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A kind of graphite phase carbon nitride nanosheet material and its preparation method and application

A technology of graphite phase carbon nitride and nanosheets, which is applied in the field of photocatalytic materials, can solve the problems of incomplete sheets and many holes in the sheets, and achieve the effects of easy operation, easy control of the reaction process, and low cost

Active Publication Date: 2021-01-15
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, there are reports that sulfuric acid, nitric acid or hydrochloric acid are used to acidify melamine and then calcined to prepare graphite phase carbon nitride materials, but the graphite phase carbon nitride materials prepared by the above method have incomplete sheets and incomplete sheets. problem with many holes

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  • A kind of graphite phase carbon nitride nanosheet material and its preparation method and application
  • A kind of graphite phase carbon nitride nanosheet material and its preparation method and application
  • A kind of graphite phase carbon nitride nanosheet material and its preparation method and application

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preparation example Construction

[0029] The invention provides a preparation method of a graphitic phase carbon nitride nanosheet material, comprising the following steps:

[0030] Mixing melamine and glacial acetic acid for acidification treatment to obtain an acidification treatment precursor;

[0031] The acidified precursor is calcined for the first time at 500-550°C for 3-5 hours, cooled to room temperature and then calcined for the second time at 500-600°C for 2-4 hours to obtain graphite phase carbon nitride nanosheet material.

[0032] The invention mixes melamine and glacial acetic acid and then performs acidification treatment to obtain an acidification treatment precursor. The present invention uses melamine as a raw material, and uses glacial acetic acid to acidify it, avoiding the problem in the prior art that the melamine structure is easily damaged by using inorganic strong acids, resulting in incomplete graphite phase carbon nitride nanosheets and even many holes; Glacial acetic acid is an o...

Embodiment 1

[0046] Weigh 30g of melamine, put it into 100mL of glacial acetic acid with a purity greater than 99.5wt%, stir for 12h with a magnetic stirrer at room temperature (25°C), stop stirring, filter the resulting system, and deionize the resulting solid material Wash until neutral, then put it in a drying oven to dry at a constant temperature of 50°C, transfer it to a crucible after drying, and raise the temperature from room temperature to 500°C at a rate of 10°C / min in an air atmosphere, keep it for calcination for 3 hours, and then Cool the furnace to room temperature; then raise the temperature from room temperature to 500 °C at a rate of 2 °C / min in an air atmosphere, keep the temperature for calcination for 2 hours, and cool to room temperature with the furnace. The obtained product is taken out and ground to obtain a multi-sheet structure The graphitic phase carbon nitride nanosheet material, wherein, the thickness of the monolithic graphite phase carbon nitride nanosheet is ...

Embodiment 2

[0048] Weigh 20 g of melamine, put it into 100 mL of glacial acetic acid with a purity greater than 99.5 wt %, stir for 24 hours at room temperature (25° C.) with a magnetic stirrer, and after the stirring is stopped, filter the resulting system, and deionize the resulting solid material Wash until neutral, then put it in a drying oven to dry at a constant temperature of 50°C, transfer it to a crucible after drying, and raise the temperature from room temperature to 520°C at a rate of 10°C / min in an air atmosphere, keep it for calcination for 4 hours, and then Cool the furnace to room temperature; then raise the temperature from room temperature to 550 °C at a rate of 2 °C / min in an air atmosphere, heat-preserve and calcinate for 3 hours, cool to room temperature with the furnace, take out the obtained product and grind it to obtain a multi-sheet structure The graphitic phase carbon nitride nanosheet material, wherein, the thickness of the monolithic graphite phase carbon nitri...

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Abstract

The invention provides a graphite phase carbon nitride nanosheet material and its preparation method and application, belonging to the technical field of photocatalytic materials. The preparation method of graphitic phase carbon nitride nanosheet material in the present invention includes the following steps: mixing melamine and glacial acetic acid and then performing acidification treatment to obtain an acidification treatment precursor; conducting the acidification treatment precursor under the conditions of 500 to 550°C. Calcining once for 3 to 5 hours, cooling and then calcining for a second time at 500 to 600°C for 2 to 4 hours to obtain graphite phase carbon nitride nanosheet material. Compared with bulk graphite phase carbon nitride, the graphitic phase carbon nitride nanosheet material provided by the present invention has a multi-lamellar structure and a large specific surface area, and the lamellar structure is complete. It can be used as a photocatalytic material and can be used in light It provides more active sites during the catalytic process, allowing the photogenerated electrons to be quickly transferred during the photocatalytic process, effectively preventing the recombination of electron-hole pairs in the material, and has good photocatalytic activity.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a graphite-phase carbon nitride nanosheet material and a preparation method and application thereof. Background technique [0002] In various visible light-driven photocatalysts, the inorganic non-metallic polymer semiconductor material graphitic carbon nitride (g-C 3 N 4 ) has been widely used in the field of photocatalysis because of its suitable band gap value (2.7eV), high thermal and chemical stability, and low cost. At present, the most common method for preparing graphitic carbon nitride is to obtain it by pyrolyzing raw materials such as urea, dicyandiamide or melamine. However, graphitic carbon nitride prepared by pyrolysis is a multi-layer sheet-like stacked block, which has the disadvantages of rapid recombination of photogenerated carriers, low surface area and low active site density, and its practical application is limited. Therefore, improving ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02B01J35/00
CPCB01J27/24B01J35/40B01J35/39
Inventor 黄浩杨茜胡婕张春迎温斌
Owner YANSHAN UNIV
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