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Preparation method for single-layer graphite-type carbon nitride nanosheet solution

A technology of graphite-type carbon nitride and single-layer graphite, applied in the field of nanomaterials, can solve problems such as unfavorable industrial production, long reaction time period, complicated process, etc., and achieves reduction of van der Waals force, widening of interlayer spacing, and improvement of efficiency. Effect

Inactive Publication Date: 2015-03-11
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reaction time period of direct ultrasonic stripping of carbon nitride powder in a solvent is long, and the energy consumption is high, which is not conducive to industrial production
At the same time, the types of solvents used in the reaction are relatively small, which requires more complicated processes when preparing single-layer carbon nitride nanosheets and other metals to form nanocomposites.
In addition, the concentration of the single-layer graphitic carbon nitride nanosheet solution prepared by the liquid phase exfoliation method is only 0.15 mg / mL

Method used

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  • Preparation method for single-layer graphite-type carbon nitride nanosheet solution
  • Preparation method for single-layer graphite-type carbon nitride nanosheet solution
  • Preparation method for single-layer graphite-type carbon nitride nanosheet solution

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Experimental program
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Effect test

Embodiment 1

[0021] First prepare graphite-type carbon nitride powder, weigh 10g of melamine in a crucible, place it in a muffle furnace, heat it up to 550°C for 4 hours, take it out after cooling and grind it for later use; weigh 0.5g of graphite-type carbon nitride powder The body was placed in a ball mill jar filled with 200 ml of water, wherein 500 zirconia microbeads with a diameter of 1 mm were housed in the mill jar. The concentration of graphite-type carbon nitride powder is 2.5mg / mL, and the ball mill jar is placed on the jar mill for ball milling for 24h (such as figure 1 shown); take out the carbon nitride suspension solution treated by ball milling, place it in an ultrasonic disperser for ultrasonic peeling, ultrasonic power 200w, ultrasonic time 1h; centrifuge the solution through ultrasonic peeling for 1h, centrifuge speed 4000rpm, take The supernatant can be used to obtain a single-layer graphitic carbon nitride nanosheet solution with a concentration of 1.5 mg / mL.

Embodiment 2

[0023] First prepare graphite-type carbon nitride powder, weigh 15g of melamine in a crucible, place it in a muffle furnace, heat it up to 550°C for 4 hours, take it out after cooling and grind it for later use; weigh 1g of graphite-type carbon nitride powder Place in a ball milling jar equipped with 200 ml of water / ethanol (volume ratio of 10 / 1), wherein 500 zirconia microbeads with a diameter of 1 mm are housed in the grinding jar. The concentration of graphite carbon nitride powder is 5mg / mL, and the ball mill jar is placed on the jar mill for 12h (such as figure 1 shown); take out the carbon nitride suspension solution treated by ball milling, place it in an ultrasonic disperser for ultrasonic peeling, ultrasonic power 100w, ultrasonic time 1h; centrifuge the solution through ultrasonic peeling for 0.5h, centrifuge speed 3000rpm, The supernatant was taken to obtain a single-layer graphitic carbon nitride nanosheet solution with a concentration of 0.65 mg / mL.

Embodiment 3

[0025] First prepare graphite-type carbon nitride powder, weigh 10g of dicyandiamide in a crucible, place it in a muffle furnace, heat it up to 550°C for 4 hours, take it out after cooling and grind it for later use; weigh 0.8g of graphite-type The carbon nitride powder was placed in a ball mill jar filled with 200 ml of water / ethanol (volume ratio 6 / 1), wherein 500 zirconia microbeads with a diameter of 1 mm were housed in the mill jar. The concentration of graphite-type carbon nitride powder is 4mg / mL, and the ball mill jar is placed on the jar mill for 20h ball milling (such as figure 1 shown); take out the carbon nitride suspension solution treated by ball milling, put it in an ultrasonic disperser for ultrasonic stripping, ultrasonic power 120w, ultrasonic time 1h; centrifuge the solution through ultrasonic stripping for 1h, centrifuge speed 4000rpm, take The supernatant can be used to obtain a single-layer graphitic carbon nitride nanosheet solution with a concentration ...

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Abstract

The invention discloses a preparation method for a single-layer graphite-type carbon nitride nanosheet solution. The preparation method comprises the following steps: selecting tripolycyanamide or urea or bipolydicyanamide as a precursor, and performing pyrolytic reaction to obtain graphite-type carbon nitride powder; weighing carbon nitride powder, putting the carbon nitride powder into a ball milling jar with an aqueous solution of a polar solvent or a surfactant, and putting into a jar mill for ball milling; after ball milling for a certain time, pouring out a suspension, performing ultrasonic exfoliation by using an ultrasonic dispersion instrument, and centrifuging the obtained solution; taking a supernatant, namely the single-layer graphite-type carbon nitride nanosheet solution. Compared with the prior art that the single-layer graphite-type carbon nitride nanosheet solution is obtained by using a high-power ultrasonic exfoliation instrument, the preparation method provided by the invention has the advantages as follows: after ball milling pretreatment, the ultrasonic exfoliation on the carbon nitride powder is carried out, so that energy consumption is lower in the preparation process, and the prepared graphite-type carbon nitride nanosheet solution is higher in concentration and relatively low in cost.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a method for preparing a single-layer graphite-type carbon nitride nanosheet solution. Background technique [0002] Graphite carbon nitride has attracted extensive attention from researchers all over the world due to its excellent properties such as good chemical and thermal stability, non-toxicity, easy availability of raw materials, and no metals. Especially in recent years, it has been discovered for the first time that graphitic carbon nitride has excellent photocatalytic water splitting hydrogen production performance, which has aroused people's strong research interest. Graphite phase carbon nitride has a layered structure, with strong chemical bonds in the layer and extremely weak van der Waals force between layers. By destroying the van der Waals force between layers, a single layer of carbon nitride nanosheets can be obtained. This two-dimensional structur...

Claims

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Application Information

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IPC IPC(8): C01B21/082B82Y30/00B82Y40/00
Inventor 阎鑫郭豪彦赵佳伟王慧陶婧颖王轩赵鹏艾涛苏兴华
Owner CHANGAN UNIV
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