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g-C3N4 two-dimensional nanosheet film which can be used for gas separation as well as preparation method of film and application in gas separation

A two-dimensional nano, gas separation technology, applied in separation methods, semi-permeable membrane separation, greenhouse gas capture, etc., can solve problems such as solvent hazards, cumbersome nanosheet processes, easy to pollute the environment, etc., and achieve low cost and broad application prospects. , good repeatability

Active Publication Date: 2018-05-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some deficiencies. First, in addition to graphene oxide (GO) and graphene (graphene), researchers have focused on ultrafiltration and nanofiltration of nanosheet separation membranes, and have little involvement in other aspects of the separation field. Second, the process of preparing nanosheets is too cumbersome, and the solvents used are too dangerous and easy to pollute the environment

Method used

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  • g-C3N4 two-dimensional nanosheet film which can be used for gas separation as well as preparation method of film and application in gas separation
  • g-C3N4 two-dimensional nanosheet film which can be used for gas separation as well as preparation method of film and application in gas separation
  • g-C3N4 two-dimensional nanosheet film which can be used for gas separation as well as preparation method of film and application in gas separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Put melamine in a tube furnace, heat-treat at 3°C / min to 600°C for 3 hours under nitrogen atmosphere, then cool down to 30°C at 3°C / min to obtain agglomerated g-C 3 N 4 ;

[0048] (2) The calcined agglomerated g-C 3 N 4 Grind into powder, take 500mg calcined g-C 3 N 4 Disperse the powder in 1000ml N,N-dimethylformamide (DMF), sonicate for 8 hours and then let stand for 10 hours; then centrifuge at 3000r / min for 20min, take the supernatant, and repeat the centrifugation for 3 times until the supernatant is free of Precipitate to get g-C 3 N 4 The two-dimensional nanosheet solution has a concentration of 0.01 mg / ml measured by a UV-visible spectrophotometer, and is stored at 0°C;

[0049] To the g-C that step (2) obtains 3 N 4 g-C in two-dimensional nanosheet solution 3 N 4 Two-dimensional nanosheets were tested by atomic force microscopy (AFM), and the results were as follows figure 1 shown by figure 1 It can be seen that: g-C 3 N 4 The thickness of th...

Embodiment 2

[0056] (1) Put melamine in a tube furnace, heat it at 2°C / min to 500°C for 10 hours under nitrogen atmosphere, and then cool it down to 30°C at 2°C / min to obtain agglomerated g-C 3 N 4 ;

[0057] (2) The calcined agglomerated g-C 3 N 4 Grind into powder, take 1g calcined g-C 3 N 4 Disperse the powder in 1000ml of N-methyl-pyrrolidone (NMP), sonicate for 4 hours and let it stand for 8 hours; then centrifuge at 5000r / min for 20 minutes, take the supernatant, and repeat the centrifugation for 3 times until the supernatant has no precipitation. get g-C 3 N 4 The two-dimensional nanosheet solution has a concentration of 0.005 mg / ml measured by a UV-visible spectrophotometer, and is stored at -4°C;

[0058] (3) Soak the polysulfoneamide membrane with a pore size of 180nm in 2mg / mL dopamine hydrochloride solution for 22h, and then make the g-C 3 N 4 Two-dimensional nanosheets deposited on polysulfoneamide membranes to form g-C 3 N 4 Two-dimensional nanosheet membrane, and ...

Embodiment 3

[0063] (1) Put cyanamide in a tube furnace, heat it at 5°C / min to 800°C for 2 hours under nitrogen atmosphere, and then cool down to 30°C at 5°C / min to obtain agglomerated g-C 3 N 4 ;

[0064] (2) The calcined agglomerated g-C 3 N 4 Grind into powder, take 2g calcined g-C 3 N 4 Disperse the powder in 1000ml formamide, sonicate for 24 hours and let it stand for 12 hours; then centrifuge at 8000r / min for 20 minutes, take the supernatant, and repeat the centrifugation for 3 times until the supernatant has no precipitation, you can get g-C 3 N 4 The two-dimensional nanosheet solution has a concentration of 0.02 mg / ml measured by an ultraviolet-visible spectrophotometer, and is stored at 4°C;

[0065] (3) Soak the sulfonated polysulfone membrane with a pore size of 200nm in a Nafion solution with a mass concentration of 5% for 24h, and then make the g-C 3 N 4 Two-dimensional nanosheets deposited on sulfonated polysulfone membranes to form g-C 3 N 4 Two-dimensional nanoshe...

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Abstract

The invention discloses a g-C3N4 two-dimensional nanosheet film which can be used for gas separation as well as a preparation method of the film and an application in gas separation. The method includes the following steps: (1) performing heat treatment to obtain block-shaped g-C3N4; (2) performing liquid phase stripping to obtain a g-C3N4 two-dimensional nanosheet solution; and (3) depositing g-C3N4 two-dimensional nanosheets to a substrate by utilizing a two-dimensional nanosheet film forming technology, so as to obtain the g-C3N4 two-dimensional nanosheet film. In the preparation process ofthe nanosheet film provided by the invention, non-toxic, non-harmful and non-polluting reagents are used, and the method does not cause secondary pollution, is green and environmentally friendly, andhas the advantages of simple operation, short time consumption, low costs, good repeatability, and realization of large-scale industrialized production. The g-C3N4 two-dimensional nanosheets in the g-C3N4 two-dimensional nanosheet film provided by the invention have a large transverse dimension, and the film has a high air permeability, good stability and wide application prospects, and can be well applied to separation of hydrogen and gas molecules with different dynamic diameters and characteristics.

Description

technical field [0001] The invention belongs to the technical field of gas separation membranes, in particular to a g-C 3 N 4 Two-dimensional nanosheet separation membrane and its preparation method and application in gas separation. Background technique [0002] With the development of the global economy and the increase in energy demand, many environmental problems have been brought about, so it is imperative to promote the use of clean energy. Hydrogen has the advantages of relatively high calorific value, non-toxic, clean, etc., and hydrogen energy has the characteristics of being able to be stored and transported. Among them, hydrogen fuel cell vehicles use hydrogen gas as the energy source. It can achieve zero emissions and high efficiency. Unlike fossil energy, hydrogen energy is renewable. It will undoubtedly be the future energy of mankind and is expected to be used as a new energy source. The most important alternative of energy. Therefore, the preparation and ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00B01D53/22
CPCB01D53/228B01D67/0069B01D71/02Y02C20/20
Inventor 王海辉刘玲妃薛健
Owner SOUTH CHINA UNIV OF TECH
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