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Superhydrophilic-underwater superoleophobic modified separation membrane, its preparation method and application

An underwater super-oleophobic and super-hydrophilic technology, applied in oil-water separation membranes and oil-water separation applications, can solve the problem of water flux decline and other issues

Active Publication Date: 2021-09-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most polymer membranes are hydrophobic, even highly hydrophobic, and the resulting hydrophobic membrane will strongly adsorb emulsified oil, resulting in a sharp drop in water flux.

Method used

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  • Superhydrophilic-underwater superoleophobic modified separation membrane, its preparation method and application
  • Superhydrophilic-underwater superoleophobic modified separation membrane, its preparation method and application
  • Superhydrophilic-underwater superoleophobic modified separation membrane, its preparation method and application

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preparation example Construction

[0022] One aspect of the embodiments of the present invention provides a method for preparing a superhydrophilic-underwater superoleophobic modified separation membrane, which includes:

[0023] Disperse graphene oxide and one-dimensional single-walled aluminosilicate nanotubes in deionized water to form a mixed dispersion;

[0024] The graphene oxide and one-dimensional single-wall aluminosilicate nanotubes in the mixed dispersion liquid are deposited on the surface of the polymer microfiltration membrane, and after drying, a modified separation membrane of superhydrophilic-underwater superoleophobic is obtained.

[0025] In some embodiments, the preparation method includes: adding graphene oxide and one-dimensional single-walled aluminosilicate nanotubes into deionized water, and then ultrasonicating for 20 to 60 minutes to form the mixed dispersion;

[0026] In some embodiments, the preparation method includes: using vacuum filtration to deposit graphene oxide and one-dimen...

Embodiment 1

[0043] Embodiment 1 A kind of preparation method of superhydrophilic-underwater superoleophobic modified nylon membrane can be carried out according to the following steps:

[0044] (1) Add 0.1 mg of graphene oxide and 1.0 mg of one-dimensional single-walled aluminosilicate nanotubes into 30 mL of deionized water, and ultrasonically disperse for 30 minutes;

[0045] (2) By vacuum filtration, the mixed dispersion obtained in step (1) is deposited on the surface of the nylon microfiltration membrane by suction filtration, and dried to obtain a superhydrophilic-underwater superoleophobic modified nylon membrane.

[0046] The water contact angle of the modified nylon membrane that present embodiment obtains is 0 ° (see figure 1 ), it was placed under water to measure the contact angle of this film with 1 microliter of methylene chloride to be about 153° (see figure 2 ).

[0047] use as Figure 5 The experimental device shown is used for the oil-water separation test of the mod...

Embodiment 2

[0049] Embodiment 2 A kind of preparation method of superhydrophilic-underwater superoleophobic modified mixed cellulose membrane can be carried out according to the following steps:

[0050] (1) Add 0.1 mg of graphene oxide and 2 mg of one-dimensional single-walled aluminosilicate nanotubes into 30 mL of deionized water, and ultrasonically disperse for 40 minutes;

[0051] (2) Then, by vacuum filtration, the mixed dispersion liquid obtained in step (1) is deposited onto the surface of the mixed cellulose microfiltration membrane by suction filtration, and dried to obtain a super-hydrophilic-underwater super-oleophobic modification Mixed cellulose membrane.

[0052] The water contact angle of the modified mixed cellulose that the present embodiment obtains is 0 °, and it is placed under water to measure this film and the contact angle of 1 microliter of toluene is about 153 ° (see image 3 ).

[0053] use as Figure 5 The experimental device shown is used for the oil-water se...

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Abstract

The invention discloses a superhydrophilic-underwater superoleophobic modified separation membrane, its preparation method and application. The preparation method comprises: dispersing graphene oxide and one-dimensional single-walled aluminosilicate nanotubes in deionized water to form a mixed dispersion; and making the graphene oxide, one-dimensional single-walled aluminum-silicon The acid nanotubes are deposited on the surface of the polymer microfiltration membrane, and after drying, a modified separation membrane with superhydrophilic-underwater superoleophobicity is obtained. The modified separation membrane of the present invention has superhydrophilicity and underwater superoleophobicity, good stability, high oil-water separation efficiency, and can effectively separate oil-water emulsion. At the same time, its preparation process is simple, safe and environmentally friendly, and low in price, and can realize Large-scale preparation has good industrial application prospects.

Description

technical field [0001] The invention relates to an oil-water separation membrane, in particular to a superhydrophilic-underwater superoleophobic modified separation membrane, its preparation method and application, such as its application in oil-water separation, and belongs to the field of functional materials. Background technique [0002] With the rapid development of industry and the acceleration of urbanization, wastewater containing a large amount of pollutants is discharged into the environment, which will damage the ecological environment and threaten human health. Among these contaminants, emulsified oils are particularly difficult to deal with. Traditional gravity separation, ultrasonic separation, air flotation, centrifugation, coagulation, biological treatment and other methods are limited due to low separation efficiency and large secondary pollution. It is urgent to develop an efficient, energy-saving and economical emulsified oil separation method. [0003] M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02C02F1/44B01D17/022
CPCB01D17/0202B01D67/0079B01D69/02B01D2325/36C02F1/444
Inventor 顾林曾志翔张哲鹏
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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