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Superhydrophobic nanofiber membrane and preparation method thereof

A nanofiber membrane and superhydrophobic technology, which is applied in the preparation of superhydrophobic nanofiber membranes and the field of superhydrophobic nanofiber membranes, can solve the problems of limited practical application and poor mechanical properties of fiber membranes, and achieve the effect of improving oil-water separation performance

Active Publication Date: 2019-05-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the overlapping and separation of individual fibers, the mechanical properties of the fiber membrane prepared by electrospinning are poor, which limits its practical application in oil-water separation.
In addition to this, the long-term durability of nanofibrous membranes currently used in harsh environments remains a big challenge.

Method used

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  • Superhydrophobic nanofiber membrane and preparation method thereof
  • Superhydrophobic nanofiber membrane and preparation method thereof
  • Superhydrophobic nanofiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] equipped with mechanical stirrer, thermometer, N 2 Into the 100mL three-necked round-bottomed flask leading out the inlet and outlet tubes, add 0.01mol of BPDA and 0.01mol of PDA, and mix uniformly. With strong mechanical stirring, 40 mL of DMAc solution was added. A low temperature reactor was used to control the reaction temperature at -5 °C. The flask was then connected to a nitrogen cylinder, under N 2 After reacting in the environment for 24 hours, it is found that the rod climbing phenomenon occurs in the flask, and the reaction can be terminated by exposing the reaction to the air to obtain the PAA polymer.

[0033]The preparation of polyamic acid (PAA) nanofiber film is dissolved in DMAc with the PAA polymer of above-mentioned gain, obtains the DMAc solution containing 3wt% PAA, adds the hexadecyl trimethyl bromide of 1‰ (wt%) ammonium to enhance its conductivity, placed under a magnetic stirrer and stirred for 1 h to obtain a uniformly mixed solution. Then ...

Embodiment 2

[0035] (1) The PI film (2cm×2cm) prepared in Example 1 was placed in ethanol and deionized aqueous solution and ultrasonically treated for 30 minutes to remove surface impurities.

[0036] (2) Accurately weigh 2.7029g ferric chloride hexahydrate solid, dissolve it with deionized water, and obtain 0.01mol / L FeCl at constant volume 3 solution.

[0037] (3) Immerse the cleaned PI membrane in FeCl 3 In the solution for 2min, the positively charged Fe 3+ / PI membrane, and then use distilled water to remove excess FeCl on the surface of the membrane 3 .

[0038] (4) The obtained positively charged Fe 3+ / PI membrane immersed in 0.013mol / L phytic acid (PA) solution for 2min to obtain negatively charged PA-Fe 3+ / PI membrane, and rinse the membrane thoroughly with distilled water to remove excess PA solution. In this manner as described above, one cycle of self-assembly is completed, and the process is repeated to obtain the desired number of cycles of self-assembly on the PI na...

Embodiment 3

[0041] Utilize field emission scanning electron microscope (S-4800, Japan Hitachi electronics company), observe the PI film that embodiment 2 prepares, PA-Fe 3+ / PI film, PDMS / PA-Fe 3+ / PI membrane surface morphology, it can be clearly seen that the three-dimensional porous structure on the fiber is combined with the micro / nanoscale protrusions to form a double rough structure very similar to the lotus leaf surface. 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.

[0042] Adopt Nicolet 360FT-IR spectrometer to identify respectively the PI film that embodiment 2 prepares, PA-Fe 3+ / PI film, PDMS / PA-Fe 3+ / PI membrane functional groups and membrane structural properties such as image 3 as shown in a. One of the adsorption peaks of PI fiber ...

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Abstract

The invention discloses a superhydrophobic nanofiber membrane and a preparation method thereof. The superhydrophobic nanofiber membrane comprise the steps of dissolving monomer biphenyl tetracarboxylic dianhydride and p-phenylenediamine in N, N-dimethylformamide, reacting at low temperature to synthesize PAA, preparing a PAA nanofiber membrane from PAA through electrostatic spinning, and then imidizing to obtain a PI membrane; and carrying out layer-by-layer self-assembly by using ferric chloride and phytic acid and carrying out dip-coating modification by using a PDMS solution to obtain the superhydrophobic nanofiber membrane. According to the invention, a layer-by-layer self-assembly structure is utilized, a silane coupling agent is introduced on the basis, and the layer-by-layer self-assembly structure and the silane coupling agent are combined to obtain an oil-water separation membrane with super-hydrophobic and super-oleophilic wettability. A nano structure with a rough surface has improved oil-water separation performance, the separation efficiency of the membrane can reach 99% or above, and by verification, the membrane can be recycled.

Description

technical field [0001] The invention belongs to the technical field of oil-water separation membrane preparation, and in particular relates to a preparation method of a superhydrophobic nanofiber membrane and the superhydrophobic nanofiber membrane. Background technique [0002] Traditional oil-water separation methods include biological treatment, condensation, air flotation, and adsorption, but these methods have limitations such as low separation efficiency, high energy consumption, complex process, and easy generation of secondary pollutants. Therefore, it is imminent to develop an effective oil-water separation technology. [0003] In recent years, membrane separation has been recognized as an alternative technology for the separation of oil-water mixtures due to its advantages of simple operation, high separation efficiency, low production cost, good flexibility, and controllable environment. Therefore, more and more research efforts focus on membrane separation techn...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D61/38B01D17/022D01D5/00D04H1/728D06M11/28D06M13/292D06M15/643D06M101/30
Inventor 黄超伯崔佳欣张梦洁马文静吴书天
Owner NANJING FORESTRY UNIV
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