Hexagonal tubular carbon nitride as well as preparation method and application thereof

A carbon nitride, tubular technology, used in chemical instruments and methods, nitrogen compounds, nitrogen and non-metallic compounds, etc., to achieve uniform size distribution, simple and easy methods, and improved photocatalytic properties.

Active Publication Date: 2019-03-01
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still difficult to realize the non-template method, especially the precise synthesi

Method used

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  • Hexagonal tubular carbon nitride as well as preparation method and application thereof
  • Hexagonal tubular carbon nitride as well as preparation method and application thereof
  • Hexagonal tubular carbon nitride as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1.1 Heat 10 g of melamine to 550 °C at a heating rate of 2 °C / min and keep it for 2 hours to obtain a bulk carbon nitride precursor.

[0043] 1.2. Disperse 1.5 g block carbon nitride synthesized at 550 ℃ in 60 ml deionized water and stir well.

[0044] 1.3. Transfer the liquid from step 1.2 to a 100 ml reaction kettle, and react in a closed manner at 200 °C for 10 h. After the reaction, centrifuge to obtain a white floc.

[0045] 1.4. The product obtained in step 1.3 was centrifuged and washed several times with deionized water, and then freeze-dried (that is, freeze-dried) under the conditions of a vacuum degree of less than 20Pa and a freezing temperature of less than -20°C.

[0046] 1.5. Under the protection of argon gas, the white floc obtained in the above step 1.4 was heated to 650 °C at a heating rate of 5 °C / min, kept for 2 h, and then naturally cooled with the furnace to obtain the final carbon nitride product.

[0047] figure 1 It is the SEM figure of gaine...

Embodiment 2

[0049] Hexagonal tubular carbon nitride was prepared according to the method of Example 1, except that melamine was replaced by dicyandiamide, and 1.5 g of block carbon nitride could be obtained at the same time. The obtained carbon nitride morphology and image 3 Similarly, it is a hexagonal tubular shape with a length of about 50-65 μm, the side length of the cross-section of the inner wall is 450-590 nm, and the wall thickness is 100-200 nm.

Embodiment 3

[0051] Hexagonal tubular carbon nitride was prepared according to the method of Example 1, except that melamine was replaced by urea, and 1.5 g of block carbon nitride could be obtained at the same time. The obtained carbon nitride morphology and image 3 Similarly, it is a hexagonal tubular shape with a length of about 55-60 μm, the side length of the cross-section of the inner wall is 400-600 nm, and the wall thickness is 100-200 nm.

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Abstract

The invention discloses hexagonal tubular carbon nitride as well as a preparation method and application thereof. The preparation method comprises the following steps: heating a nitrogen-containing organic precursor to 450-600 DEG C and calcining to obtain bulk carbon nitride; dispersing the bulk carbon nitride in water, and performing a hydrothermal reaction at 150-200 DEG C to obtain floc; heating the floc to 450-750 DEG C and calcining to obtain the hexagonal tubular carbon nitride. The method disclosed by the invention has the advantages of simplicity and easiness in implementation, low price and high repeatability and is of great enlightening significance to the synthesis of a tubular material. The hexagonal tubular carbon nitride disclosed by the invention has a special morphology with great innovativeness while the size distribution is uniform; compared with traditional two-dimensional morphology such as carbon nitride nano sheet, the hexagonal tubular carbon nitride has a larger specific surface area and is beneficial to providing more active sites and improving the reaction activity. In terms of hydrogen production through visible light photocatalysis, the hexagonal tubular carbon nitride has relatively excellent photocatalysis property that common flaky carbon nitride can never achieve.

Description

technical field [0001] The present invention relates to a carbon nitride with a special microscopic appearance, specifically to a hexagonal tubular carbon nitride and its preparation method, and also to the application of the hexagonal tubular carbon nitride as a visible light photocatalytic hydrogen production catalyst, which belongs to semiconductor Materials and their preparation technologies. Background technique [0002] As an organic semiconductor, carbon nitride is an excellent photocatalyst due to its relatively suitable band gap structure (~2.7eV). In recent years, people have continuously modified it, including ion doping, heterojunction, and changing the shape. Comparing a series of documents, it can be found that the tubular carbon nitride material has the most excellent visible light photocatalytic hydrogen production properties. This is mainly due to the fact that the existence of the tube shape facilitates the movement of electrons along the tube axis, there...

Claims

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Application Information

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IPC IPC(8): C01B21/082C01B3/02B01J27/24B01J35/10B01J35/02
CPCB01J27/24B01J35/004B01J35/02B01J35/1019C01B3/02C01B21/0605C01P2004/11C01P2004/61C01P2004/62C01P2006/12
Inventor 杨萍江志翔
Owner UNIV OF JINAN
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