Adsorption properties of wood charcoal prepared by a traditional method are investigated by using CO
2 adsorption at 195 K and N
2 adsorption at 77 K, focusing on the effects of the treatment temperature. The amount of CO
2 adsorbed at 195 K and N
2 adsorbed at 77 K increases with treatment temperature. The shape of the N
2 adsorption isotherm indicates that the charcoal is predominantly characterized by micropores with the presences of mesopores, when high treatment temperature is applied. At a low treatment temperature, the ratio of
nCO2 to
nN2 is high, whereas, it approaches to unity at the higher treatment temperature than 773 K. The adsorption of CO
2 at 195 K can be used for surface area measurement, in place of N
2 adsorption at 77 K, for the charcoal treated higher temperature.
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