The specific surface area of micropores in activated carbon accounts for more than 95% of the specific surface area of activated carbon, which largely determines the adsorption capacity of activated carbon. The mesopore specific surface area accounts for about 5% of the activated carbon specific surface area, which is the adsorption site of larger molecules that cannot enter the micropores, and capillary agglomeration occurs under higher relative pressure. The specific surface area of the macropores generally does not exceed 0.5m2/g, which is only the channel through which the adsorbate molecules reach the micropores and mesopores, and has little effect on the adsorption process.