Method for preparing activated carbon with high specific surface area hierarchical porous structure
A technology with high specific surface area and graded pores, which is applied in the field of activated carbon preparation, can solve the problems of low preparation efficiency, low mesoporosity, and long pore expansion treatment time, and achieve the effect of large specific surface area, high mesoporosity and simplified process.
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Embodiment 1
[0022] Step (1): dissolve sucrose and potassium hydroxide in water according to the mass ratio of 1:2, heat and stir until viscous; wherein, the temperature of heating and stirring is 70°C; obtain material 1;
[0023] Step (2): Stir the material 1 obtained in step (1) rapidly at 70° C. at 2000 rpm for 0.5 h; obtain material 2 after cooling;
[0024] Step (3): Put the material 2 obtained in step (2) in a high-temperature furnace, and activate it at 750° C. for 0.5 h under the protection of a nitrogen atmosphere; obtain material 3 after cooling;
[0025] Step (4): Add a hydrochloric acid solution with a concentration of 1M to the material 3 obtained in step (3), treat it at room temperature for 1 hour, then heat and stir at 60°C for 5 minutes, then wash with water until the pH is neutral, and then After drying at 100°C for 8 hours, activated carbon with hierarchical pore structure with high specific surface area was obtained.
Embodiment 2
[0027] Step (1): dissolve sucrose and potassium hydroxide in water according to the mass ratio of 1:3, heat and stir until viscous; wherein, the temperature of heating and stirring is 80°C; obtain material 1;
[0028] Step (2): Stir the material 1 obtained in step (1) rapidly at 80° C. at 2500 rpm for 1 hour; obtain material 2 after cooling;
[0029] Step (3): Put the material 2 obtained in step (2) in a high-temperature furnace, and activate it at 800° C. for 1 hour under the protection of a nitrogen atmosphere; obtain material 3 after cooling;
[0030] Step (4): Add 2M hydrochloric acid solution to the material 3 obtained in step (3), treat it at room temperature for 1 hour, then heat and stir at 60°C for 5 minutes, then wash with water until the pH is neutral. After drying at 100°C for 8 hours, activated carbon with hierarchical pore structure with high specific surface area was obtained.
Embodiment 3
[0032] Step (1): dissolve sucrose and potassium hydroxide in water according to the mass ratio of 1:4, heat and stir until viscous; wherein, the temperature of heating and stirring is 85°C; obtain material 1;
[0033] Step (2): Stir the material 1 obtained in step (1) rapidly at 85° C. at 2800 rpm for 1.5 h; obtain material 2 after cooling;
[0034] Step (3): Put the material 2 obtained in step (2) in a high-temperature furnace, and activate it at 900° C. for 2 hours under the protection of nitrogen atmosphere; obtain material 3 after cooling;
[0035] Step (4): Add a hydrochloric acid solution with a concentration of 2M to the material 3 obtained in step (3), treat it at room temperature for 1 hour, then heat and stir at 60°C for 8 minutes, then wash with water until the pH is neutral, and then After drying at 100°C for 8 hours, activated carbon with hierarchical pore structure with high specific surface area was obtained.
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Abstract
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