Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of superhydrophobic nanofiber membrane and superhydrophobic nanofiber membrane

A nanofiber membrane, super-hydrophobic technology, applied in the preparation of super-hydrophobic nanofiber membranes, in the field of super-hydrophobic 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: 2021-11-16
NANJING FORESTRY UNIV
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of superhydrophobic nanofiber membrane and superhydrophobic nanofiber membrane
  • A kind of preparation method of superhydrophobic nanofiber membrane and superhydrophobic nanofiber membrane
  • A kind of preparation method of superhydrophobic nanofiber membrane and superhydrophobic nanofiber membrane

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
angleaaaaaaaaaa
separationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a superhydrophobic nanofiber membrane and the superhydrophobic nanofiber membrane, comprising: dissolving monomer biphenyltetracarboxylic dianhydride and p-phenylenediamine in N,N-dimethylformamide, PAA was synthesized by reaction at low temperature, PAA was made into PAA nanofiber membrane by electrospinning, and then imidized to obtain PI membrane; ferric chloride and phytic acid were used for layer-by-layer self-assembly and PDMS solution dip-coating modification to obtain The superhydrophobic nanofibrous membrane. The invention realizes the utilization of the layer-by-layer self-assembled structure, on the basis of which, a silane coupling agent is introduced, and the two are combined to obtain an oil-water separation membrane with super-hydrophobic and super-oleophilic wettability. The nanostructure with rough surface can improve the oil-water separation performance, the separation efficiency of this membrane can reach more than 99%, and it has been verified that it can be recycled and reused.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com