Method for preparing activated carbon with high-specific surface area
A high specific surface area, activated carbon technology, applied in the direction of chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low adsorption capacity of activated carbon, underdeveloped microporous structure, low specific surface area, etc., to achieve excellent adsorption performance, Easy to operate, high specific surface area effect
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Embodiment 1
[0019] Anthracite is crushed to 100 μm and then dried, then added to 30wt% potassium hydroxide solution and soaked for 10 hours, the weight ratio of the coal-based carbon to potassium hydroxide solution is 1:3, and filtered; the filtered residue is placed in Heating and activating in a muffle furnace, the activation temperature is 720°C, and the time is 80min, then cooled to room temperature to obtain the activated product; the activated product is pickled with dilute hydrochloric acid with a concentration of 3wt%, then washed with water until neutral, and finally passed 200 mesh sieve to obtain activated carbon with a yield of 68%.
[0020] According to the experimental measurement, the specific surface area is 3467m 2 / g, the iodine value is 2835mg / g, and the methylene blue value is 812mg / g.
Embodiment 2
[0022] Anthracite is crushed to 200 μm and then dried, then added to 35wt% potassium hydroxide solution and soaked for 12 hours, the weight ratio of the coal-based carbon to the potassium hydroxide solution is 1:4, and filtered; the filtered residue is placed in Heating and activating in a muffle furnace, the activation temperature is 750°C, and the time is 70min, then cooled to room temperature to obtain the activated product; the activated product is pickled with dilute hydrochloric acid with a concentration of 4wt%, then washed with water until neutral, and finally passed 200 mesh sieves to obtain activated carbon with a yield of 61%.
[0023] According to the experimental measurement, the specific surface area is 3432m 2 / g, the iodine value is 2817mg / g, and the methylene blue value is 835mg / g.
Embodiment 3
[0025] The bituminous coal is crushed to 300 μm and then dried, then added to 40wt% potassium hydroxide solution and soaked for 8 hours, the weight ratio of the coal-based carbon to the potassium hydroxide solution is 1:6, and filtered; the filtered residue is placed in Heating and activating in a muffle furnace, the activation temperature is 780°C, and the time is 60min, then cooled to room temperature to obtain the activated product; the activated product is pickled with dilute hydrochloric acid with a concentration of 5wt%, then washed with water until neutral, and finally passed 200 mesh sieves to obtain activated carbon with a yield of 52%.
[0026] Experimentally measured, the specific surface area is 3500m 2 / g, the iodine value is 2926mg / g, and the methylene blue value is 809mg / g.
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