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A kind of superhydrophobic superoleophilic nanofibrous membrane and preparation method thereof for oil-water mixture separation

A technology of nanofiber membrane and oil-water mixture, which is applied in separation methods, liquid separation, semi-permeable membrane separation, etc., to achieve the effect of improving the performance of oil-water separation

Active Publication Date: 2021-10-08
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When treating sewage, it is inevitable to encounter some harsh environments, such as strong acid, strong alkali, high temperature and other environments, but the existing fiber separation membranes are difficult to use normally in these harsh and extreme conditions

Method used

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  • A kind of superhydrophobic superoleophilic nanofibrous membrane and preparation method thereof for oil-water mixture separation
  • A kind of superhydrophobic superoleophilic nanofibrous membrane and preparation method thereof for oil-water mixture separation
  • A kind of superhydrophobic superoleophilic nanofibrous membrane and preparation method thereof for oil-water mixture separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the dry four-necked flask (mainly including mechanical stirrer, thermometer, N 2 Add 0.01 mol of BPDA and 0.01 mol of PDA to the tube) and mix evenly. Under vigorous mechanical stirring, 40ml of DMAc was added. Nitrogen gas was introduced to keep the ambient temperature at -5°C. After 12 hours of reaction, when the rod climbing phenomenon occurred, the reaction was terminated by exposing the reaction to air to obtain a PAA solution.

[0035] In order to obtain a polyimide (PI) film, it is first necessary to obtain a PAA film. The PAA solution was spun in a high-voltage electrostatic field with a voltage of 25kV (+15, -10kV). The distance from the needle tip to the flywheel was about 15cm. The electrospinning speed was 1mL / h, and it was collected with a grounded flywheel at a speed of 2000 rpm. PAA nanofibers. The polyamic acid fiber membrane (PAA film) obtained by electrospinning was heated to 150°C for 1h at a heating rate of 1°C / min, then heated to 200°C for 1h,...

Embodiment 2

[0037] (1) Cut the PI film into a sample of 2cm×2cm.

[0038] (2) Prepare polydimethylsiloxane (PDMS) solutions with five different concentrations (0.1wt%, 0.5wt%, 1wt%, 2wt%, 4wt%).

[0039] (3) After soaking the PI film sample in the PDMS solution for 2 hours, place it in a vacuum drying oven at 80° C. for 2 hours to obtain a PDMS / PI film.

[0040](4) Silica nanoparticle suspensions (SNPs) with five different concentrations (0.1wt%, 0.5wt%, 1wt%, 2wt%, 4wt%) were prepared.

[0041] (5) Place the PDMS / PI film in the SNPs suspension for 2 hours, and then place it in a vacuum oven at 80°C for 2 hours to obtain the PDMS-SNPs / PI film. The whole process is as follows: figure 1 shown.

Embodiment 3

[0043] Using a field emission scanning electron microscope (S-4800, Japan Hitachi Electronics Co.), observe the surface morphology of the PDMS / PI film and PDMS-SNPs / PI film prepared in Example 2, which confirms that the film material prepared by the present invention has nano-roughness structure. The field emission scanning electron microscope used this time has the function of analyzing elements, and the elements on the surface of the membrane are confirmed through the equipped EDS analysis, which confirms the successful modification of the membrane, such as figure 2 shown.

[0044] Adopt Nicolet 360FT-IR spectrometer to identify respectively the PI film that embodiment 1 prepares, the PDMS / PI film that embodiment 2 prepares, PDMS-SNPs / PI film functional group and film structure property, as image 3 as shown in a. One of the adsorption peaks of PI fiber is 1771cm -1 , can be attributed to the stretching vibration of the -CONH functional group, which proves that the imidi...

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Abstract

The invention discloses a superhydrophobic and superoleophilic nanofiber membrane used for the separation of oil-water mixtures and a preparation method thereof. Biphenyltetracarboxylic dianhydride and p-phenylenediamine are dissolved in N,N-dimethylformamide, React for 12 to 24 hours in a nitrogen atmosphere at -10 to -5°C to synthesize a polyamic acid solution; dissolve biphenyltetracarboxylic dianhydride and p-phenylenediamine in N,N-dimethylformamide, Synthesize the polyamic acid solution by reacting for 12-24 hours under nitrogen atmosphere at 5°C; the polyamic acid solution is prepared into a polyamic acid nanofiber membrane, and then the temperature is raised to imidize the polyamic acid nanofiber membrane to obtain a polyimide nanofiber membrane; finally The polyimide nanofiber membrane is soaked in polydimethylsiloxane solution and silicon dioxide nanoparticle suspension in sequence, taken out and dried. The PDMS-SNPs / PI film obtained by the present invention can work normally under harsh conditions such as high temperature, strong acid and strong alkali; meanwhile, the nanostructure with rough surface has improved oil-water separation performance, and the separation efficiency can reach more than 98%, and can be recycled and reused .

Description

technical field [0001] The invention relates to a modification technology of a nanofiber membrane, in particular to a superhydrophobic and superoleophilic nanofiber membrane for separating oil-water mixtures and a preparation method thereof, which can normally work under extreme conditions such as strong acid, strong alkali and high temperature. Background technique [0002] With the growth of world population and the advancement of science and technology, the total amount of water used in the world is increasing year by year. The proportion of petroleum wastewater is increasing. Oil pollution has become a problem faced by the whole world. Frequent oil spill accidents have caused serious harm to the environment and human health. Oil spills often occur in the process of oil extraction, transportation, storage and use [2] , not only lead to energy loss and waste of resources, but also pose a threat to the ecological environment on which our long-term survival depends. Tradi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/60B01D69/08B01D67/00B01D17/02
CPCB01D17/085B01D67/0079B01D69/08B01D71/60
Inventor 黄超伯崔佳欣张梦洁马文静吴书天
Owner NANJING FORESTRY UNIV
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