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Spherical mesoporous carbon nitride material and preparation method thereof

A mesoporous and spherical technology, applied in nitrogen and non-metallic compounds, nanotechnology, etc., can solve the problems of limited catalytic performance, small specific surface area, poor porosity, etc., to achieve easy mass transfer, simple preparation process, and wide application. Effect

Active Publication Date: 2013-04-03
泰州市海通资产管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: g-C in the prior art 3 N 4 The material has the defects of small specific surface area and poor porosity, which limits its catalytic performance.

Method used

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  • Spherical mesoporous carbon nitride material and preparation method thereof

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Effect test

Embodiment （ 1

[0022] 10mL of pure TEOS was added to a mixed solution of 100mL of ethanol and 20mL of water, then 10mL of saturated concentrated ammonia water was added, and the mixture was stirred rapidly at room temperature to obtain white SiO 2 Colloidal suspension, centrifuged, washed with water and ethanol, dried to obtain solid SiO with an average particle size of 80 nm 2 Small balls, the intermediate product A.

[0023] Take the above average particle size as 80nm solid SiO 2 Add 0.5g of water, 150mL of water, ultrasonic for 15min, then add 1.0g of cetyltrimethylammonium bromide (CTAB), 300mL of water, 300mL of ethanol, 10mL of saturated concentrated ammonia water, stir for half an hour, then add 5mL of pure TEOS, Continue to stir for 6h, centrifuge the product to obtain intermediate product B; then disperse product B in 100mL aqueous solution, and add 1gNa 2 CO 3 , after stirring for 10 hours, the product was collected by centrifugation, dried at 80°C, and then placed in a muffle ...

Embodiment （ 2

[0026] 2 mL of pure TEOS was added to a mixed solution of 50 mL of ethanol and 5 mL of water, then 1 mL of saturated concentrated ammonia was added, and the mixture was stirred rapidly at room temperature to obtain white SiO 2 Colloidal suspension, centrifuged, washed with water and ethanol, dried to obtain solid SiO with an average particle size of 40 nm 2 Small balls, the intermediate product A.

[0027] Take the above 40nm solid SiO 2Add 0.5g of water, 50mL of water, ultrasonic for 15min, then add 0.2g of cetyltrimethylammonium chloride (CTAB), 100mL of water, 100mL of ethanol, 1mL of saturated concentrated ammonia water, stir for half an hour, then add 0.5mol / L 0.5mL sodium silicate solution, continue to stir for 6h, and centrifuge the product to obtain intermediate product B; then disperse product B in 100mL aqueous solution, and add 0.1gNaHCO under vigorous stirring at 20°C 3 , after stirring for 10 hours, the product was collected by centrifugation, dried at 80°C, and...

Embodiment （ 3

[0030] 5mL pure TEOS was added to the mixed solution of 100mL ethanol and 30mL water, then KOH0.15g was added, and the mixture was stirred rapidly at room temperature to obtain white SiO 2 Colloidal suspension, centrifuged, washed with water and ethanol, dried to obtain solid SiO with an average particle size of 60 nm 2 Small balls, the intermediate product A.

[0031] Take the above 60nm solid SiO 2 Add 0.5g of water, 100mL of water, ultrasonic for 15min, then add 0.75g of cetyltrimethylammonium chloride (CTAC), 150mL of water, 150mL of ethanol, 3mL of saturated concentrated ammonia water, stir for half an hour, then add 2mL of pure TEOS, Continue to stir for 6h, centrifuge the product to obtain intermediate product B; then disperse product B in 100mL aqueous solution, add 0.2g Na 2 CO 3 After stirring for 6 hours, the product was collected by centrifugation, dried at 80°C, and then placed in a muffle furnace in an air atmosphere at 550°C for 5 hours to obtain an intermedi...

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Abstract

The invention provides a spherical mesoporous C3N4 material with a hollow cavity nanostructure and a preparation method thereof. The preparation method comprises the following steps: modifying a nano solid SiO2 spherule to get a solid SiO2 material coated with mesoporous SiO2 on the outer layer, further adding alkali, selectively etching off the inner-layer solid SiO2 to get nano hollow mesoporous SiO2, fully impregnating the nano hollow mesoporous SiO2 in a water solution of a nitrogen-containing precursor, performing centrifugal drying, performing high-temperature roasting in protective gas, and then using hydrofluoric acid to dissolve the SiO2 to get the spherical hollow mesoporous nano C3N4. The prepared product has the specific surface area of 300-800m<2> / g and a cavity capable of loading other materials, is easy to perform mass transfer and can be further widely applied.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, in particular to a spherical mesoporous C 3 N 4 Materials and their preparation methods. Background technique [0002] Carbon nitride is (C 3 N 4 ) is a theoretically calculated and artificially synthesized inorganic compound. In 1989, Cohen and Liu designed β-C3N4 based on the known structure of β-Si3N4. The elastic modulus of β-C3N4 was calculated to be about 410Gpa, which was close to that of diamond. In 1996, Teter and Hemley on C 3 N 4 Calculations were re-performed, speculating that C 3 N 4 There may be five structures, namely α phase, β phase, cubic phase, quasi-cubic phase and graphite-like phase. At room temperature, graphite-like carbon nitride (g-C 3 N 4 ) is the most stable. g-C 3 N 4 It has a graphite-like layered structure with C between the layers 3 N 3 Ring or C 6 N 7 The rings are connected by the terminal N atoms to form a layer of infinitely expandi...

Claims

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Application Information

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IPC IPC(8): C01B21/082B82Y40/00
Inventor 秦勇储富强陶永新孔泳黎珊
Owner 泰州市海通资产管理有限公司
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