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Mesoporous carbon nitride hollow microspheres and preparation method thereof

A mesoporous and hollow technology, applied in nitrogen and non-metallic compounds, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex preparation process of template agent, long reaction route and harsh reaction conditions, etc. Achieve high practical value, change the length of the reaction route, and simplify the preparation steps.

Inactive Publication Date: 2021-04-16
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Then immerse in the nitrogen-containing precursor in the molten or aqueous solution state, calcined to generate carbon nitride, and etch to remove SiO 2 Finally, a hollow spherical mesoporous carbon nitride is obtained, and the reaction route is long, especially the template preparation process is complicated and the reaction conditions are harsh.

Method used

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  • Mesoporous carbon nitride hollow microspheres and preparation method thereof
  • Mesoporous carbon nitride hollow microspheres and preparation method thereof

Examples

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Embodiment 1

[0017] To 350 mL of deionized water was added 19.6 g of solid cetyltrimethylammonium bromide (CTABr) and 10 g of solid Na 2 SiO 3 , magnetically stirred at 30°C until completely dissolved to obtain a clear solution. Then 35 mL of ethyl acetate was added to the above solution, the mixture was magnetically stirred for 30 s, and left standing at room temperature for 5 h. Then, the reactor was sealed and placed in an oil bath at 90 °C for 50 h. After the reaction, the obtained precipitate is centrifuged and washed three times with water and ethanol respectively, and dried in the air to obtain the silica template agent.

[0018] Mix 8.5g of solid cyanamide with 1.5g of absolute ethanol, stir in a 60°C water bath at 400rpm for 2 minutes, and sonicate for 10min to obtain a clear and uniform cyanamide / ethanol solution, in which the mass fraction of cyanamide is 85%.

[0019] Take 0.5g SiO 2 The template was placed in a vacuum drying oven, vacuumed for 3.5 hours, added to the cyana...

Embodiment 2

[0021]The preparation process of this example is the same as that of Example 1, except that the amount of cetyltrimethylammonium bromide used is changed from the original 19.6g to 4.9g. The pore diameter, specific surface area, and pore volume of hollow spherical mesoporous carbon nitride are shown in Table 1.

Embodiment 3

[0023] The preparation process of this example is the same as that of Example 1, except that the amount of ethyl acetate used is changed from the original 35mL to 15mL. The pore diameter, specific surface area, and pore volume of hollow spherical mesoporous carbon nitride are shown in Table 1.

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Abstract

The invention provides a spherical mesoporous C3N4 material with a hollow cavity structure, and a preparation method thereof. The preparation method comprises the steps: selecting solid silicon dioxide microspheres as a template agent, dissolving cyanamide in ethyl alcohol to serve as a precursor, injecting the template agent into a cyanamide / ethyl alcohol precursor solution, carrying out high-temperature thermal polymerization, and etching with ammonium bifluoride to remove the template agent so as to obtain the hollow microspheres with mesoporous ammoniated carbon as the shell layer and cavities in the middle. According to the invention, the particle specific surface area of the prepared product is 50-200 m<2> / g; and according to the method, a silicon dioxide template with a multistage structure does not need to be prepared, and a hollow structure is obtained only by changing a precursor solution system, so that the synthesis process is simple, reaction steps are few, and the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of mesoporous materials, and in particular relates to a mesoporous carbon nitride hollow microsphere and a preparation method thereof. Background technique [0002] In recent years, g-C 3 N 4 Due to its special semiconductor characteristics, high hydrothermal stability, non-toxicity, and easy preparation, it is used as a new type of non-metallic catalyst in catalytic reactions. For example, (1) organic reactions, which can be directly used as coupling reactions, Friedel-Crafts reactions, oxidation reactions of alkenes and saturated alkenes, alcohol oxidation reactions, CO 2 The catalyst for the activation reaction can also be used as a carrier for reaction catalysts such as selective hydrogenation; (2) Photodegradation of organic pollutants and photolysis of water to produce hydrogen. g-C 3 N 4 The spectral bandwidth of 2.7eV has absorption in the visible region, which is much higher than...

Claims

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Application Information

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IPC IPC(8): C01B21/082B82Y30/00B82Y40/00
Inventor 李健张敏韩林
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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