玉米芯制备高比表面积活性炭的研究

PREPARATION OF ACTIVATED CARBON WITH HIGH SPECIFIC SURFACE AREA FROM CORN COB

以农业废弃物玉米芯为原料,KOH为活化剂,在炭化温度400～600 ℃,KOH与炭化后原料质量比(mKOH/mC)为3:1～5:1,活化温度850 ℃,活化时间为1.2 h条件下,可制得比表面积大于2 700 m2/g的活性炭.活性炭结构具有以微孔为主,孔径分布窄的特征.

A simple,feasible route for utilizing agricultural waste corn cob to prepare activated carbon of high specific surface area has been studied,using KOH as activating agent.The results show that the formation of micro-pore with high specific surface area can be influenced by many factors such as carbonization temperature,heating rate,activating time and the proportion of m (KOH)/m C,the optimal conditions of which are 850 ℃ for activating temperature,450-600 ℃ for carbonization temperature,1.2 h for activating time,3∶1-5∶1 for m (KOH)/m C when the heating rate is 30 ℃/min.In addition,the activating way can also obviously affect the specific surface area of the activated carbon.The structure of activated carbon prepared has narrow pore size distribution and nearly no hysteresis phenomenon is observed.