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Material with super-oleophobicity under water and super-hydrophobicity under oil for oil-water emulsion separation and solvent-free preparation method thereof

An underwater superoleophobic and superhydrophobic technology, which is applied in separation methods, liquid separation, grease/oily substance/floating matter removal devices, etc., can solve problems such as inability to meet application fields, harsh preparation conditions, and complex preparation processes. Achieve the effect of retaining solvent resistance, simple preparation process, and overcoming a single species

Active Publication Date: 2019-09-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the above-mentioned materials to have both underwater super-oleophobic and super-hydrophobic properties under oil, so it is difficult to separate the water-in-oil emulsion and the oil-in-water emulsion at the same time, usually need to be pretreated before use, and the stability of the material is relatively poor , it is difficult to recycle; in addition, the preparation process of the material is complicated, requires special equipment, and the preparation conditions are harsh. VOCs are usually used as solvents and harmful substances, which is time-consuming and expensive, does not conform to the current concept of green chemistry, and is far from meeting its broad Application field

Method used

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  • Material with super-oleophobicity under water and super-hydrophobicity under oil for oil-water emulsion separation and solvent-free preparation method thereof
  • Material with super-oleophobicity under water and super-hydrophobicity under oil for oil-water emulsion separation and solvent-free preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Silica 0.15g

[0023] FeCl 3 0.81 grams

[0024] Ethanol / water 7 / 14 mL

[0025] Soaking times 4 times

[0026] Drying temperature 50℃

[0027] Pyrrole monomer 0.08 mL

[0028] Vapor deposition time 6 h

[0029] Vapor deposition temperature 35°C

[0030] Weigh each component according to the ratio described in the present invention, first disperse the nano-silica in the solvent, the over-generation time is 10min, and then under the condition of 800 r / min, FeCl 3 Add to the above mixture and stir for 10 min to form a silica dispersion containing oxidant. Then soak the filter paper with a pore size of 1-3 microns in the above solution for 30 minutes, take it out, and dry it at 50°C, repeating this process 4 times. Finally, the treated filter paper is placed in a closed container containing pyrrole monomer for gas-phase polymerization, washed with deionized water and dried. The contact angle of dichloromethane in the obtained sample water is 160°, and the contact ...

Embodiment 2

[0032] Silicon dioxide 0.20 g

[0033] FeCl 3 0.81 grams

[0034] Ethanol / water 7 / 14 mL

[0035] Soaking times 3 times

[0036] Drying temperature 50°C

[0037] Pyrrole monomer 0.10 mL

[0038] Vapor deposition time 4 h

[0039] Vapor deposition temperature 40 °C

[0040] Weigh each component according to the ratio described in the present invention, first disperse the nano-silica in the solvent, the over-generation time is 20min, and then under the condition of 1000 r / min, FeCl 3 Add to the above mixture and stir for 10 min to form a silica dispersion containing oxidant. Then soak the filter paper with a pore size of 30-50 microns in the above solution for 20 min, take it out, and dry it at 50 °C, repeating this process 3 times. Finally, the treated filter paper is placed in a closed container containing pyrrole monomer for gas-phase polymerization, washed with deionized water and dried. The underwater toluene contact angle of the obtained sample was 163°, and the con...

Embodiment 3

[0042] Silicon dioxide 0.60 g

[0043] FeCl 3 1.62 grams

[0044] Ethanol / water 30 / 60 mL

[0045] Soaking times 7 times

[0046] Drying temperature 50℃

[0047] Pyrrole monomer 0.15 mL

[0048] Vapor deposition time 6 h

[0049] Vapor deposition temperature 40°C

[0050] Weigh each component according to the ratio described in the present invention, first disperse the nano-silica in the solvent, the super-generation time is 30min, and then under the condition of 1200 r / min, FeCl 3 Add to the above mixture and stir for 10 min to form a silica dispersion containing oxidant. Then soak the filter paper with a pore size of 30-50 microns in the above solution for 20 min, take it out, and dry it at 50 °C, repeating this process 7 times. Finally, the treated filter paper is placed in a closed container containing pyrrole monomer for gas-phase polymerization, washed with deionized water and dried. The underwater toluene contact angle of the obtained filter paper fiber membran...

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Abstract

The invention discloses a fibrous membrane with super-oleophobicity under water and super-hydrophobicity under oil for oil-water emulsion separation prepared by a solvent-free method. The method is characterized in that nano silica adsorbs Fe<3+> and then is assembled onto the surface of filter paper fibers, and then polypyrrole is deposited by gaseous polymerization. The obtained filter paper fibrous membrane has the functions of super-oleophobicity (OCA=165 degrees) under water and super-hydrophobicity (OCA=159 degrees) under oil, water-in-oil and oil-in-water microemulsions can be separated only under the action of gravity, the separation efficiency is 99%, and the flow rate is 300 L / m<2> / h. The method has the advantages that raw materials are cheap and easy to obtain, the preparation conditions are mild, and the gaseous polymerization not only avoids the use of solvent, but also uses fewer raw materials. In addition, the material is good in durability and can be recycled; the disadvantages that an existing filtered demulsification net membrane can only separate one type of oil-water emulsion and is poor in stability are overcome. The super-lyophobic fibrous membrane has broad application prospects in the fields of oil-water separation, especially emulsion separation, oil-containing sewage treatment and the like.

Description

technical field [0001] The invention describes a solvent-free preparation of underwater super-oleophobic / sub-oil super-hydrophobic fiber membranes for oil-water emulsion separation, which belongs to the technical field of functional materials. Background technique [0002] With the exploitation of offshore oil and the leakage of oil products during oil transportation, marine ecological disasters are caused, and a large amount of oily wastewater is produced in the process of industrial production, which not only leads to energy waste, but also causes great harm to human health and the ecological environment. , oil-water separation has become a global problem of widespread concern. Compared with the phase-separated oil-water mixture, the emulsified oil-water mixture has a small particle size (< 20 μm), the oil-water interface is stable, and it is difficult to coalesce, so it is difficult to effectively separate through the traditional gravity method. Milk and other methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022C02F1/40
CPCB01D17/0202C02F1/40
Inventor 李永严仕伟王珺宋浩杰贾晓华
Owner SHAANXI UNIV OF SCI & TECH
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