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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  • 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

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

Examples

Experimental program
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Example Embodiment

[0020] Example 1

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

Example Embodiment

[0022] Example 2

[0023] First, prepare graphite-type carbon nitride powder, weigh 15g of melamine in a crucible, place it in a muffle furnace, heat up to 550℃ for heat treatment for 4h, take it out after cooling, and grind for later use; weigh 1g graphite-type carbon nitride powder It is placed in a ball milling tank containing 200 ml of water / ethanol (volume ratio of 10 / 1), in which 500 zirconia beads with a diameter of 1 mm are installed in the grinding tank. The concentration of graphite-type carbon nitride powder is 5mg / mL, and the ball milling jar is placed on the jar mill for 12h (such as figure 1 Shown); Take out the carbon nitride suspension solution after ball milling, place it in an ultrasonic disperser for ultrasonic peeling, ultrasonic power 100w, ultrasonic time 1h; centrifuge the ultrasonic peeled solution for 0.5h, centrifuge speed 3000rpm, Take the supernatant to obtain a single-layer graphite carbon nitride nanosheet solution, the concentration of which is 0.65...

Example Embodiment

[0024] Example 3

[0025] Firstly prepare graphite-type carbon nitride powder, weigh 10g of dimer dicyandiamide in a crucible, place it in a muffle furnace, heat up to 550°C for 4 hours, take it out after cooling and grind for use; weigh 0.8g of graphite-type The carbon nitride powder is placed in a ball mill tank containing 200 ml of water / ethanol (volume ratio of 6 / 1), and the grinding tank contains 500 zirconia beads with a diameter of 1 mm. The concentration of graphite-type carbon nitride powder is 4mg / mL, and the ball milling jar is placed on the jar mill for 20h (such as figure 1 Shown); Take out the carbon nitride suspension solution after ball milling, place it in an ultrasonic disperser for ultrasonic peeling, ultrasonic power 120w, ultrasonic time 1h; centrifuge the ultrasonic peeled solution for 1h, centrifuge speed 4000rpm, take The supernatant can be used to obtain a single-layer graphite carbon nitride nanosheet solution with a concentration of 0.6 mg / mL.

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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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