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Super-hydrophobic modified nanofiber membrane as well as preparation method and application thereof

A nanofiber membrane, super-hydrophobic modification technology, applied in fiber types, fiber processing, chemical instruments and methods, etc., can solve problems such as poor toughness, prevent membrane wetting, and the preparation process is simple and easy to scale. production effect

Active Publication Date: 2017-07-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon nanofibers have a high modulus, their toughness is poor, and they cannot be made into membranes alone and used in membrane distillation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this example, a polyethersulfone nanofiber membrane modified by a carbon nanofiber network and nanocarbon particles with a pore size of 0.20 μm for membrane distillation is prepared, which can be used for seawater desalination. The specific preparation method includes the following steps:

[0040] (1) Dissolve 15 parts of polyethersulfone (molecular weight: 450,000) and 0.01 part of potassium chloride in 68 parts of N,N-dimethylformamide and 17 parts of acetone mixed solvent, and dissolve in a water bath at 55°C for 5 hours, Obtain a polyethersulfone electrospinning solution, and leave the solution overnight to remove air bubbles;

[0041] The above parts are parts by mass, unless otherwise specified, the same below.

[0042] (2) Electrospinning the polyethersulfone spinning solution for 12 hours to prepare a polyethersulfone nanofiber membrane. Wherein the needle of the syringe is a flat needle, and the needle is connected to the positive pole of the high voltage p...

Embodiment 2

[0048] In this example, a vinylidene fluoride hexafluoropropylene copolymer nanofiber membrane modified with a carbon nanofiber network and nanocarbon particles for membrane distillation with a membrane pore diameter of 0.35 μm was prepared. The specific preparation method includes the following steps:

[0049] (1) Dissolve 12 parts of vinylidene fluoride hexafluoropropylene copolymer (molecular weight: 600,000) and 0.01 part of sodium chloride in a mixed solvent of 70 parts of N-methylpyrrolidone and 18 parts of acetone, and stir at a constant temperature in a water bath at 60°C Dissolved for 6 hours to obtain a uniform and stable vinylidene fluoride hexafluoropropylene copolymer spinning solution, which was allowed to stand overnight to remove air bubbles;

[0050] (2) Electrospinning the vinylidene fluoride hexafluoropropylene copolymer spinning solution for 15 hours to prepare a vinylidene fluoride hexafluoropropylene copolymer nanofiber membrane. Wherein the needle of the...

Embodiment 2

[0054] The carbon nanofiber network for membrane distillation prepared in Example 2 and the nanofiber membrane modified by nanocarbon particles were tested for water contact angle, and the water contact angle was 161.0°, and the minimum osmotic pressure test was 178kPa.

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Abstract

The invention discloses a preparation method of a super-hydrophobic modified nanofiber membrane. The preparation method comprises the following steps: mixing a hydrophobic high polymer, electrolyte and a solvent A to obtain high polymer spinning solution, and carrying out electrostatic spinning, so that a nanofiber membrane is obtained; dispersing carbon nanofibers and nanocarbon particles into a solvent B to respectively obtain carbon nanofiber dispersion and nanocarbon particle dispersion, sequentially coating the nanofiber membrane, and drying, so that a precursor is obtained; and finally carrying out hot pressing, so that the super-hydrophobic modified nanofiber membrane is obtained. The invention discloses the preparation method of the super-hydrophobic modified nanofiber membrane, a number of nodes are avoided from being produced as the nanoparticles are directly doped into electrostatic spinning solution, the method is simple and convenient, the prepared modified nanofiber membrane has good hydrophobic property and is high in porosity, high in flux and extremely high in retention rate, and membrane requirements in a membrane distillation process are met.

Description

technical field [0001] The invention relates to the field of membrane distillation separation, in particular to a superhydrophobic modified nanofiber membrane and its preparation method and application. Background technique [0002] Membrane distillation is a relatively potential desalination membrane technology, which has received more and more attention in recent years. Because it can be operated at a relatively low temperature, it is considered an energy-saving membrane separation method, and it is also widely used in areas that are sensitive to temperature, such as fruit juice concentration and sugar concentration. Although it has the advantage of low energy consumption, membrane distillation separation technology has not been applied on a large scale. The main reason is that it mainly uses hydrophobic porous membranes, which are easily hydrophilized. Membrane distillation uses a membrane as a physical gas-liquid barrier that only allows gas molecules to pass through. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D67/00B01D69/02B01D71/26B01D71/30B01D71/34B01D71/68C02F1/08D06M11/74D06M101/22D06M101/30C02F103/08
CPCB01D61/364B01D67/0079B01D67/0093B01D69/02B01D71/26B01D71/30B01D71/34B01D71/68B01D2325/38C02F1/08C02F2103/08D06M11/74D06M2101/22D06M2101/30
Inventor 张林阎康康侯立安
Owner ZHEJIANG UNIV
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