高活性木炭的制备与孔结构表征

Preparation of highly activated wood charcoal and characterization of pore structure

介绍了二步炭化法制备高活性木炭工艺。研究了保温时间和温度对活性木炭吸附性能的影响,并通过ESEM和HRTEM等对其孔结构进行表征。结果表明:二步炭化法可很好地提高木炭的性能,可制得孔径主要集中在0.6～2.0nm的活性木炭;随着保温时间延长,活性木炭的比表面积、孔容积均增大。在较佳实验条件下,所制高活性木炭的比表面积、总孔容积和微孔容积分别为1288.4m2/g、0.784mL/g、0.407mL/g。

The two-step heating carbonization process was used to prepare highly activated wood charcoal. The effect of holding time and temperature on the adsorptive properties of activated wood charcoal was discussed. The pore structures of the activated wood charcoal were characterized by means of ESEM and HRTEM. The result showed that two-step heating carbonization process can improve the performance of wood charcoal. It was found that as carbonization holding time increased, the surface area and total pore volume of the samples increased, with pore radius ranging from 0.6 to 2 nm. Under optimized experimental condition, the surface area, total pore volume and micropore volume of the samples were 1288.4 m^2/g, 0.784 mL/g, 0.407 mL/g, respectively.