Nitrogen-doped hollow carbon sphere as well as preparation method and application thereof

A technology of nitrogen-doped and carbon spheres, applied in the field of nitrogen-doped hollow carbon spheres and its preparation, can solve the problems of complex synthesis process, high cost, and limited application, and achieve uniform particle size, low cost, and high-efficiency selectivity trapping effect

Inactive Publication Date: 2021-01-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a nitrogen-doped hollow carbon sphere and its preparation method and application in order to solve the technical problems of high cost, complex synthesis process and limited application of the carbon dioxide capture solid adsorbent in the prior art

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  • Nitrogen-doped hollow carbon sphere as well as preparation method and application thereof
  • Nitrogen-doped hollow carbon sphere as well as preparation method and application thereof
  • Nitrogen-doped hollow carbon sphere as well as preparation method and application thereof

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preparation example Construction

[0036] The preparation method of nitrogen-doped hollow carbon spheres of the present invention comprises the following steps:

[0037] Step 1, adding ammonia water to the mixed solvent of ethanol and deionized water, stirring evenly to obtain a mixed solution;

[0038] Step 2. Under continuous stirring, add tetraethyl orthosilicate into the mixture, add resorcinol after 5-15 minutes, add formaldehyde after 5-15 minutes, add urotropine after 5-15 minutes, and stir evenly , solidified, centrifuged, washed, and vacuum-dried to obtain a brown polymer;

[0039] Step 3, under the protection of an inert gas, carbonize the brown polymer to obtain silica core carbon spheres;

[0040] Step 4. Under the protection of an inert gas, mix the silicon dioxide core carbon spheres with potassium hydroxide, etch, pickle, water wash, and vacuum dry to obtain etched silicon dioxide core carbon spheres;

[0041] Step five, use g-C 3 N 4 Activate the etched silicon dioxide core carbon spheres an...

Embodiment 1

[0055] 1.6 mL of ammonia solution (25 wt %) was added to a mixed solvent of ethanol (26.6 mL) and deionized water (13.3 mL), and stirred at 30° C. at a stirring speed of 600 rpm for 30 min to obtain a mixed solution.

[0056] Under continuous stirring at 600rpm, add 1.4mL TBOT to the mixture, add 0.2g resorcinol after 10min, add 0.28mL formaldehyde after 10min, add 0.075g HMTA after 10min, stir at 600rpm at 30°C for 24h, transfer to an autoclave, hydrothermally treated at 100°C for 24 hours, centrifuged to collect the product, washed with a large amount of ethanol and deionized water until neutral, and dried overnight at 80°C under vacuum to obtain a brown polymer with a silica core and polymer shell structure matter (SiO 2 @RF).

[0057] Under nitrogen protection, the SiO 2 @RF was heated to 700 °C for 1 h at a heating rate of 5 °C / min for carbonization to obtain silica@carbon core-shell nanostructures.

[0058] Fully mix silica@carbon sphere-shell nanostructures with anhy...

Embodiment 2

[0061] 0.8 mL of ammonia solution (25 wt %) was added to a mixed solvent of ethanol (13.3 mL) and deionized water (6.65 mL), and stirred at 30° C. at a stirring speed of 600 rpm for 20 min to obtain a mixture.

[0062] Under continuous stirring, add 0.7mL TBOT into the mixture, add 0.1g resorcinol after 10min, add 0.14mL formaldehyde after 10min, add 0.037g HMTA after 10min, stir magnetically at 600rpm at 30°C for 24h, transfer to an autoclave, and hydrothermally treated at 100°C for 24h, the product was collected by centrifugation, washed with ethanol and deionized water until neutral, and then dried overnight at 80°C under vacuum to obtain a silica core and polymer shell structure Brown polymer (SiO 2 @RF).

[0063] Under nitrogen protection, the SiO 2 @RF was heated to 700 °C for 1 h at a heating rate of 5 °C / min to obtain a silica @ carbon core-shell nanostructure.

[0064] Fully mix silica@carbon spheres with anhydrous KOH at a mass ratio of 1:1, and carbonize at 1 °C / ...

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Abstract

The invention relates to nitrogen-doped hollow carbon spheres as well as a preparation method and application thereof, and belongs to the technical field of organic/inorganic hybrid materials. The technical problems that in the prior art, a carbon dioxide capture solid adsorbent is high in cost, complex in synthesis process and limited in application are solved. The nitrogen-doped hollow carbon spheres are prepared by the following steps: coating silicon dioxide nanospheres with nitrogen-containing resorcinol formaldehyde resin, carbonizing to obtain silicon dioxide core carbon spheres, enhancing the porosity by KOH and g-C3N4, carrying out nitrogen-doped activation to obtain activated silicon dioxide core carbon spheres, and removing silicon cores by HF. The nitrogen-doped hollow carbon spheres are uniform in particle size, have a unique hollow structure, a large BET surface area and graded porosity, rich pyridine N sites are exposed on a carbon shell, accessibility of nitrogen sitescan be enhanced, mass migration of objects is facilitated, interaction force between the nitrogen-doped hollow carbon spheres and CO2 gas is facilitated, and the nitrogen-doped hollow carbon spheres have efficient selective capture on CO2 in multi-element gas.

Description

technical field [0001] The invention belongs to the technical field of organic / inorganic hybrid materials, and in particular relates to a nitrogen-doped hollow carbon sphere and its preparation method and application. Background technique [0002] With the continuous development of national science and technology and the continuous improvement of environmental protection requirements, carbon dioxide (CO 2 ) emission control has become an inevitable problem in industrial production process and global energy utilization. The greenhouse effect is one of the most serious problems facing mankind today, with potentially destructive environmental impacts. The continuous accumulation of carbon dioxide in the atmosphere is the main "contributor" to the greenhouse effect. Carbon dioxide emissions are mainly unavoidably produced by the combustion of fossil fuels in industry, so controlling and reducing carbon dioxide emissions has become a crucial task in academia and industry. To t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05B01D53/02
CPCB01D53/02B01D2257/504C01B32/05Y02P20/151Y02C20/40
Inventor 于洋田龙
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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