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A kind of preparation method and application of emulsion separation membrane with controllable wettability

A technology for emulsion separation and wettability, applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of single separation function, complicated preparation process, poor durability, etc., achieve excellent separation performance, simple preparation method, The effect of low production cost

Active Publication Date: 2021-09-21
NORTHEAST GASOLINEEUM UNIV
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problems of complex preparation process, poor durability, high cost and single separation function of the traditional oil-water separation membrane in the background technology, and provide an emulsion separation membrane with controllable wettability preparation method

Method used

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  • A kind of preparation method and application of emulsion separation membrane with controllable wettability
  • A kind of preparation method and application of emulsion separation membrane with controllable wettability
  • A kind of preparation method and application of emulsion separation membrane with controllable wettability

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Effect test

Embodiment 1

[0025] Embodiment 1: the preparation of emulsion separation membrane

[0026] a) The stainless steel mesh is pretreated, first soaked in acetone, ethanol and distilled water for 20 minutes and ultrasonically cleaned to remove the oxide layer and oil stains on the surface of the stainless steel mesh, and then dried in an oven at 50 °C, the scanning electron microscope image like figure 1 shown.

[0027] b) The pretreated stainless steel mesh is used as the working electrode, the platinum sheet electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode, fixed in the electrolytic cell and fed with a constant current through the electrochemical workstation, and the electrolyte is 0.03 mol / L Cobalt nitrate aqueous solution, the distance between the electrodes is 2 cm. The current density is 30 mA / cm 2 , the temperature of the electrolytic cell was controlled at 20±1°C, and the reaction time was 20 minutes to prepare a stain...

Embodiment 2

[0029] Embodiment 2: performance test of emulsion separation membrane

[0030] (1) Wetting performance test

[0031] Figure 4 This is the photo of the contact angle between the emulsion separation membrane and water in the air, and the contact angle between the emulsion separation membrane and water in the air is close to 0°. Figure 5 This is the photo of the underwater contact angle between the emulsion separation membrane and kerosene. The contact angle is 165°, which is much greater than 150°, and it has achieved super hydrophilic / underwater super oleophobic properties. Image 6 It is a photo of the contact angle of the modified emulsion separation membrane with water, the contact angle is 151°, which has reached the super-hydrophobic state, but the contact angle with kerosene is close to 0° ( Figure 7 ), reaching a superlipophilic state.

[0032] (2) Oil-water separation performance test

[0033] a) Separation performance test of oil-in-water emulsion

[0034] Add ...

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Abstract

The invention relates to a preparation method of an emulsion separation membrane with controllable wettability. It mainly solves the problems of complex preparation process, poor durability, high cost and single separation function of the traditional oil-water separation membrane. The present invention uses cobalt salt as the electrolyte, and self-assembles and deposits multi-layer cobalt hydroxide nanosheets on the surface of stainless steel mesh by electrodeposition technology to obtain an emulsion separation membrane with superhydrophilic / underwater superoleophobic properties, which can separate oil-in-water emulsions . Through the surface modification of fluorosilane, it can be intelligently converted into a superhydrophobic / underwater superoleophilic film to realize the separation of water-in-oil emulsion. The separation efficiency of water-in-oil and oil-in-water emulsions is above 99.5%. The preparation process of the method is simple, the preparation raw materials are cheap and easy to obtain, and it is easy to carry out large-scale production and application. The emulsion separation membrane has high oil-water separation efficiency, corrosion resistance and strong mechanical properties. It is a green, environmentally friendly, economical and applicable new type of emulsion separation membrane, which can be applied to the separation of oil-water mixture and the treatment of oily sewage.

Description

technical field [0001] The invention relates to the technical field of oil-water separation in chemical process, in particular to a preparation method and application of an emulsion separation membrane with controllable wettability. Background technique [0002] With the acceleration of industrialization, the development of petroleum industry, machinery industry, catering industry and marine transportation industry will produce emulsified oil-containing wastewater, which not only causes serious water pollution and ecological damage, but also causes a large amount of oil resource loss. [0003] Under the action of surfactants, the emulsified oil droplets have a particle size between 0.1-10 μm and can be stably dispersed in water for a long time to form a complex emulsified state, which is usually difficult to be destroyed. Traditional oil separation or The air flotation method is difficult to achieve oil-water separation. Therefore, how to effectively treat emulsified oil wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D17/022B01D69/12B01D67/00C25D9/04
CPCB01D17/0202B01D67/0069B01D69/12B01D2325/38C25D9/04
Inventor 袁瑞霞刘金成于鹏
Owner NORTHEAST GASOLINEEUM UNIV
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