Method for preparing carbon material with rich mesopores and macropores
A technology of carbonization and carbonization, which is applied in the field of preparation of porous carbon materials, can solve the problems of high cost, environmental pollution, and difficulty in realizing industrialization, and achieve the effect of easy operation and simple method
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Embodiment 1
[0033]Use thermoplastic phenolic resin as a precursor, and nano-ZnO with a particle size of about 100nm as a template, grind the two separately, mix them according to a mass ratio of 40:60, and then add 15% of the mass of phenolic resin as a curing agent hexamethylene Base tetramine, ball milling to mix the three evenly. The mixture was solidified at 250°C for 2h, crushed, placed in a carbonization furnace protected by a nitrogen atmosphere, heated to 800°C, and carbonized at a constant temperature for 1h. After carbonization, soak the carbonized material in 2mol.L -1 hydrochloric acid solution, stirred for 5h to make the remaining CaO and CaCO 3 Completely dissolve, filter, and then rinse repeatedly with deionized water until neutral, dry, porous carbon material, its specific surface area is 650m 2 .g -1 , the pore diameter is dominated by macropores of 80-90nm, accounting for 80% of the total pore volume.
Embodiment 2
[0035] Take 15g of nano-calcium carbonate (average particle size 120nm) and 5g of phenolic resin, mix evenly, press into a disc with a diameter of 20mm at a pressure of 10MPa, add hexamethylenetetramine alcohol solution dropwise to infiltrate, and dry. Heat the mixture at 3°C / min to 225°C and solidify for 90min under a nitrogen atmosphere, then carbonize at 900°C for 1 hour, and cool to room temperature; add distilled water to convert calcium oxide into calcium hydroxide, wash away the calcium hydroxide with hydrochloric acid, Wash with distilled water until there is no chloride ion; dry at 120°C to obtain a macroporous carbon material with a specific surface area of 300m 2 / g, the pore size is mainly distributed around 100nm.
Embodiment 3
[0037] Weigh 10g of furfuryl alcohol, 8g of formaldehyde, 9g of NiO with a particle size of about 5nm, dissolve in 60mL of ethanol, ultrasonicate for 3h, add 2-3 drops of oxalic acid, slowly rise to 60°C and 80°C while stirring, and keep the temperature for 8h respectively , to polymerize furfuryl alcohol. In high purity N 2 Under the protection of , the mixture was heated to 150°C for 3 hours, and then heated to 300°C at 2°C / min. Then the temperature was raised to 850°C, and carbonized at constant temperature for 4 hours. After carbonization, soak the carbonized material in 3moL.L -1 Nitric acid solution, stirred for 6h, then washed with water until neutral, and dried the porous carbon material. Its specific surface area is 790m 2 / g, the pore size is mainly distributed in the range of 3-5nm.
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