Method for preparing nitrogen self-doped three-dimensional graphene from peels
A self-doping and graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as nitrogen self-doping three-dimensional graphene, etc., to meet sustainable development, reduce costs and prices. low cost effect
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Embodiment 1
[0041] 1) Wash the banana peel and cut into pieces, add water, and react with hydrothermal insulation at 180°C for 12 hours. Rinse the product repeatedly with water and filter to obtain a black gel-like carbide;
[0042] 2) Freeze-drying the gelatinous carbide in step 1) at -60°C and an absolute pressure of 20 Pa for 24 hours to obtain a preliminary carbonized product;
[0043] 3) Mix the preliminary carbonized product in step 2) with the KOH solid in a mass ratio of 1:2 and put it into a ball mill tank, add ethanol to the 3 / 4 position of the ball mill tank, and ball mill on a ball mill at a rate of 500 rpm for 5 hours;
[0044] 4) Dry the ball milled product in step 3) at 120°C until the ethanol is completely volatilized, and then under the protection of Ar gas at 5°C for min -1 The rate of heating up to 800 ℃ for 1h for high temperature activation;
[0045] 5) Put the product obtained in step 4) in 0.5mol.L -1 The unreacted activator and other impurities were removed by acid washing...
Embodiment 2
[0055] 1) Wash the orange peel and cut into pieces, add water, and react with hydrothermal insulation at 180°C for 18h. Rinse the product repeatedly with water and filter to obtain a black gel-like carbide;
[0056] 2) Freeze-dry the gelatinous carbide in step 1) at 0°C and an absolute pressure of 10 Pa for 48 hours to obtain a preliminary carbonized product;
[0057] 3) Combine the preliminary carbonized product in step 2) with K 2 CO 3 The solids are mixed according to the mass ratio of 1:1 and put into the ball milling tank, adding ethanol to the 3 / 4 position of the ball milling tank, and ball milling on the ball mill at a rate of 500 rpm for 5 hours;
[0058] 4) Dry the ball milled product in step 3) at 100°C until the ethanol is completely volatilized, and then under the protection of Ar gas at 5°C for min -1 The rate is increased to 600℃ for 1h for high temperature activation;
[0059] 5) Put the product obtained in step 4) in 0.1mol.L -1 The unreacted activator and other impuri...
Embodiment 3
[0065] 1) Wash the banana peel and cut into pieces, add water, and react under hydrothermal insulation at 190°C for 14 hours. Rinse the product repeatedly with water and filter to obtain a black gel-like carbide;
[0066] 2) Freeze-drying the gelatinous carbide in step 1) at -50°C and an absolute pressure of 50 Pa for 12 hours to obtain a preliminary carbonized product;
[0067] 3) Mix the preliminary carbonized product in step 2) with the NaOH solid in a mass ratio of 1:3 and put it into a ball mill tank, add ethanol to the 3 / 4 position of the ball mill tank, and ball mill on a ball mill at a rate of 500 rpm for 6 hours;
[0068] 4) Dry the ball milled product in step 3) at 120°C until the ethanol is completely volatilized, and then under the protection of Ar gas at 6°C for min -1 The rate of heating is increased to 700°C for 2h for high temperature activation;
[0069] 5) Put the product obtained in step 4) in 0.2mol.L -1 Pickling in sulfuric acid solution at 30°C for 10 hours to re...
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