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Method for preparing hydrophobic graphene film

A technology of graphene film and graphene dispersion, which is applied in the fields of graphene, general water supply saving, chemical instruments and methods, etc., can solve the problems that limit the practical application of graphene oxide, and achieve the effect of simple preparation process and high separation performance

Active Publication Date: 2020-07-28
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrophilicity and limited nanoporosity of graphene oxide limit the practical application of graphene oxide in the field of membrane distillation desalination.

Method used

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  • Method for preparing hydrophobic graphene film
  • Method for preparing hydrophobic graphene film
  • Method for preparing hydrophobic graphene film

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The method of the present invention is used to prepare hexadecyltrimethoxysilane modified hydrophobic graphene film (the preparation process is as follows: figure 1 Shown).

[0027] (1) Preparation of graphene dispersion: add 0.25 mg of graphene oxide to 200 mL of water, stir and sonicate to obtain a uniformly dispersed graphene aqueous solution;

[0028] (2) Preparation of nano-particle dispersion: add 0.02 g of silica with a particle size of 200 nm to 20 mL of water, and after ultrasonic and stirring, a uniform silica dispersion is obtained;

[0029] (3) Preparation of hydrophobic modifier: 4g cetyltrimethoxysilane, 2g water and 198g ethanol are uniformly mixed, and after stirring, a hydrolyzed hydrophobic modifier solution is obtained;

[0030] (4) Preparation of rough graphene film: add 0.25 mL of silica dispersion to the above graphene dispersion, stir for 2 hours, and use vacuum filtration to form a film on the polyacrylonitrile support (film thickness ~ 350nm) , After dr...

Embodiment 2

[0034] The method of the present invention is used to prepare a hydrophobic graphene film modified by dodecyltrimethoxysilane (the preparation process is as follows: figure 1 Shown).

[0035] (1) Preparation of graphene dispersion: 0.22 mg of graphene oxide was added to 100 mL of water, stirred and sonicated to obtain a uniformly dispersed graphene aqueous solution;

[0036] (2) Preparation of nano-particle dispersion: 0.01 g of silica with a particle size of 250 nm is added to 10 mL of water, and after ultrasound and stirring, a uniform silica dispersion is obtained;

[0037] (3) Preparation of hydrophobic modifier: 3.8g of dodecyltrimethoxysilane, 2.2g of water and 198g of ethanol are uniformly mixed, and after stirring, a hydrolyzed hydrophobic modifier solution is obtained;

[0038] (4) Preparation of rough graphene film: 0.22 mL of silica dispersion was added to the above graphene dispersion, stirred for 2 hours, and vacuum filtration was used to form a film on the polyacrylonitri...

Embodiment 3

[0042] The method of the present invention is used to prepare octadecyltrimethoxysilane modified hydrophobic graphene film (the preparation process is as figure 1 ).

[0043] (1) Preparation of graphene dispersion: add 0.4 mg of graphene oxide to 100 mL of water, stir and ultrasonic to obtain a uniformly dispersed graphene aqueous solution;

[0044] (2) Preparation of nanoparticle dispersion: add 0.03 g of silica with a particle size of 280 nm to 30 mL of water, and after ultrasonic and stirring, a silica dispersion is obtained;

[0045] (3) Preparation of hydrophobic modifier: Mix 5g of octadecyltrimethoxysilane, 2g of water and 197g of ethanol uniformly, and after stirring, obtain a hydrolyzed hydrophobic modifier solution;

[0046] (4) Preparation of rough graphene film: 0.4mL of silica dispersion was added to the above graphene dispersion, stirred for 2h, and a film was formed on the polycarbonate support by vacuum filtration (film thickness ~500nm) , After drying at 40℃ for 12h, ...

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Abstract

The invention relates to a method for preparing a hydrophobic graphene film. Interlayer pore channels and surface roughness of the graphene film are enhanced by intercalating nanoparticles, and then the hydrophobic graphene film is obtained by long-chain alkane treatment. According to the method, the surface roughness and hydrophobicity of the graphene oxide can be effectively improved, the preparation process is simple, and effective desalination and anti-pollution performance of the hydrophobic graphene film in the membrane distillation process can be conveniently realized.

Description

Technical field [0001] This technology belongs to the field of new material design and application research, and relates to a method of using nanoparticle intercalation to increase the interlayer channel and surface roughness of the film, and hydrophobic modification, and specifically to a method for preparing a hydrophobic graphene film It is expected to be applied to the field of membrane distillation desalination. Background technique [0002] In membrane separation, membrane distillation technology can be effectively used in the treatment of concentrated brine in the field of seawater desalination, and has the advantages of mild operating conditions and high theoretical rejection rate. Two-dimensional graphene has the characteristics of low radial heat transfer rate, nano-mass transfer channels that hinder the penetration of macromolecular pollutants, and intrinsic hydrophobicity. It is an ideal membrane distillation membrane material. The interaction force between the graph...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D69/10B01D71/02B01D61/36C02F1/44C01B32/182C01B32/194C02F103/08
CPCB01D67/0093B01D69/02B01D69/10B01D71/021B01D61/364C02F1/447C01B32/182C01B32/194B01D2325/38C02F2103/08Y02A20/131
Inventor 刘公平张梦辰金万勤
Owner NANJING UNIV OF TECH
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