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Preparation method and application of carbon nanotube wrapped nitrogen-doped porous carbon composite material

A technology of nitrogen-doped porous carbon and carbon nanotubes, which is applied in the preparation/purification of carbon, analytical materials, nanotechnology, etc., can solve the problems of narrow linear range, high detection limit, complex preparation process, etc., and achieve electrochemical signal The effect of sensitive response, high accuracy and reproducibility, and high peak resolution

Active Publication Date: 2021-05-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Overcoming the expensive raw materials, complex preparation process, poor dispersion and poor biocompatibility of the existing electrochemical modifiers, the simultaneous determination of ascorbic acid, dopamine and uric acid has a narrow linear range, high detection limit, poor peak resolution and large background current , leading to defects such as low response sensitivity

Method used

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  • Preparation method and application of carbon nanotube wrapped nitrogen-doped porous carbon composite material
  • Preparation method and application of carbon nanotube wrapped nitrogen-doped porous carbon composite material
  • Preparation method and application of carbon nanotube wrapped nitrogen-doped porous carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033](1) Weigh 100 mg carboxylated carbon nanotubes and 2 g of polyvinylpyrrolidone (PVP, WM = 40000) in the beaker, add 200 ml of deionized water, and the magnetic force is stirred after 15 min, washed with ultrapure water and centrifuged 4 times. The activated carbon nanotubes were obtained after drying at 70 ° C in an oven.

[0034](2) Weigh 421mg (1.42 mmol) hexahydrate zinc (Zn (NO)3)2· 6h2O), in a 20 mL methanol solvent, 110 mg of activated carbon nanotubes were added. After stirring for 10 h, it was poured into 8 ml of 873 mg (10.65 mmol) 2-methylimidazole methanol solution, stirred for 5 h. , Was washed with methanol and centrifuged 3 times, and then CNTS @ ziF-8 material was prepared after 30 h at 70 ° C in an oven.

[0035](3) CNTS @ ZIF-8 prepared by step (2) is placed in a porcelain boat, under argon conditions, in the tube furnace in the tube furnace at a heating rate of 5 ° C / min lasts 1.5 h, and the resulting solid The powder was fully impregnated with 40 ml of 1.5 mol / ...

Embodiment 2

[0038](1) Weigh 150 mg of carboxylated carbon nanotubes and 4 g of polyvinylpyrrolidone (PVP, WM = 40000) in the beaker, add 400 ml of deionized water, and the magnetic force is stirred after 25 min, washed with ultrapure water and centrifuged 4 times, The activated carbon nanotube was obtained after drying at 90 ° C in an oven.

[0039](2) Weigh 421mg (1.42 mmol) hexahydrate zinc (Zn (NO)3)2· 6h2O), in a 30 mL methanol solvent, 120 mg of activated carbon nanotubes were added, and after stirring for 12 h, it was poured into 12 ml of 573 mg (10.65 mmol) 2-methylimidazole methanol solution, stir for 6 h. After washing with methanol and centrifuged 3 times, the CNTS @ ziF-8 material was subsequently prepared at 75 ° C in an oven.

[0040](3) Place the CNTS @ ziF-8 prepared by step (2) in a porcelain, under argon conditions, in the tube furnace at a temperature of 5 ° C / min last temperature to 850 ° C for 2.5 h, the resulting solid The powder was fully impregnated with 40 ml of 2.5 mol / L ...

Embodiment 3

[0043](1) Weigh 150 mg of carboxylated carbon nanotubes and 3 g of polyvinylpyrrolidone (PVP, WM = 40000) in the beaker, add 300 ml of deionized water, and the magnetic force is stirred after 20 min, washed with ultrapure water and centrifuged 4 times, The activated carbon nanotubes were obtained after drying at 80 ° C in an oven.

[0044](2) Weigh 421mg (1.42 mmol) hexahydrate zinc (Zn (NO)3)2· 6h2O), in a 25 mL methanol solvent, 115 mg of activated carbon nanotubes were added, and after stirring for 12 h, it was poured into 10 ml of 573 mg (10.65 mmol) 2-methylimidazole methanol solution, stir for 6 h. After washing with methanol and centrifuged 3 times, the CNTS @ ziF-8 material was prepared after 24 h at 80 ° C in an oven.

[0045](3) Place the CNTS @ ziF-8 prepared by step (2) in a porcelain, under argon conditions, in the tube furnace at a temperature of 5 ° C / min last temperature to 900 ° C for 2 h, and the resulting solid powder The aqueous hydrochloric acid placed in 50 ml of 2...

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Abstract

The invention discloses a preparation method and application of a carbon nanotube wrapped nitrogen-doped porous carbon composite material, belonging to the technical field of inorganic material synthesis. The preparation method is to first activate carbon nanotubes, then use zinc nitrate hexahydrate, 2-methylimidazole and the activated carbon nanotubes to crystallize to form CNTs@ZIF-8 material, and finally high-temperature carbonization is prepared. The method has simple steps, mild reaction conditions, uniform product appearance and stable structure. The composite material uses carbon nanotubes and nitrogen-doped porous carbon matrix materials to form a new type of three-dimensional composite material, which can enhance the electron transfer rate and enrichment rate between the single material electrode surface and the electrolyte, and give full play to both The synergistic effect can improve the electrochemical catalytic oxidation effect of ascorbic acid, dopamine and uric acid, effectively and synchronously separate the three substances, and the detection has a wide linear response range, high sensitivity, repeatability and stability.

Description

Technical field[0001]In the field of synthesis of inorganic material, the invention relates to the preparation method of carbon nanotubes wrapped nitrogen doped porous carbon composite.Background technique[0002]Ascorbic acid (AA) is an important vitamin in human food, involved in human cell division, gene expression, etc., commonly used in the treatment of colds, mental illness, infertility, and even cancer and AIDS. Dopamine (DA) is an important neurotransmitter, which is widely distributed in the nervous system of mammalian brain, and the deletion of dopamine will cause central nervous system disorders, which may result in Parkinson and schizophrenia. mental illness. Uric acid (UA) is the main product of sputum metabolism, and the extreme anomaly of human uric acid can produce several high-haired diseases including gout, hyperuricemia and Leash Ni'an syndrome. These three substances often coexist in organisms, thus developing a simple method to detect AA, DA and UA have great rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/168C01B32/05B82Y30/00G01N27/327
CPCB82Y30/00C01B32/05C01B32/168G01N27/308G01N27/3277G01N27/3278
Inventor 吴芳辉王淼任美娟金晶孙敬舟
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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