An underwater super-oleophobic and sub-oil super-hydrophobic material for oil-water emulsion separation and a solvent-free preparation method thereof

An underwater super-oleophobic and super-hydrophobic technology, applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve the problems of unsatisfactory application fields, poor material stability, complicated preparation process, etc., and achieve solvent resistance retention , The effect of less material usage and simple preparation process

Active Publication Date: 2022-01-28
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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  • An underwater super-oleophobic and sub-oil super-hydrophobic material for oil-water emulsion separation and a solvent-free preparation method thereof
  • An underwater super-oleophobic and sub-oil super-hydrophobic material for oil-water emulsion separation and a solvent-free preparation method thereof

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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 silicon dioxide in the solvent, the ultrasonic time is 10 min, and then the 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 angle of water in n-hexan...

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 silicon dioxide in the solvent, the ultrasonic time is 20 min, and then the 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 contact angle of water in n-h...

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 silicon dioxide in the solvent, the ultrasonic time is 30 min, and then the 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 membrane is 163°, and the contact ...

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Abstract

The invention discloses a solvent-free method for preparing underwater super-oleophobic and sub-oil super-hydrophobic fiber membranes for oil-water emulsion separation. The method is characterized by nano-silica adsorption of Fe 3+ After assembly to the surface of filter paper fibers, polypyrrole was deposited by gas phase polymerization. The obtained filter paper fiber membrane has the functions of super-oleophobic under water (OCA=165°) and super-hydrophobic under oil (OCA=159°), and can separate water-in-oil and oil-in-water microemulsions only under the action of gravity , separation efficiency 99%, flow rate 300L / m 2 / h. The raw materials of the method are cheap and easy to obtain, the preparation conditions are mild, and the gas phase polymerization method not only avoids the use of solvents, but also uses less raw materials. In addition, the material has good durability and can be recycled, which overcomes the disadvantages of the existing filtering demulsification omentum that can only separate one type of oil-water emulsion and has poor stability. The super-lyophobic fiber membrane has broad application prospects in the fields of oil-water separation, especially emulsion separation and oily sewage treatment.

Description

technical field [0001] The invention describes a solvent-free preparation of underwater super-oleophobic and 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 met...

Claims

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Application Information

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Patent Type & Authority Patents(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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