Aspen sawdust is used as a precursor to prepare active carbon,and the effects of different CO2 concentrations on the spe-cific surface area,pore volume,adsorption properties of activated carbon and the yield of activated carbon were investigated. The re-sults showed that the specific surface area of activated carbon represents increase first and then decrease with increasing the concen-tration of CO2. Furthermore,the microporous and mesoporous ratio of the preparation activated carbon showed the same trend with increasing the concentration of CO2 . Textural properties of activated carbon have a maximum value when the addition of CO2 is 80%. That is,the specific surface area is 693 cm2 ·g-1 and the micro porosity is above 88%.%以废杨木木屑为原料,使用CO2作为活化剂制备活性炭.考察了不同CO2浓度对活性炭的比表面积、孔容积、活性炭得率及吸附性能的影响.研究表明,活性炭的比表面积随着CO2浓度的增加是呈现先增加后减小的趋势,同样,随着CO2浓度的逐渐增加,活性炭的微孔和中孔的比例也呈现出先增加后减小的趋势,在CO2浓度为80%时存在最大值,最大值为693 cm2·g-1,微孔率达到88%以上.
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