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High-flux super-hydrophilic/underwater super-oleophobic Janus membrane modification method

An underwater superoleophobic and superhydrophilic technology, applied in the chemical industry, can solve problems such as wetting, and achieve the effects of improving toughness, reducing energy consumption, and being easy to operate and control.

Pending Publication Date: 2021-07-23
BEIJING FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the problem that the hydrophobic nature of membrane materials in the current membrane distillation process section is easy to be wetted by non-polar pollutants such as oil when treating oily wastewater, by constructing a hydrophilic and oleophobic porous network on one side of the membrane, This kind of Janus membrane can be applied to the process conditions of oily wastewater treatment, prolonging the service life of membrane components

Method used

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  • High-flux super-hydrophilic/underwater super-oleophobic Janus membrane modification method
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  • High-flux super-hydrophilic/underwater super-oleophobic Janus membrane modification method

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Experimental program
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Effect test

Embodiment 1

[0044] S1. Dissolve the hydrophilic carbon nanotubes in 5ml of absolute ethanol solution, sonicate for 60 minutes to disperse the material evenly, and prepare a carbon nanotube-ethanol suspension with a certain concentration;

[0045] S2. Immerse the PVDF flat film in an ethanol solution, treat it with ultrasonic waves for 10 minutes, and place the loaded film in a constant temperature drying oven at 80°C for 24 hours;

[0046] S3. Use a vacuum pump to load 5 mL of the carbon nanotube-ethanol suspension prepared by S1 on the PVDF flat film of S2 under a negative pressure environment with a vacuum degree of 0.05-0.10 MPa. The deposition temperature is 25 ° C. The time is 60 minutes, the rotor speed is 400r / min, and then dried in a constant temperature drying oven at 60°C for 6 hours;

[0047] S4. Immerse the film material of S3 in the tris 8.5 solution of 2mg / L dopamine solution and 6mg / L polyethyleneimine solution at a constant temperature of 25°C, co-deposit at 400r / min for 6...

Embodiment 2

[0049] S1. Dissolve the hydrophilic carbon nanotubes in 5ml of absolute ethanol solution, sonicate for 60 minutes to disperse the material evenly, and prepare a carbon nanotube-ethanol suspension with a certain concentration;

[0050] S2. Immerse the PVDF flat film in an ethanol solution, treat it with ultrasonic waves for 10 minutes, and place the loaded film in a constant temperature drying oven at 80°C for 24 hours;

[0051] S3. Use a vacuum pump to load 5 mL of the carbon nanotube-ethanol suspension prepared by S1 on the PVDF flat film of S2 under a negative pressure environment with a vacuum degree of 0.05-0.10 MPa. The deposition temperature is 25 ° C. The time is 60 minutes, the rotor speed is 400r / min, and then dried in a constant temperature drying oven at 60°C for 6 hours;

[0052] S4. Immerse the film material of S3 in the tris 8.5 solution of 2mg / L dopamine solution and 6mg / L polyethyleneimine solution at a constant temperature of 25°C, co-deposit at 400r / min for 1...

Embodiment 3

[0055] S1. Dissolve the hydrophilic carbon nanotubes in 5ml of absolute ethanol solution, sonicate for 60 minutes to disperse the material evenly, and prepare a carbon nanotube-ethanol suspension with a certain concentration;

[0056] S2. Immerse the PVDF flat film in an ethanol solution, treat it with ultrasonic waves for 10 minutes, and place the loaded film in a constant temperature drying oven at 80°C for 24 hours;

[0057] S3. Use a vacuum pump to load 5 mL of the carbon nanotube-ethanol suspension prepared by S1 on the PVDF flat film of S2 under a negative pressure environment with a vacuum degree of 0.05-0.10 MPa. The deposition temperature is 25 ° C. The time is 60 minutes, the rotor speed is 400r / min, and then dried in a constant temperature drying oven at 60°C for 6 hours;

[0058] S4. Immerse the film material of S3 in the tris 8.5 solution of 2mg / L dopamine solution and 6mg / L polyethyleneimine solution at a constant temperature of 25°C, co-deposit at 400r / min for 2...

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Abstract

The invention relates to a high-flux super-hydrophilic / underwater super-oleophobic Janus membrane modification method, which is characterized in that a dopamine and polyethyleneimine co-deposition technology is adopted to coat a hydrophilic carbon nanotube on the surface of one side of a hydrophobic membrane, and a stable hydrophilic carbon nanotube coating is synthesized, so that one side of the membrane keeps the original characteristics, and the other side of the membrane has excellent super-hydrophilic / underwater super-oleophobic characteristics; the membrane flux is increased, and the oil pollution resistance of the membrane is improved; a synthesis method comprises the following steps: coating the surface of the membrane with a carbon nano tube ethanol solution in a negative pressure vacuum manner, and then stably fixing the coated carbon nano tube in a dopamine and polyethyleneimine codeposition manner, so that the obtained modified Janus membrane has the pore diameter of 0.2-0.25 [mu]m, the water contact angle of 9 degrees and the oil contact angle of 180 degrees, and the membrane has extremely high hydrophilicity and super-oleophobic characteristics. The method is simple and efficient, and the prepared super-hydrophilic / underwater super-oleophobic janus membrane is high in flux and resistant to oil pollution.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a high-flux, superhydrophilic / underwater superoleophobic Janus membrane modification technology suitable for hydrophobic polyvinylidene fluoride (PVDF) membranes. Background technique [0002] In the process of water treatment, membrane distillation is a new heat-driven separation process with high efficiency and energy saving. In the process of membrane separation, various forms of low-quality heat sources such as solar energy and geothermal heat can be used to heat the feed solution. In a typical membrane separation process, a hydrophobic porous membrane is used as a medium to separate hot and cold materials. Although hot liquid is not allowed to enter, water vapor is allowed to enter through the membrane pores. Due to the difference in vapor pressure on both sides of the membrane caused by the temperature difference, water vapor is driven from the feed si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D67/00B01D69/02B01D69/06B01D71/26B01D71/34B01D71/36
CPCB01D71/34B01D69/02B01D61/364B01D67/0093B01D69/06B01D71/36B01D71/26B01D67/0095B01D2325/36
Inventor 贠延滨李棒李萌鄞铃
Owner BEIJING FORESTRY UNIVERSITY
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