二步炭化制备高活性木炭的特性表征

Characterization of Highly-activated Wood Charcoal Prepared from Two-step Carbonization

500℃下炭化杉木屑，再以此炭化料作为原料，在900℃下进行第二步炭化，制得高活性木炭。通过N2吸附等温线、杜比宁方程（DR）、BJH理论对二步炭化法制备的活性木炭的特性进行表征。结果表明，二步炭化法较大程度上提高了木炭的比表面积；随着炭化保温时间的延长，活性木炭的比表面积、总孔容积、微孔容积、中孔容积均呈上升趋势；二步炭化法可以制备孔径相对集中的活性木炭，孔径大部分集中在0．6-2，0nm。在900℃，6h保温条件下，二步炭化法所制得高活性木炭的比表面积为1288．36m。／g，总孔容积为0．784mL／g，微孔容积为0．407mL/g，中孔容积为0．377mL／g。

Chinese fir （Cunninghamia latweolata） wood powder was carbonized at 500 ℃ in the first step, followed by the second step of carbonization using wood charcoal as the raw material at 900 ℃ to obtain highly-activated charcoal. The results showed that activation occurred in the second carbonization step. N2-adsorption isotherm data and mathematical models such as the DR equation and BJH methods were used to characterize the properties of the produced wood charcoal. Results of sin-face analysis showed that two-step carbonization can remarkably increase the surface area of the charcoal. It was found that surface areas, total pore volume,microporous and mesoporous volumes were increased with increasing of carbonization time,and most pore diameters were concentrated at 0.6-2.0 nm. At 900 ℃for 6 h, surface area,total pure vohune,microporous and mesoporous volumes were 1 288.36 m^2/g,0. 784 mL/g,0. 407 mL/g,0. 377 mL/g, respectively.