Comparison of Preparation Technology of Bamboo Charcoal

Bamboo charcoals were prepared using one-step or two-step carbonization method under various carbonization temperatures and times. The yield,iodine number and electrical resistivity of the obtained charcoals were measured and their structures were observed by scanning electron microscope (SEM) in order to elucidate the effects of preparation methods on the properties of bamboo charcoal. Results showed that the charcoal yield by the one-step method was higher than that by the two-step method,whereas their iodine number and electrical resistivity were lower. The optimal carbonization temperature and time to prepare bamboo charcoal were 900 ℃ and 4 h,independently of the carbonization method. In this case,charcoal yield,iodine number and electrical resistivity of bamboo charcoal by one-step method and two-step method were 24.37 % and 23.80 %,265 and 364 mg/g,4.37 and 5.17 Ω·cm,respectively.