活化木材陶瓷的制备及其孔隙结构表征

Preparation and pore structure characteration of activated woodceramics

以KOH为活化剂对以松木粉和液化木材为主要原料制备的木材陶瓷进行活化,用低温氮吸附法和扫描电镜(SEM)研究活化温度对其孔隙结构的影响。结果表明:木材陶瓷孔隙为典型的H3型结构,活化处理能够大量增加介孔与微孔,孔径多分布在1.7~2.6 nm,同时部分保留木材天然结构特征;随活化温度的增大,比表面积先增大后减小,孔径呈现先减小后增大的趋势,但活化温度对微孔的孔径影响较小;经过1 300℃活化处理60 min,活化木材陶瓷的比表面积可达1 044.0 m2·g-1。

Woodceramics which was prepared from pine wood powder and liquefied wood as principal raw materials were activated with KOH as activator, and the low-temperature nitrogen adsorption method and scanning electron microscope（SEM） were employed to survey and observe the effects of activating temperature on the pore structure. The results show that the activating treatment can greatly increase the mesopore and micropore. Its pore structure is a typical H3 type, and most pore diameter distributes in 1.7~2.6 nm, and it still keeps the native pore structure of wood. As the activating temperature raise, the special surface area shows increase at first and then decrease, as well as the pore diameter presents the tendency of decrease at first and then increase. But the activating temperature almost has no effects on the pore diameter of micropore. The special surface area can reach 1 044.0 m2·g-1 as the sample deal with 1 300 ℃ activated temperature and 60 min activated time.