Method for preparing carbon aerogel
A carbon aerogel and wet gel technology, which is applied in the field of carbon aerogel preparation, can solve the problems of gel particle structure collapse, carbon particle size and pore structure damage, etc., achieving a short preparation cycle, saving equipment costs, low cost effect
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Embodiment 1
[0019] 1. Coal tar pitch was used as raw material, and amphiphilic carbon materials were prepared by a common known preparation method. The specific preparation process was as follows: 100 mL of mixed acid (concentrated nitric acid with a mass concentration of 65% and concentrated sulfuric acid with a mass concentration of 98% in a volume ratio of 3 :7 preparation) heated to 80°C, stirred at a stirring rate of 300r / min, added 10g of coal tar pitch, reacted for 1h, poured the reactant into 1L of deionized water to terminate the reaction, filtered with a vacuum filter device, and the obtained filter cake was used Wash with ionic water until neutral; add the obtained solid substance to 500ml of NaOH solution with a concentration of 1mol / L, stir at 80°C at a speed of 300r / min for 1h, filter under reduced pressure, and maintain the pH value of the solution during this process Always greater than 12; collect the filtrate, add 1 mol / L of HCl dropwise in the obtained filtrate, adjust ...
Embodiment 2
[0023] 1. The difference is that the initial raw material is needle coke. The needle coke-based amphiphilic carbon material was prepared according to the method in step 1 of Example 1.
[0024] 2. Get 2g needle-shaped coke-based amphiphilic carbon material prepared in step 1 and mix it with 50ml ethylenediamine, stir at a stirring rate of 300r / min for 0.5 hour to obtain the amphiphilic carbon material solution; pour the amphiphilic carbon material solution into 200ml of acetone, stirred for 15 minutes and then centrifuged to obtain a solid wet gel; put the solid wet gel into 200ml of acetone again and continue to stir for 10h, centrifuged, repeated twice to obtain a wet gel;
[0025] 3. Mix the wet gel obtained in step 2 at 50 o Dry under normal pressure at C to obtain a specific surface area of 59m 2 / g of airgel, carbon gel particle size between 100~150nm; airgel in N 2 Atmosphere with 1 o C / min heating rate up to 600 o C, the carbonization time is 60 minutes, and th...
Embodiment 3
[0027] 1. The difference is that the initial raw material is petroleum coke, and the petroleum coke-based amphiphilic carbon material is prepared according to the method in step 1 of Example 1.
[0028] 2. Get 1.5 g of the petroleum coke-based amphiphilic carbon material prepared in step 1 and mix it with 50 ml of ethylenediamine, stir at a stirring rate of 300 r / min for 0.5 hour to obtain the amphiphilic carbon material solution; pour the amphiphilic carbon material solution into 200ml of acetone, stirred for 15 minutes and then centrifuged to obtain a solid wet gel; put the solid wet gel into 200ml of acetone again and continue to stir for 10h, centrifuged, repeated twice to obtain a wet gel;
[0029] 3. Mix the wet gel obtained in step 2 at 50 o Dry under normal pressure at C to obtain a specific surface area of 73m 2 / g of airgel, carbon gel particle size between 50~100nm; airgel in N 2 Atmosphere with 1 o C / min heating rate up to 700 o C, the carbonization time is...
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