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Method for preparing two-dimensional graphitic carbon nitride dispersion liquid through ultrasonic coupling supergravity rotating bed stripping

A supergravity rotating bed, graphitic carbon nitride technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc. Quality and dispersion effects, high-quality effects

Pending Publication Date: 2019-12-31
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, high-gravity technology has been successfully applied to the exfoliation of two-dimensional materials, but there are still some problems. For example, patent CN10580545A discloses a liquid-phase shear exfoliation technology based on a high-gravity rotating bed reactor. This process is simple and easy to scale up. But the yield of exfoliated 2D nanosheet monolayer is low

Method used

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  • Method for preparing two-dimensional graphitic carbon nitride dispersion liquid through ultrasonic coupling supergravity rotating bed stripping
  • Method for preparing two-dimensional graphitic carbon nitride dispersion liquid through ultrasonic coupling supergravity rotating bed stripping
  • Method for preparing two-dimensional graphitic carbon nitride dispersion liquid through ultrasonic coupling supergravity rotating bed stripping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Accurately weigh 30g of urea and put it into 6 crucibles, cover the crucibles and put them into a muffle furnace, raise the temperature to 550°C, the heating rate is 2°C / min, keep it warm for 4h, then cool it naturally, grind it fully, put The prepared powder is named bulk g-C 3 N 4 ;

[0049] (2) Weigh 10g bulk g-C 3 N 4 , add 200ml of concentrated sulfuric acid, stir magnetically at room temperature for 6h, then add 100ml of deionized water, continue to stir for 2h, filter and wash with water until pH = 7, freeze-dry to obtain protonated carbon nitride (protonated carbon nitride, p-g-C 3 N 4 ).

[0050] (3) Weigh 0.8g of protonated carbon nitride powder and 0.8g of polyvinylpyrrolidone, and add it to a beaker containing 800ml of isopropanol to form a carbon nitride bulk dispersion with a concentration of 1mg / ml;

[0051] (4) Add the carbon nitride bulk dispersion into the circulation tank, start the ultrasonic probe arranged on the side wall of the circulati...

Embodiment 2

[0057] (1) Accurately weigh 30g of urea and put it into 6 crucibles, cover the crucibles and put them into a muffle furnace, raise the temperature to 550°C, the heating rate is 2°C / min, keep it warm for 2h, then cool naturally, grind fully, put The prepared powder is named bulk g-C 3 N 4 ;

[0058] (2) Weigh 10g bulk g-C 3 N 4 , add 200ml of concentrated sulfuric acid, stir magnetically at 35°C for 10h, then add 100ml of deionized water, continue to stir for 2h, filter and wash with water until pH = 7, freeze-dry to obtain protonated carbon nitride (p-g-C 3 N 4 ).

[0059] (3) Weigh 1.0 g of protonated carbon nitride powder and 2.0 g of CTAB, and add it to a beaker containing 800 ml of ethanol to form a carbon nitride bulk dispersion with a concentration of 1.25 mg / ml;

[0060] (4) Add the carbon nitride bulk dispersion into the circulation tank, and start the ultrasonic probe arranged on the side wall of the circulation tank, and first peel off the carbon nitride bulk d...

Embodiment 3

[0062] (1) Accurately weigh 30g of urea and put it into 6 crucibles, cover the crucibles and put them into a muffle furnace, raise the temperature to 500°C, the heating rate is 2°C / min, keep it warm for 2h, then cool it naturally, grind it fully, put The prepared powder is named bulk g-C 3 N 4 ;

[0063] (2) Weigh 10g bulk g-C 3 N 4 , add 200ml of concentrated sulfuric acid, stir magnetically at 50°C for 6h, then add 100ml of deionized water, continue stirring for 2h, filter and wash with water until pH = 7, freeze-dry to obtain protonated carbon nitride (p-g-C 3 N 4 ).

[0064] (3) Take 1.2g of protonated carbon nitride powder and add it to a beaker containing 800ml of tetramethylammonium hydroxide 50% aqueous solution to form a carbon nitride bulk dispersion with a concentration of 1.5mg / ml ;

[0065] (4) Add the carbon nitride bulk dispersion into the circulation tank, and start the ultrasonic probe arranged on the side wall of the circulation tank, and first peel of...

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Abstract

The invention discloses a method for preparing a two-dimensional graphitic carbon nitride dispersion liquid by using ultrasound coupling supergravity rotating bed through stripping, and belongs to thetechnical field of preparation of carbon nitride dispersion liquids. The method comprises the following steps: (1) carrying out a solid-phase thermal polycondensation reaction by taking a nitrogen-rich organic compound as a raw material to obtain blocky graphitic carbon nitride; (2) carrying out protonation modification on the blocky graphitic carbon nitride by adopting a protonic acid, carryingout washing, carrying out drying and carrying out grinding to obtain protonated carbon nitride; and (3) dispersing the protonated carbon nitride powder into a chemical liquid to obtain a material dispersion liquid, introducing the material dispersion liquid into an ultrasoud coupling supergravity rotating bed system, stripping the material under the synergistic effect of ultrasonic waves and supergravity shearing force, and carrying out centrifugal separation to obtain the carbon nitride dispersion liquid. The method is simple and easy to implement, low in cost, high in stripping efficiency and high in yield, can realize continuous large-scale production, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of chemical engineering and technology, and specifically relates to a method for preparing a two-dimensional graphite-phase carbon nitride dispersion liquid by exfoliating an ultrasonically coupled high-gravity rotating bed. Background technique [0002] Graphite carbon nitride (graphitic carbon nitride, g-C 3 N 4 ) due to its unique two-dimensional planar structure, good thermal stability, chemical stability and relatively narrow bandgap (2.70eV) is used as a new type of visible light photocatalytic material for hydrogen production in photolysis of water (Applied Catalysis B:Environmental , 2018, 227:418-424.), CO 2 Reduction (Catalysis Today,2018,300:160-172.), mineralization and degradation of organic pollutants (Applied Surface Science,2018,455:705-716.), selective organic synthesis (ACS Sustainable Chemistry & Engineering,2019,7( 9): 8176-8182.) and bacterial disinfection (Chemosphere, 2019, 214: 462-479.) hav...

Claims

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Application Information

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IPC IPC(8): C01B21/082B82Y30/00B82Y40/00
CPCC01B21/0605C01P2004/62
Inventor 白苗苗孟宇王强安小康高平强马向荣
Owner YULIN UNIV
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