Nitrogen-doped carbon nanotube material
A technology for acidifying carbon nanotubes and nanotubes, which is applied to nanocomposite materials and their application fields, can solve the problems of low product utilization rate, complicated and time-consuming operation, low nitrogen doping content, etc., and achieves simplified production process, easy storage, The effect of large specific surface area
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preparation example Construction
[0036] Preparation of acidified carbon nanotubes: put 1g of carbon nanotubes and 200mL of concentrated sulfuric acid into a three-necked flask, ultrasonically disperse evenly, slowly add 60mL of 70% concentrated nitric acid dropwise, reflux and stir at 60°C for 1h, cool naturally to room temperature, add Dilute with a large amount of deionized water, let it stand for stratification, remove the supernatant, and dialyze the black precipitate at the bottom with deionized water to replace the small molecules in it, so that the surface can be balanced, and a long-term stable and uniform dispersion of carbon nanotubes can be obtained. liquid. The carbon nanotube aqueous dispersion is freeze-dried to obtain acidified carbon nanotube powder, which is placed in a desiccator for subsequent use. Its SEM picture is as follows figure 1As shown, the structure of one-dimensional carbon nanotubes can be clearly seen, and the walls of carbon nanotubes after acidification treatment are relativ...
Embodiment 1
[0039] (1) Weigh 1.0 g of acidified carbon nanotubes and disperse them in 20 mL of 37% formaldehyde aqueous solution, place them in an ultrasonic instrument and disperse evenly, and record them as dispersion liquid A.
[0040] (2) Weigh 3.0g of melamine and add it to 40mL of deionized water, place it in an ultrasonic instrument and ultrasonically disperse it evenly, and record it as dispersion liquid B.
[0041] (3) Mix Dispersion A and Dispersion B, raise the temperature of the water bath to 60°C and stir for 10 minutes. Then triethanolamine was added to the reaction solution to adjust the pH value of the reaction solution system to 8.0, and the mixture was uniformly mixed by ultrasonic, then the reaction solution was poured into a high-pressure reactor, and the temperature was raised to 120° C. for 12 hours to react. Suction filtration, vacuum drying to obtain a black solid powder.
[0042] (4) Put the black solid powder obtained in step (3) into a microwave reaction chambe...
Embodiment 2
[0044] (1) Weigh 1.0 g of acidified carbon nanotubes and disperse them in 30 mL of 37% formaldehyde aqueous solution, place them in an ultrasonic instrument and disperse evenly, and record them as dispersion liquid A.
[0045] (2) Weigh 5.0g of melamine and add it to 40mL of deionized water, place it in an ultrasonic instrument and ultrasonically disperse it evenly, and record it as dispersion liquid B.
[0046] (3) Mix Dispersion A and Dispersion B, raise the temperature of the water bath to 60°C and stir for 10 minutes. Then triethanolamine was added to the reaction solution to adjust the pH value of the reaction solution system to 8.0, and the mixture was uniformly mixed by ultrasonic, then the reaction solution was poured into a high-pressure reactor, and the temperature was raised to 120° C. for 12 hours to react. Suction filtration, vacuum drying to obtain a black solid powder.
[0047] (4) Put the black solid powder obtained in step (3) into a microwave reaction chambe...
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