ZIF-based nitrogen-doped porous carbon material and preparation method thereof

A nitrogen-doped porous carbon, S-NGPC-ZIF-8 technology, applied in the field of material chemistry, can solve the problems of difficult removal of template agents, easy collapse of morphology, and polluting pore expanders.

Active Publication Date: 2019-04-12
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a ZIF-based nitrogen-doped porous carbon material and its preparation method to solve the problems of difficult removal of traditional templates, easy collapse of appearance, and introduction of polluting pore-enlarging agents

Method used

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  • ZIF-based nitrogen-doped porous carbon material and preparation method thereof
  • ZIF-based nitrogen-doped porous carbon material and preparation method thereof
  • ZIF-based nitrogen-doped porous carbon material and preparation method thereof

Examples

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Embodiment 1

[0045] A preparation method of ZIF-based nitrogen-doped porous carbon material, comprising the following steps:

[0046] (1) Configure 0.4mol·L respectively -1 Calcium Chloride (CaCl 2 ) aqueous solution 490mL, 0.4mol L -1 of sodium carbonate (Na 2 CO 3 ) aqueous solution 490mL, 2g L -1 Polyvinylpyrrolidone (PVP) aqueous solution 20mL. Under the temperature condition of 35°C, the three solutions were sealed and stirred evenly; the polyvinylpyrrolidone (PVP) solution was evenly divided into two parts (10mL), and respectively added to CaCl 2 solution and Na 2 CO 3 In the solution, keep stirring in a water bath at 35°C for 30 minutes to make it fully stirred evenly; add CaCl 2 The solution was quickly poured into vigorously stirred Na 2 CO 3 In solution at 600r·min -1 Under the condition of a certain stirring speed, the reaction slurry was suction filtered, washed with absolute ethanol and deionized water, the above operation was repeated three times, and vacuum-dried ...

Embodiment 2

[0055] A preparation method of ZIF-based nitrogen-doped porous carbon material, comprising the following steps:

[0056] Except following change, all the other are the same as embodiment 1. Add 0.1 g zinc nitrate hexahydrate crystals to CaCO 3 @PDA solution, stirred at room temperature for 1 h. Add 0.3 mL of triethylamine to the dimethylimidazole solution, and stir at room temperature for 30 min. The well-mixed dimethylimidazole solution was added dropwise to the CaCO 3 @PDA solution, at room temperature at 550r·min -1 The conditions were stirred for 1h. After the reaction, the slurry was suction filtered, washed with ethanol, and dried under vacuum at 80°C for 5 hours to obtain CaCO 3 @PDA @ZIF-8 composite. Weigh a certain mass of CaCO 3 The @PDA@ZIF-8 sample is placed in a tube furnace and subjected to high-temperature carbonization under the protection of nitrogen. The carbonization conditions are: 5°C min -1 The rate at which CaCO 3 The @PDA@ZIF-8 sample was raise...

Embodiment 3

[0058] A preparation method of ZIF-based nitrogen-doped porous carbon material, comprising the following steps:

[0059] Except following change, all the other are the same as embodiment 2. Weigh a certain mass of CaCO 3 The @PDA sample is placed in a tube furnace and subjected to high-temperature carbonization under the protection of nitrogen. The carbonization conditions are: 5°C min -1 The rate at which CaCO 3 The @PDA@ZIF-8 sample was raised from room temperature to 900 °C, kept at a constant temperature for 2 hours, and then naturally cooled to room temperature. The intermediate product CaO@S-NGPC-ZIF-8 was obtained, which was washed to neutrality with deionized water (the washing procedure was the same as

[0060] Example 1), the ZIF-based nitrogen-doped porous carbon material S-NGPC-ZIF-8 was finally obtained.

[0061] Case Analysis

[0062] Such as figure 1 As shown, the nitrogen-doped porous carbon material S-NGPC-ZIF-8 prepared in Example 1 of the present inven...

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Abstract

The invention discloses a ZIF-based nitrogen-doped porous carbon material and a preparation method thereof. The preparation method comprises the following steps of: loading a polydopamine film by taking solid spherical calcium carbonate as a template agent and a pore expanding agent, growing zeolite imidazole matrix crystal ZIF-8 on the surface through induce to obtain nitrogen-contained precursorCaCO3@PDA@ZIF-8, carbonizing at high temperature and washing with water to obtain the hollow spherical ZIF-based nitrogen-doped porous carbon material S-NGPC-ZIF-8. In the high-temperature carbonization process, the calcium carbonate in the composite material CaCO3@PDA@ZIF-8 not only plays a role in supporting the appearance, but also has a high-efficiency reaming effect due to CO2 released by high-temperature decomposition, and the evaporation of ZIF-8 crystal zinc ions also plays a role in secondary reaming in the pyrolysis process, the method not only solves the problems that a prior template agent is difficult to remove, the appearance is easy to collapse and the like, but also avoids the introduction of a polluting reaming agent.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a ZIF-based nitrogen-doped porous carbon material and a preparation method thereof. Background technique [0002] In recent years, hollow spherical carbon materials have received extensive attention from scholars, mainly for the following two reasons: (1) The porous structure of the hollow spherical shape is conducive to the diffusion of gas, thereby increasing the adsorption rate; (2) The hollow volume inside the spherical shape can adapt to The shrinkage of the volume during the carbonization process has a certain anti-sintering ability. Nitrogen-doped porous carbon material refers to the carbon material obtained by doping nitrogen into the surface or inside of the porous carbon material. Nitrogen doping often improves the surface properties of the carbon material or changes the internal structure of the carbon material, thereby improving the a certain a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05B01J20/20B01J20/28B01J20/30
CPCB01J20/20C01B32/05B01J20/28B01J20/30
Inventor 童张法关浩宇贺鑫廖丹葵崔学民李立硕
Owner GUANGXI UNIV
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