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Super-hydrophobic super-oleophylic nanofiber membrane used for oil-water mixture separation and preparation method thereof

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

Active Publication Date: 2018-12-18
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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  • Super-hydrophobic super-oleophylic nanofiber membrane used for oil-water mixture separation and preparation method thereof
  • Super-hydrophobic super-oleophylic nanofiber membrane used for oil-water mixture separation and preparation method thereof
  • Super-hydrophobic super-oleophylic nanofiber membrane used for oil-water mixture separation and preparation method thereof

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 super-hydrophobic super-oleophylic nanofiber membrane used for oil-water mixture separation and a preparation method thereof. The preparation method comprises the following steps: dissolving biphenyltetracarboxylic dianhydride and p-phenylenediamine into N,N-dimethyl formamide, and reacting for 12-24 hours at a temperature of -10 to -5 DEG C under a nitrogen gas environment to synthesize a polyamide acid solution; dissolving biphenyltetracarboxylic dianhydride and p-phenylenediamine into N,N-dimethyl formamide, and reacting for 12-24 hours at a temperature of -10 to -5 DEG C under a nitrogen gas environment to synthesize a polyamide acid solution; dissolving biphenyltetracarboxylic dianhydride and p-phenylenediamine into N,N-dimethyl formamide, and reacting for 12-24 hours at a temperature of -10 to -5 DEG C under a nitrogen gas environment to synthesize a polyamide acid solution; preparing the polyamide acid solution into a polyamide acid nanofiber membrane,and heating for performing imidization on the polyamide acid nanofiber membrane to obtain a polyimide nanofiber membrane; and sequentially putting the polyimide nanofiber membrane into a polydimethylsiloxane solution and carbon dioxide nano-particle suspension liquid to soak, and taking out to dry. The obtained PDMS-SNPs / PI membrane can normally work under bad conditions such as a high-temperaturecondition, a strong acid condition and a strong alkaline condition; and meanwhile, the nano structure with a rough surface improves oil-water separating performance, has separating efficiency of 98%or above, and can be circularly and repeatedly used.

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 work normally 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 Applications(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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