A kind of rod-like oligomeric carbon nitride and its preparation method and application

A technology of polycarbonitride and carbonitride, which is applied in the field of oligopolycarbonitride and its preparation, can solve the problems of weak light absorption ability, few active sites, difficult to capture bacteria, etc., and achieve low recombination rate and no secondary Secondary pollution, enhance the effect of photocatalytic activity

Active Publication Date: 2021-05-04
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

but g -C 3 N 4 The sheet structure is difficult to effectively capture bacteria, with fewer active sites and weak light absorption

Method used

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  • A kind of rod-like oligomeric carbon nitride and its preparation method and application
  • A kind of rod-like oligomeric carbon nitride and its preparation method and application
  • A kind of rod-like oligomeric carbon nitride and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This example provides a kind of oligomeric carbon nitride, which is prepared through the following steps:

[0050] (1) Weigh 15g of melamine and 5g of silica pellets into a crucible containing 20mL of water, heat and stir for 30min to fully dissolve them, put them into a high-temperature box-type electronic furnace at 500°C for 4h, and then cool naturally to At room temperature, the white solid was collected by triturating.

[0051] (2) Take by weighing 1.5g of the above-mentioned prepared white solid and put it into a 100mL beaker, pour into 25mL of 50% hydrofluoric acid by volume, stir for 60min and wash the product obtained three times with ethanol and deionized water respectively, Then dry in a vacuum oven at 80 °C for 6 h.

[0052] (3) Weigh 400 mg of the product obtained in step (2) into 100 mL of DMSO solution, and stir at 25° C. for 7 days. Use a 10000rcf centrifuge to remove the centrifuged sediment, and then use a 20000rcf centrifuge to wash the obtained mat...

Embodiment 2

[0063] This example provides a kind of oligomeric carbon nitride, which is prepared through the following steps:

[0064] (1) Weigh 15g of melamine and 5.0g of silica pellets into a crucible containing 20mL of water, heat and stir for 30min to fully dissolve them, then put them into a high-temperature box-type electronic furnace at 500°C for 4h, and then cool naturally to room temperature and triturated to collect a white solid.

[0065] (2) Take by weighing 1.5g of the above-mentioned prepared white solid and put it into a 100mL beaker, pour into 25mL of 50% hydrofluoric acid by volume, stir for 60min and wash the product obtained three times with ethanol and deionized water respectively, Then dry in a vacuum oven at 80°C for 6 hours to obtain oligomeric carbon nitride.

[0066] The obtained oligomeric carbon nitride was subjected to XRD analysis, ultraviolet-visible light absorption experiment, SEM test and photocatalytic activity test respectively. XRD analysis results se...

Embodiment 3

[0075] This example provides an oligomeric carbon nitride, the preparation process of which is basically the same as in Example 2, except that the amount of silicon oxide is changed to 0.5g.

[0076] The obtained oligomeric carbon nitride was analyzed by XRD, ultraviolet-visible light absorption experiment and photocatalytic activity test. XRD analysis results see figure 1 b, showing that the obtained oligomeric carbon nitride is a oligomeric carbon nitrogen material. The structure of the ultraviolet-visible light absorption experiment is as follows: Figure 4 As shown, it can be seen that the oligomeric carbon nitride of this embodiment has certain visible light absorption. For photocatalytic activity results see Figure 6 , indicating that the oligomeric carbon nitride of this example has certain photocatalytic activity.

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Abstract

The invention discloses an oligomeric carbon nitride with photocatalytic activity in the visible light band and its preparation method and application. The oligomeric carbon nitride of the invention is rod-shaped with a length of 1-10 microns and a diameter of 100-500 nm. The carbon and The mass ratio of nitrogen was 0.62. The preparation method of oligomeric carbon nitride comprises (1) dispersing melamine and silicon oxide particles in water, placing them in a heating furnace at 450-520 degrees Celsius for roasting, cooling and grinding to obtain solid particles after roasting; (2) The solid particles are mixed and stirred with hydrofluoric acid, then washed and dried under vacuum. The rod-shaped oligomeric carbon nitride visible light catalyst of the invention has good dispersion, low carrier recombination rate, excellent photocatalytic activity and stability, can be recycled, and has good practical application prospects. The preparation method of the oligomeric carbon nitride of the invention is simple and feasible, the raw materials used are simple and easy to obtain, and the price is low, and the production of polluting by-products can be effectively avoided without secondary pollution.

Description

technical field [0001] The invention relates to the field of semiconductor photocatalytic materials, in particular to an oligomeric carbon nitride, a preparation method thereof and an application as a photocatalyst. Background technique [0002] Using semiconductor photocatalysts such as TiO 2 The application of environmental pollution control has attracted more and more attention. However, TiO 2 Because of its wide band gap, it can only be excited by ultraviolet light, which only accounts for a small part of sunlight (less than 5%), and the rapid recombination of photogenerated carriers also makes its quantum efficiency very low. How to obtain visible photocatalysts that can make full use of sunlight, be excited in the visible spectral range, and simultaneously induce the separation of photogenerated carriers has become an important research field. [0003] As an emerging sterilization technology, photocatalytic sterilization can effectively avoid the formation of toxic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24A01N59/00A01P1/00C01B21/082
CPCA01N59/00B01J27/24B01J35/004C01B21/0605C01P2002/72C01P2002/84C01P2004/03C01P2004/04C01P2004/10
Inventor 霍宇凝李蕙帆杨国详杨玉萍邹泉张子平裴文凯李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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