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Adjustable and controllable ultrathin two-dimensional nano g-C3N4 film, and preparation method and application thereof

A two-dimensional nano, g-C3n4 technology, applied in the field of adjustable ultra-thin two-dimensional nano g-C3N4 film and its preparation, can solve the problem of poor controllability of graphene base film, cumbersome graphene preparation process, large consumption of reagents or Energy and other issues, to achieve the effects of chemical corrosion resistance and mechanical properties, the preparation method is simple and feasible, and the cost is low

Active Publication Date: 2015-12-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are only a few types of two-dimensional membranes. Except for the widely studied graphene-based membranes, there are few research reports on other two-dimensional membranes.
However, the preparation process of graphene is cumbersome, and the preparation needs to consume a large amount of reagents or energy, which is easy to cause pollution to the environment, and the graphene-based film has poor controllability.

Method used

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  • Adjustable and controllable ultrathin two-dimensional nano g-C3N4 film, and preparation method and application thereof
  • Adjustable and controllable ultrathin two-dimensional nano g-C3N4 film, and preparation method and application thereof
  • Adjustable and controllable ultrathin two-dimensional nano g-C3N4 film, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Put dicyandiamide into an atmosphere furnace, heat treatment at 1°C / min to 700°C for 0.5h under an inert atmosphere, and then cool down to normal temperature naturally to obtain agglomerated g-C 3 N 4 ;

[0033] (2) the agglomerated g-C 3 N 4 Grind it, put it into the atmosphere furnace again, and heat it up to 500°C at 2°C / min to calcine for 3 hours in the air atmosphere, and then cool it down to room temperature naturally to obtain calcined g-C 3 N 4 powder;

[0034] (3) Take 1g of calcined g-C 3 N 4 Disperse the powder in 1500ml deionized water, sonicate for 8h, then centrifuge at 2000r / min for 50min, and take the supernatant to obtain g-C 3 N 4 Two-dimensional nanosheet solution, its concentration measured by UV-Vis spectrophotometer is 0.04mg / ml;

[0035] (4) Add 0.02mM KCl solution to the solution of step (3) for modification, then pass the modified solution through a polyvinylidene fluoride membrane with a pore size of 450nm under vacuum filtration c...

Embodiment 2

[0038](1) Put dicyandiamide into the atmosphere furnace, heat treatment at 3°C / min to 550°C for 3h under inert atmosphere, and then cool down to normal temperature naturally to obtain agglomerated g-C 3 N 4 ;

[0039] (2) the agglomerated g-C 3 N 4 Grind it, put it into the atmosphere furnace again, and heat it up to 500°C at 2°C / min for calcination for 2 hours in the air atmosphere, then cool it down to room temperature naturally to obtain calcined g-C 3 N 4 powder;

[0040] (3) Take 0.5g calcined g-C 3 N 4 Disperse the powder in 1000ml deionized water, sonicate for 8h, then centrifuge at 5000r / min for 50min, and take the supernatant to obtain g-C 3 N 4 Two-dimensional nanosheet solution, its concentration measured by UV-Vis spectrophotometer is 0.03mg / ml;

[0041] (4) in the solution of step (3), add the KCl solution of 0.005mM to modify, then the modified solution is passed through a polycarbonate membrane with a pore size of 450nm under vacuum filtration condition...

Embodiment 3

[0045] (1) Put the melamine into the atmosphere furnace, heat it at 2°C / min to 600°C for 4 hours under an inert atmosphere, then cool down to normal temperature naturally, and obtain agglomerated g-C 3 N 4 ;

[0046] (2) the agglomerated g-C 3 N 4 Grind it, put it into the atmosphere furnace again, and heat it up to 550°C at 2°C / min for calcination for 2 hours in the air atmosphere, then cool it down to room temperature naturally to obtain calcined g-C 3 N 4 powder;

[0047] (3) Take 2g of calcined g-C 3 N 4 Disperse the powder in 1500ml deionized water, sonicate for 8h, then centrifuge at 8000r / min for 30min, and take the supernatant to obtain g-C 3 N 4 Two-dimensional nanosheet solution, its concentration measured by UV-Vis spectrophotometer is 0.035mg / ml;

[0048] (4) Add 0.001mM KCl solution to the solution of step (3) for modification, and then the modified solution is passed through an anodic aluminum oxide membrane with a pore size of 200nm under vacuum filtrat...

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Abstract

The invention belongs to the technical field of separating film materials, and discloses an adjustable and controllable ultrathin two-dimensional nano g-C3N4 film, and a preparation method and application thereof. The preparation method comprises the following steps of performing heat treatment on dicyandiamide or cyanurtriamide under an inert atmosphere to obtain caked g-C3N4; pulverizing the caked g-C3N4 and calcining under an air atmosphere to obtain g-C3N4 powder; dispersing the g-C3N4 powder in solvent to obtain g-C3N4 two-dimensional nanosheet solution; adding electrolyte solution for modifying; depositing a g-C3N4 two-dimensional nanosheet on a porous carrier of which the pore diameter is greater than 200 nanometers to form a two-dimensional g-C3N4 ultrathin film; and drying to remove the solvent so as to obtain the adjustable and controllable ultrathin two-dimensional nano g-C3N4 film loaded on the porous carrier. The g-C3N4 film is high in water permeability and high in separation efficiency, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of separation membrane materials, in particular to an adjustable ultra-thin two-dimensional nano g-C 3 N 4 Membrane and its preparation method and application. Background technique [0002] With the rapid development of the economy, people greatly enjoy the convenience brought by social progress, but a series of problems brought about by the economy cannot be ignored. For China, a country with poor per capita resources, the problem of environmental pollution is particularly prominent, especially various industrial and domestic sewage cast a shadow on the already extremely scarce water resources. Therefore, it is of great strategic significance to save water resources and use advanced science and technology to treat and reuse wastewater, which is in line with the national resource-saving and environment-friendly development policy. [0003] Among many water treatment technologies, membrane separation has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D69/00C04B41/85C02F1/44
Inventor 王海辉王艳杰丁力侯嘉敏
Owner SOUTH CHINA UNIV OF TECH
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