step (2);

[0038] (4) Wash it with water after 0.25 hours of oxidation reaction, and form a uniform micron and nanocomposite structure on the mesh of the brass mesh. Numerous nanometers with a length of 5 to 7 microns and a diameter of 100 to 400 nanometers are distributed on the mesh. Crystals with a diameter of 1-5 microns coated on the needles an...

Embodiment 3

[0041] Embodiment 3, prepare superhydrophilic and underwater superoleophobic oil-water separation omentum

[0042] (1) Soak the 300-mesh phosphor copper mesh in ethanol and acetone for 15 minutes, and then dry it;

[0043] (2) At room temperature, add 100ml of water, 16.8g of potassium hydroxide and 3.57g of sodium persulfate into a 250ml beaker, stir well to obtain a mixed solution, the molar concentration of potassium hydroxide in the mixed solution is 3.0mol / L, The molar concentration of sodium persulfate is 0.15mol / L;

[0044] (3) Immerse all the phosphor copper mesh obtained in step (1) into the mixed solution obtained in step (2);

[0045] (4) Wash it with water after 1.0 hours of oxidation reaction, and form a uniform micron and nanocomposite structure on the mesh of the phosphor copper mesh. Numerous nanometers with a length of 6 to 10 microns and a diameter of 100 to 500 nanometers are distributed on the mesh. Crystals with a diameter of 1-10 microns coated on the n...

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Abstract

The invention discloses a super-hydrophilic and underwater super-oleophobic oil-water separation mesh membrane, and its preparation method. The method comprises the following steps: 1, cleaning a copper mesh, and airing; 2, dissolving an alkaline medium and an oxidant in water, and uniformly stirring to obtain a mixed solution; and 3, dipping the aired copper mesh in the mixed solution, and carrying out an oxidation reaction to obtain the oil-water separation mesh membrane. The oil-water separation mesh membrane has the advantages of easily available raw material, low cost, simple equipment and making technology, realization of large-scale preparation, large water flux, fast water-water separation speed, good oil-water separation effect, suitableness for the treatment of sewage containing a large amount of water, very good separation effect on n-hexane, petroleum ether, dichloroethane, benzene, gasoline, diesel oil, kerosene, machine oil, crude oil, animal and plant oil, and the like, easy cleaning, repeatable use, and good stability.

Description

technical field [0001] The invention relates to a superhydrophilic and underwater superoleophobic oil-water separation mesh and a preparation method thereof, belonging to the field of surface modification of solid materials. Background technique [0002] Wettability (also known as wettability) is an important characteristic of solid surfaces. In recent years, with the rapid development of nanotechnology, the special wettability of solid surfaces, such as superhydrophobic, superhydrophilic, superoleophobic, and superlipophilic, has aroused great interest in the research field. The oil-water separation technology developed through multiple combinations has become an important issue to solve people's production and life, economic development and environmental safety. [0003] However, most of the work is based on the ubiquitous solid / liquid / gas (mostly refers to the air) three-phase wetting, so as to prepare oil-water separation mesh or oil-water separation mesh with superhydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00
Inventor 冯琳刘娜危岩
Owner TSINGHUA UNIV
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