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Vertically-oriented graphene/nanofiber composite membrane material and preparation method and application thereof

A nanofiber, vertical orientation technology, applied in the field of materials, can solve the problems of low efficiency and energy density

Active Publication Date: 2020-02-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional distillation is an energy-intensive and inefficient (energy conversion efficiency is only 5% to 20%) chemical industry liquid separation and purification process

Method used

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  • Vertically-oriented graphene/nanofiber composite membrane material and preparation method and application thereof
  • Vertically-oriented graphene/nanofiber composite membrane material and preparation method and application thereof
  • Vertically-oriented graphene/nanofiber composite membrane material and preparation method and application thereof

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preparation example Construction

[0056] According to the embodiments of the present invention, there is no special requirement for the preparation method of the nanofibers, and those skilled in the art can choose flexibly according to the actual situation. In some embodiments, nanofibers can be prepared by electrospinning. Specifically, the preparation steps include: configuring an electrospinning precursor solution with a certain viscosity and fluidity, and the solution mass concentration can be 16%-25%. Use a needle tube to draw 5mL solution and fix it in the card slot of the electrospinning device, use a roller covered with aluminum foil as a receiving device, adjust the receiving distance between the needle and the receiving device, set the positive voltage at the needle, the negative voltage at the receiving device and the input voltage. Electrospinning was carried out at the feed speed. Among them, the inner diameter of the needle can be 0.16~3.0mm, the positive voltage of the needle can be 10~25kV, the...

Embodiment 1

[0090] Preparation of Vertically Oriented Graphene / Nanofiber Composite Membrane Material

[0091] 1. Use the Hummers method to prepare a concentration of 5mgmL -1 graphene oxide dispersion.

[0092] 2. Prepare the silica nanofiber precursor by electrospinning method, place the silica nanofiber precursor at room temperature for 24 hours to volatilize excess solvent, put it in a tube furnace and anneal at 850°C in air atmosphere for 2 hours , with a heating rate of 10°C min -1 . Subsequently, the silica nanofibers were shear dispersed in the aqueous solution with a homogenizer to obtain a concentration of 3mgmL -1 A dispersion of silica nanofibers with a diameter of 200nm;

[0093] 3. Under the condition of mechanical stirring, the prepared graphene oxide solution and the aqueous solution of silica nanofibers were uniformly mixed for 2 hours, and the mass ratio of graphene oxide and nanofibers was 1:1.

[0094] 4. After the above-mentioned mixed solution is poured into the ...

Embodiment 2

[0099] Preparation of Vertically Oriented Graphene / Nanofiber Composite Membrane Material

[0100] 1. Use the Hummers method to prepare a concentration of 3mgmL -1 graphene oxide dispersion.

[0101] 2. The polyimide nanofiber precursor was prepared by electrospinning, and the polyimide nanofiber precursor was placed at room temperature for 36 hours to volatilize the excess solvent, and then placed in a tube furnace for annealing in an inert atmosphere. The annealing conditions are from room temperature to 150°C for 30 minutes, to 200°C for 30 minutes, to 250°C for 30 minutes, to 300°C for 30 minutes, and finally to 300°C for 30 minutes, with a heating rate of 10°C min -1 , to obtain polyimide nanofiber membrane. Subsequently, the polyimide nanofibers were shear dispersed in the aqueous solution with a homogenizer to obtain a concentration of 5 mg mL -1 A polyimide nanofiber dispersion with a diameter of 350nm;

[0102] 3. Under the condition of mechanical stirring, the pre...

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Abstract

The invention provides a vertically-oriented graphene / nanofiber composite membrane material and a preparation method and application thereof. The vertically-oriented graphene / nano-fiber composite membrane material comprises: graphene, which is provided with vertically-oriented channels arranged in an array; and nanofibers, which shuttle back and forth in the graphene and the channels. Therefore, when the composite membrane material is used as a distillation medium, distillation efficiency can be effectively improved, distillation energy consumption is reduced, and distillation time is shortened; moreover, due to the introduction of the nanofibers, the composite membrane material has excellent mechanical properties, so the composite membrane material can be compressed, bent and stretched without its structure not damaged, and thus, the composite membrane material maintains relatively high distillation efficiency for a long time.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a vertically oriented graphene / nanofiber composite membrane material and its preparation method and application. Background technique [0002] Distillation is a key technology in the chemical industry to purify and separate liquids from mixtures with different boiling points. It is widely used in petroleum, chemical, light industry, food processing and other industries. The traditional distillation process is to use the traditional heat source to heat the liquid to boiling, so that the generated vapor escapes from the liquid / gas interface and enters the condensing device, so that it is cooled and condensed into a liquid to achieve purification and separation. However, traditional distillation is an energy-intensive, low-efficiency (energy conversion efficiency is only 5% to 20%) chemical industry liquid separation and purification process. [0003] Therefore, the distillation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/36
CPCB01D61/364B01D67/0079B01D69/12
Inventor 曲良体张盼盼程虎虎
Owner TSINGHUA UNIV
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